Name: Conference on Frontiers in Quantum Gases Liquids and Solids
Start: 2010-08-09T08:00:00+02:00
End: 2010-08-20T17:00:00+02:00
Location: NORDITA

Conference on Frontiers in Quantum Gases Liquids and Solids

from Monday, August 9, 2010 (8:00 AM) to Friday, August 20, 2010 (5:00 PM)

Monday, August 9, 2010

11:00 AM Dr. Barnett, Ryan (Joint Quantum Institute): Quantum dynamics in ferromagnetic and antiferromagnetic condensates
Dr. Barnett, Ryan (Joint Quantum Institute): Quantum dynamics in ferromagnetic and antiferromagnetic condensates
11:00 AM - 12:00 PM
TBA
Tuesday, August 10, 2010

11:00 AM Prof. Dorsey, Alan (University of Florida): Low temperature properties of solid 4He: Supersolidity or quantum "metallurgy"?
Prof. Dorsey, Alan (University of Florida): Low temperature properties of solid 4He: Supersolidity or quantum "metallurgy"?
11:00 AM - 12:00 PM
A "supersolid" is a putative phase of matter possessing the distinguishing property of a solid--a nonzero shear modulus--together with Bose condensation. Numerous experiments over the last six years have yielded hints of supersolid behavior in solid 4^He, but the threads of these investigations have not produced a consistent interpretation. I'll briefly review some of the history of the subject, the recent experimental and theoretical work, and conclude with an overview of my own work on phenomenological modeling of defects in solid 4He.

1:45 PM Prof. Törmä, Päivi (Aalto University): Imbalanced Fermi gases: the FFLO state, polarons, and the Josephson effect
Prof. Törmä, Päivi (Aalto University): Imbalanced Fermi gases: the FFLO state, polarons, and the Josephson effect
1:45 PM - 2:45 PM
In this talk, I will discuss three topics. First, the FFLO phase in one dimensional optical lattice and a direct way to observe it as narrowing of the hopping modulation spectrum. Second, I discuss our work on polaron-type physics in one dimension where we can explain the results of exact simulations by a polaron ansatz in one the weakly interacting and by a spinless Fermion solution given by the Bethe ansatz in the strongly interacting limit. This corresponds to the polaron-molecule crossover in three dimensions. Finally, I present a novel type of Josephson effect where the components of the Cooper pair feel a different potential (voltage), which is possible to realize in ultracold gases. We show that this leads to spin-asymmetric Josephson oscillations and provide an explanation of this intriguing phenomenon which also gives new information about the traditional Josephson effect.
Wednesday, August 11, 2010

11:00 AM Dr. Parish, Meera (University of Cambridge): Polarons, molecules and trimers in polarized atomic Fermi gases
Dr. Parish, Meera (University of Cambridge): Polarons, molecules and trimers in polarized atomic Fermi gases
11:00 AM - 12:00 PM
In this talk, I will consider an atomic Fermi gas in the limit of extreme spin imbalance, where one has a single spin-down impurity atom interacting attractively with a spin-up atomic Fermi gas. By constructing variational wave functions for polarons, molecules and trimers, I will explore the quantum phase transitions between each of these bound states as a function of mass ratio and interaction strength. I will show that Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing is mostly superceded by the formation of a p-wave trimer, which can be viewed as a FFLO molecule that has bound an additional majority atom. When the mass of impurity atom is sufficiently light, I find that these transitions lie outside the region of superfluid-normal phase separation in spin-imbalanced Fermi gases and should thus be observable in experiment, unlike the well-studied equal-mass case.

1:45 PM Prof. Zwierlein, Martin (Massachusetts Institute of Technology): TBA
Prof. Zwierlein, Martin (Massachusetts Institute of Technology): TBA
1:45 PM - 2:45 PM
TBA
Thursday, August 12, 2010

11:00 AM Prof. Nikolic, Predrag (George Mason University):Unitarity in periodic potentials: a renormalization group analysis
Prof. Nikolic, Predrag (George Mason University):Unitarity in periodic potentials: a renormalization group analysis
11:00 AM - 12:00 PM
We explore the universal properties of interacting fermionic lattice systems, mostly focusing on the development of pairing correlations from attractive interactions. Using renormalization group we identify a large number of fixed points and show that they correspond to resonant scattering in multiple channels. Pairing resonances in finite-density band insulators occur between quasiparticles and quasiholes living at different symmetry-related wavevectors in the Brillouin zone. This allows a BCS-BEC crossover interpretation of both Cooper and particle-hole pairing. We show that in two dimensions the run-away flows of relevant attractive interactions lead to charged-boson-dominated low energy dynamics in the insulating states, and superfluid transitions in bosonic mean-field or XY universality classes. Analogous phenomena in higher dimensions are restricted to the strong coupling limit, while at weak couplings the transition is in the pair-breaking BCS class. The models discussed here can be realized with ultra-cold gases of alkali atoms tuned to a broad Feshbach resonance in an optical lattice, enabling experimental studies of pairing correlations in insulators, especially in their universal regimes. In turn, these simple and tractable models capture the emergence of fluctuation-driven superconducting transitions in fermionic systems, which is of interest in the context of high temperature superconductors.

1:45 PM Prof. Todadri, Senthil (Massachusetts Institute of Technology): Quantum spin liquids and the Mott transition
Prof. Todadri, Senthil (Massachusetts Institute of Technology): Quantum spin liquids and the Mott transition
1:45 PM - 2:45 PM
TBA

5:00 PM

5:00 PM - 7:00 PM
Friday, August 13, 2010

11:00 AM Prof. Ran, Ying (Boston College):TBA
Prof. Ran, Ying (Boston College):TBA
11:00 AM - 12:00 PM
TBA

1:45 PM Prof. Gurarie, Victor (University of Colorado at Boulder):SU(N) magnetism with cold atoms and chiral spin liquids
Prof. Gurarie, Victor (University of Colorado at Boulder):SU(N) magnetism with cold atoms and chiral spin liquids
1:45 PM - 2:45 PM
Certain cold atoms, namely the alkaline earth-like atoms whose electronic degrees of freedom are decoupled from their nuclear spin, can be thought of as quantum