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21/01/2013, 10:30
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Prof. Carlos Sa de Melo (Georgia Tech (USA))21/01/2013, 10:50I discuss the creation of parity violating Fermi superfluids in the presence of non-Abelian gauge fields involving spin-orbit coupling and crossed Zeeman fields. I focus on spin-orbit coupling with equal Rashba and Dresselhaus (ERD) strengths which has been realized experimentally in ultra- cold atoms, but also discuss the case of arbitrary mixing of Rashba and Dresselhaus (RD) and...Go to contribution page
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Prof. Chris Pethick (NORDITA)21/01/2013, 13:45
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Prof. Karyn Le Hur (Ecole Polytechnique Palaiseau)21/01/2013, 14:00During the last decade, experiments have established the existence of unconventional states of matter in a variety of low-dimensional quantum systems. This includes equilibrium states characterized by topological properties as well as stationary states in and out of equilibrium situations. In this Talk, we focus on topological phases of matter, their experimental signatures, and...Go to contribution page
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Prof. Georg Bruun (Aarhus University)22/01/2013, 10:00I discuss the existence of long-lived repulsive as well as attractive polarons in a strongly interacting Fermi gas. The energy, lifetime, and quasiparticle residue of the polarons are calculated, and I show show how they accurately describe experimental data. Finally, I discuss possible consequences of these results regarding observing itinerant ferromagnetism in atomic gasesGo to contribution page
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Mr Miikka Heikkinen (Aalto University)22/01/2013, 14:00We investigate exotic paired states of spin-polarized Fermi gases in the dimensional crossover between onedimensional and three-dimensional optical lattices. We compute the finite temperature phase diagram of the system along the dimensional crossover using real-space dynamical mean-field theory in combination with the continuous-time auxiliary field quantum Monte Carlo method. We find...Go to contribution page
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Dr Gergely Szirmai (Wigner Research Centre of the Hungarian Academy of Sciences, Budapest)22/01/2013, 14:30We describe the spin dynamics of the antiferromagnetic Mott insulator ground state of high spin fermions on a 2- dimensional hexagonal lattice. It was pointed out that such multicomponent systems in 1 and 2 dimensions can realize states without breaking the spin rotation symmetry when the number of components is large enough [1-3]. The low energy fluctuations on top of these so...Go to contribution page
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Prof. Achim Scwenk (TU Darmstadt/EMMI)23/01/2013, 10:00
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Dr Adrian Kantian (University of Geneva)23/01/2013, 14:00Advances in cold gases physics are enabling experiments involving the direct manipulation and observation of single- or few-atom mobile impurities [1,2] within a many-body quantum system, a topic of longstanding interest for condensed matter theory, where it is related to studies of e.g. conductivity and the X-ray edge problem. In light of these developments we study the dynamics...Go to contribution page
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Prof. Luca Salasnich (Department of Physics, University of Padova)24/01/2013, 10:00We study theoretically the effects of spin-orbit coupling on a two-spin-component ultracold atomic Fermi gas along the BCS-BEC crossover of a Feshbach resonance. We find that the condensate fraction of Cooper pairs characterizes the crossover better than other quantities, like the chemical potential or the pairing gap. We also find that, due to the spin-orbit coupling, in...Go to contribution page
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Dr Andrea Fischer (University of Cambridge, Cavendish Laboratory)24/01/2013, 10:30We consider a gas of fermionic atoms conned to a quasi- 2D geometry by a strong harmonic confinement potential in the transverse direction. For a two-component population balanced system, we construct a mean field theory for the BCS-BEC crossover, which correctly renormalises the s-wave contact interaction and allows infinitely many harmonic oscillator bands to be taken into...Go to contribution page
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Prof. Jorge Dukelsky (Instituto de Estructura de la Materia. CSIC.)24/01/2013, 14:00The exact solution of the SU(2) pairing Hamiltonian with non-degenerate single particle orbits was introduced by Richardson in the early sixties, although it was recovered in the last decade in an effort to describe the disappearance of superconductivity in ultrasmall grains. Since then it has been widely applied to mesoscopic systems where finite size effects play an important...Go to contribution page
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Dr Jesper Levinsen (University of Cambridge)25/01/2013, 10:00We investigate the three-body properties of two identical "up" fermions and one distinguishable "down" atom interacting in a strongly confined two-dimensional geometry. We compute exactly the atom-dimer scattering properties and the three-body recombination rate as a function of collision energy and mass ratio m_up/m_down. We find that the recombination rate for fermions is...Go to contribution page
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Prof. Nikolaj Zinner (University of Århus)25/01/2013, 10:30The famous prediction of Efimov [1] that an infinitude of three-body bound states appear in shortrange interacting three-dimensional systems when there is a two-body bound state at zero energy has generated a large amount of interest in the cold atomic gas community after its initial observation in 133Cs [2]. The theoretical description of these experiments have thus far used the...Go to contribution page
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Prof. Boris Malomed (Tel Aviv University, Faculty of Engineering, Dept. of Physical Electronics)25/01/2013, 14:00The quantum-mechanical collapse (alias "fall onto the center" of particles attracted by potential -1/r^2) is a well- known issue in the elementary quantum theory. It is closely related to the so-called "quantum anomaly", i.e., breaking of the scaling invariance of the respective Hamiltonian by the quantization. We demonstrate that, in a rarefied gas of quantum particles attracted by...Go to contribution page
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Prof. Frederic Mila (Ecole Polytechnique Federale de Lausanne)28/01/2013, 10:00In this talk, I will review the recent results we have obtained on the SU(N) Heisenberg model of the Mott insulating phase of multi-color ultracold fermionic atoms loaded in optical lattices with various geometries. In 1D, where Quantum Monte Carlo simulations can be performed, we have calculated the correlations as a function of the entropy per site, with the conclusion that the...Go to contribution page
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Prof. Luis Santos (Leibniz Universität Hannover)28/01/2013, 14:00Atoms in optical lattices present exciting possibilities of control and quantum engineering. In this talk I would like to discuss two different scenarios which may be attained within the current state of the art. I will first discuss the case of bosons in zig-zag optical lattices [1], which may be created using superlattice techniques. For the case of unconstrained bosons I will...Go to contribution page
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Prof. Axel Griesmaier (University of Stuttgardt, Germany)29/01/2013, 10:00In my talk I will try to to shine a light on the peculiar stability conditions of dipolar Bose-Einstein condensates trapped in 1D optical lattices. All effects connected with the formation of ordered states in dipolar quantum gases appear close to the border between stability and instability of the trapped gas. These features are mediated by the interplay between short-range and...Go to contribution page
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Prof. Cristiane Morais Smith (Institute for Theoretical Physics, Utrecht)29/01/2013, 14:00During the last years, cold atoms loaded into optical lattices emerged as an ideal playground to emulate condensed matter systems. In this talk, I will first discuss a recently proposed experimental set-up, which allows for the realization of a spin-dependent optical lattice, in which an effective Zeeman coupling can be generated by Raman excitations [1]. The model Hamiltonian is...Go to contribution page
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Prof. Jens Eisert (Freie Universität Berlin)30/01/2013, 11:00Quantum simulators promise to simulate the dynamics of complex quantum systems in a more efficient way than what is classically possible. In this talk, we will elaborate on the question in what sense experiments with ultra-cold atoms in optical lattices can fulfil the promise of being first dynamical quantum simulators truly outperforming classical devices. We will discuss the...Go to contribution page
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Dr Andre Eckardt (MPIPKS Dresden)30/01/2013, 14:00In the last decade there has been considerable progress in the experimental realization of artificial many-body systems made of ultracold neutral atoms in optical lattices potentials. These systems are extremely clean, well isolated from their environment, and highly tunable (also during the experiment). This makes them a flexible platform for engineering many-body quantum physics...Go to contribution page
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Prof. Giuliano Orso (Université Paris Diderot)31/01/2013, 10:00We investigate the formation of bound states made of two interacting atoms moving in a one dimensional quasi-periodic optical lattice. We derive the quantum phase diagram for Anderson localization of both attractively and repulsively bound pairs. We calculate the pair binding energy and show analytically that its behavior as a function of the interaction strength depends...Go to contribution page
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Prof. Andreas Hemmerich (Hamburg University)31/01/2013, 14:00Atoms trapped in optical lattices hold promises as a useful new arena for studying many-body phenomena, possibly providing helpful insights with regard to various incompletely understood condensed matter scenarios. Unfortunately, the shape that bosonic ground-state wavefunctions can take is limited, apparently compromising the usefulness of this approach for bosons. Such...Go to contribution page
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Dr Pietro Massignan (ICFO - Institute of Photonic Sciences)01/02/2013, 10:00A class of gapped many-body systems displays zero- energy (Majorana) quasiparticles with non-Abelian statistics and as a consequence possesses peculiar topological phases [1, 2]. We discuss here how these arise naturally in fermionic superfluids in 2D optical lattices, in two different scenarios which may be soon realized experimentally. In first instance, we show how to create a...Go to contribution page
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Dr Jan Budich (Stockholm University)01/02/2013, 10:30Topological states of matter which can be understood at the level of quadratic Hamiltonians have been in the spotlight of condensed matter physics in recent years and also the cold atoms community is currently developing a major focus on this topic. In this talk, the fundamental notion of topological states of matter is reviewed in an accessible way. Furthermore, some very recent...Go to contribution page
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Dr Giovanni Mazzarella (Università di Padova)01/02/2013, 14:00We consider ultracold and dilute bosonic atoms confined by double-well shaped potentials. By employing the two- site Bose-Hubbard (BH) model as a theoretical tool, we describe the behaviour of such a system both at zero and at finite temperature. The ground-state of the two-site BH Hamiltonian will be studied by analyzing how the inter-atomic interaction affects the quantum...Go to contribution page
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Prof. Gentaro Watanabe (Asia Pacific Center for Theoretical Physics (APCTP))01/02/2013, 14:30Dissipation is typically considered to be a serious enemy to quantum systems as it leads to a rapid decay of the coherence. Surprisingly, however, recent studies show that an appropriately designed coupling between the system and the reservoir can drive the system into a given pure state [1,2]. This opens the way for the use of dissipation in quantum state engineering. Here we...Go to contribution page
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Prof. W. Vincent Liu (University of Pittsburgh)04/02/2013, 10:00An exciting thrust of cold atom research is to explore some unique aspects of such systems that have no prior analogue in electronic solids. An emergent topic along this line is the study of cold atoms coherently excited up to the higher orbital bands of optical lattices in recent experiments, motivated in part by early theoretical proposals. In this talk, I will report in theory...Go to contribution page
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Prof. Tilman Esslinger (ETH, Zürich)04/02/2013, 13:00We report on the observation of short-range quantum magnetic correlations of fermionic atoms in an optical lattice. The key to entering the regime of quantum magnetism is a tunable geometry optical lattice, which allows us to locally redistribute the entropy. When loading a low-temperature two-component gas with repulsive interactions into either a dimerized or anisotropic simple cubic...Go to contribution page
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Prof. Peter Zoller (University of Insbruck)04/02/2013, 15:00Recently, the condensed matter and atomic physics communities have mutually benefited from synergies emerging from the quantum simulation of strongly correlated systems using atomic setups. In the first part of the talk we give an overview of analog and digital quantum simulation with cold atoms in optical lattices and trapped ions. In the second part we discuss possible future...Go to contribution page
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Ms Fernanda Pinheiro (Stockholm University/NORDITA)04/02/2013, 16:20
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Dr Teimuraz Vekua (Leibniz University of Hannover)04/02/2013, 16:50We will discuss possibility of simulating exotic phases of orbitally degenerate frustrated antiferomagnets in cold gases. Two component Fermi gas loaded in the p-bands of the zig-zag type optical lattice can mimic solid state spin-orbital models such as transition-metal oxides with partially filled d-levels, with the interesting advantage of reviving the quantum nature of orbital...Go to contribution page
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Prof. Silke Ospelkaus (Leibniz University Hannover)05/02/2013, 10:00
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Prof. Gediminas Juzeliunas (Vilnius University)05/02/2013, 14:00Over the last several years there has been a substantial increase of interest in artificial gauge fields and spin-orbit coupling for electrically neutral atoms [1–3]. The spin-orbit coupling with equal Rashba and Dresselhaus contributions has been recently implemented experimentally [4]. Here we consider manifestations of such a spin-orbit coupling for scattering of atoms at the...Go to contribution page
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Dr Sukjin Yoon (Asia Pacific Center for Theoretical Physics)05/02/2013, 14:30I will talk about an ongoing project on the non-equilibrium dynamics following a quantum quench in a p-wave superfluid Fermi gas at zero temperature. P- wave superfluid is known to undergo a quantum phase transition from a gapless phase to a gapped phase when the p-wave interaction is tuned from BCS to BEC regime. The dynamics of a polar state (possibly, axial state in the near...Go to contribution page
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Mr Prasanna Venkatesh (McMaster University)05/02/2013, 15:30Quantum particles in a periodic potential subject to an additional linear force undergo Bloch oscillation at a frequency that is directly proportional to the magnitude of the applied force. In this talk I will describe a novel in- situ, non-destructive method to measure the Bloch frequency for a cloud of cold atoms that are confined within the electromagnetic field of a high quality...Go to contribution page
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Prof. Jean Dalibard (Collège de France et Ecole normale supérieure)06/02/2013, 10:00Among the large variety of quantum collective phenomena that one hopes to address with atomic vapours, magnetism is one of the richest. However the quest for the simulation of magnetism immediately raises a challenging question: how can a system of neutral atoms behave as an assembly of charged particles in a magnetic field? The talk will review some promising approaches to answer...Go to contribution page
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Prof. Masahito Ueda (University of Tokyo)06/02/2013, 14:00The second law of thermodynamics presupposes a clear-cut distinction between the controllable and uncontrollable degrees of freedom by means of macroscopic operations. The cutting-edge technologies in quantum information and nanoscience seem to require us to abondon such a working hypothesis in favor of the distinction between the accessible and inaccessible degrees of freedom. In this...Go to contribution page
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Dr Öhberg Patrik (Heriot-Watt University)06/02/2013, 15:30We show how density dependent gauge potentials can be induced in dilute gases of ultracold atoms using light-matter interactions. We study the effect of the resulting interacting gauge theory and show how it gives rise to novel topological states in the ultracold gas. We find in particular that the onset of persistent currents in a ring geometry is governed by a critical number...Go to contribution page
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Prof. Qi Zhou (The Chinese University of Hong Kong)07/02/2013, 10:00The recent realization of synthetic gauge fields for ultra cold atoms provides physicists exciting opportunities to investigate the interplay between two fundamental phenomena in nature, Bose-Einstein condensation and spin-orbit coupling. In this talk, I will discuss a novel effect of spin-orbit coupling in bosonic systems, namely, it can destroy a high-dimensional condensate even at...Go to contribution page
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Dr Marcello Dalmonte (Insbruck)07/02/2013, 10:30Motivated by ground-breaking experimental findings, static gauge potentials and topological phases of matter are currently two of the most intriguing topics in cold atom physics. In the first part of the talk, we will show how topological phases supporting Majorana edge states emerge in simple toy models of fermionic ladders without the need of any additional reservoir by...Go to contribution page
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07/02/2013, 14:00
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Prof. Alexander Altland (Köln Universität)08/02/2013, 10:00We will discuss mechanisms of effective equilibration ('thermalization') for unitary quantum dynamics under conditions of classical chaos. Focusing on the paradigmatic example of the Dicke model, we will explore how a constructive description of the thermalization process is facilitated by the Glauber Q or Husimi function, for which the evolution equation turns out to be of...Go to contribution page
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Prof. Klaus Sengstock (University of Hamburg)08/02/2013, 14:00
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Dr Clement Wong (Utrecht University)08/02/2013, 15:30We study the Hall conductivity in a spin-orbit coupled bosonic Mott insulator. Using a strong-coupling perturbation theory, we show that in the spinful Bose Hubbard model, interactions can induce momentum-space Berry curvature, leading to the anomalous Hall phase. Furthermore, we find that the ground state can in principle support an integer Hall conductivity, i.e., the...Go to contribution page
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Prof. Wilhelm Zwerger (Technische Universität München)11/02/2013, 10:00
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Prof. Massimo Inguscio (University of Florence)11/02/2013, 14:00
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Dr Brandon Anderson (Joint Quantum Institute)11/02/2013, 15:30Isotropic spin-orbit couplings, such as Rashba in two dimensions, have a continuous symmetry that produces a large degeneracy in the momentum-space dispersion. This degeneracy leads to an enhanced density-of-states, producing novel phases in systems of bosonic atoms. This model is idealistic, however, in that the symmetry of the lasers will weakly break the continuous symmetry to a...Go to contribution page
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Dr Konstantin Krutitsky (Universität Duisburg-Essen)11/02/2013, 16:00We have studied the phase diagram of a quasi-two-dimensional interacting Bose gas at zero temperature in the presence of random potential created by laser speckles. The superfluid fraction and the fraction of particles with zero momentum are obtained within the mean-field Gross-Pitaevskii theory and in diffusion Monte Carlo simulations. We find a smooth crossover from the superfluid to...Go to contribution page
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Dr Shaoyu Yin (Department of Applied Physics, Aalto University)12/02/2013, 10:00The temperature dependence of the thermodynamic potential of quantum chromodynamics (QCD), the specific heat, and the quark effective mass are calculated for imbalanced quark matter in the limit of a large number of quark flavors (large-NF), which corresponds to the random-phase approximation. Also a generalization of the relativistic Landau effective-mass relation in the imbalanced...Go to contribution page
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Dr Elife Karabulut (Lund University)12/02/2013, 10:30The high degree of tunability and flexible control are the two important features associated with cold atomic gases, which have so far paved the way for various applications including ow-dimensional systems, confining potentials with different functional forms, multi-component Bose-Einstein condensates (BECs), quantum gases with different inter-particle interactions, etc. Systems...Go to contribution page
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Prof. Stephanie M Reimann (Lund University)12/02/2013, 14:00Cold atom systems offer many possibilities to shape mesoscopic quantum systems with properties that are fundamentally different from semiconductor nanostructures, such as quantum dots and quantum wires with electrons. The talk will provide a review on the many-body physics of these finite-size bosonic or fermionic quantum systems, with focus on the configuration interaction...Go to contribution page
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Dr Omjyoti Dutta (ICFO - The Institute of Photonic Science)12/02/2013, 16:00A natural description of ultracold gases trapped in optical lattices is given by the so-called single-band Hubbard model. We will discuss the additional effects of interaction to induce intra- as well as inter-band scattering to neighbouring sites, which shows up as density dependent correlated tunneling processes. Such processes can spontaneously give rise to various exotic phases....Go to contribution page
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13/02/2013, 10:00
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Prof. Päivi Törmä (Aalto University)13/02/2013, 14:00We propose a mixed-geometry system of fermionic species selectively confined in lattices of different geometry [1]. We investigate how such asymmetry can lead to exotic multiband fermion pairing in an example system of honeycomb and triangular lattices. A rich phase diagram of interband pairing with gapped and gapless excitations is found at zero temperature. We find that the...Go to contribution page
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Dr Reza Bakhtiari (Institut für Theoretische Physik Hamburg)13/02/2013, 15:30We theoretically investigate the thermodynamics of an interacting inhomogeneous two-component Fermi gas in an optical lattice. Motivated by a recent experiment, Science, 327, 1621 (2010), we study the effect of the interplay between thermodynamics and strong correlations on the size of the fermionic cloud. We use dynamical mean-field theory to compute the cloud size, which in the...Go to contribution page
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Prof. Maciej Lewenstein (ICFO, Barcelona)14/02/2013, 10:00I will present an introduction to the theory of quantum link models, a.k.a. gauge magnets, that are particularly suitable for realizations with ultracold atoms. These models provide an alternative to the standard Wilson's method formulation of lattice gauge theories (LGT). I will derive the simplest Hamiltonian for Abelian U(1) LGT and show the simplest SU(2) extension....Go to contribution page
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Dr Daniel Cocks (Goethe University Frankfurt)14/02/2013, 14:00We investigate effects of interactions and trapping in a cold-gas realization of a 2D time-reversal invariant topological insulator. In contrast to solid-state systems, the effects of trapping and the relatively small scale of cold-gas systems can significantly effect the edge states of topological systems. By choosing explicit realizations of the Hofstadter lattice with various...Go to contribution page
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Prof. Uwe Fischer (Seoul National University)14/02/2013, 14:30We argue that forcing an interacting quantum many-body system to reside after a quench far from its equilibrium state, is an important tool to reveal information on the correlations in the initial ground state. We discuss two examples in detail: [1] We investigate the collapse and revival of first-order coherence in deep optical lattices when long-range interactions are turned on and...Go to contribution page
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Dr Stefan Baur (University of Cambridge)14/02/2013, 15:30Ultracold atoms in Raman-dressed optical lattices allow for effective momentum-dependent interactions among single-species fermions originating from short-range s-wave interactions. These dressed-state interactions combined with very flat bands encountered in the recently introduced optical flux lattices push the Stoner instability towards weaker repulsive interactions, making it...Go to contribution page
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Dr Matthew Edmonds (Heriot-Watt University)14/02/2013, 16:00Over the last two decades ultracold atomic gases have formed the basis for a plethora of theoretical and experimental investigations of matter at the nano Kelvin temperature regime. Condensates formed from either bosonic or fermionic matter offer a large degree of experimental control, and as such it is now possible to perform quantum simulations of various physical scenarios envisaged...Go to contribution page
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Prof. Rudi Grimm (University of Innsbruck)15/02/2013, 10:00
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Dr Bruno Julia-Diaz (ICFO - The Institute of Photonic Sciences)15/02/2013, 14:00We employ the exact diagonalization method to analyze the possibility of generating strongly correlated states in two-dimensional clouds of ultracold bosonic atoms which are subjected to a geometric gauge field created by coupling two internal atomic states to a laser beam. Tuning the gauge field strength, the system undergoes stepwise transitions between different ground states, which...Go to contribution page
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Mr Tobias Grass (ICFO - The Institute of Photonic Science)15/02/2013, 14:30Artificial gauge fields for cold atoms are tools for producing topological quantum states. In spinless or spin-polarized systems, cold bosons are known to support the incompressible phases from the Read-Rezayi series, containing also the famous Laughlin and Moore-Read states with anyonic or even non-Abelian quasiparticle excitations. Here we show that in the case of a pseudospin-1/2 Bose...Go to contribution page
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Dr Marcello Dalmonte (Insbruck)Motivated by ground-breaking experimental findings, static gauge potentials and topological phases of matter are currently two of the most intriguing topics in cold atom physics. In the first part of the talk, we will show how topological phases supporting Majorana edge states emerge in simple toy models of fermionic ladders without the need of any additional reservoir by...Go to contribution page
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Dr Marcello Dalmonte (Insbruck)Motivated by ground-breaking experimental findings, static gauge potentials and topological phases of matter are currently two of the most intriguing topics in cold atom physics. In the first part of the talk, we will show how topological phases supporting Majorana edge states emerge in simple toy models of fermionic ladders without the need of any additional reservoir by...Go to contribution page
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Dr Omjyoti Dutta (Institute of Photonic Sciences)A natural description of ultracold gases trapped in optical lattices is given by the so-called single-band Hubbard model. We will discuss the additional effects of interaction to induce intra- as well as inter-band scattering to neighbouring sites, which shows up as density dependent correlated tunneling processes. Such processes can spontaneously give rise to various exotic phases....Go to contribution page
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Prof. Randall Hulet (Rice University)
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Prof. Peter Zoller (University of Innsbruck)
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Prof. Henk Stoof (Utrecht University)Recent advances in the experimental control of ultracold atomic gases have enabled the creation of new phases of matter in strongly interacting imbalanced Fermi gases that have never been observed before. These achievements have led to a series of exciting new developments, because understanding strongly interacting imbalanced Fermi gases is important for many fields of physics,...Go to contribution page
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Dr Shaoyu Yin (Department of Applied Physics, Aalto University)
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Prof. Qi Zhou (The Chinese University of Hong Kong)The recent realization of synthetic gauge fields for ultra cold atoms provides physicists exciting opportunities to investigate the interplay between two fundamental phenomena in nature, Bose-Einstein condensation and spin-orbit coupling. In this talk, I will discuss a novel effect of spin-orbit coupling in bosonic systems, namely, it can destroy a high-dimensional condensate even at...Go to contribution page
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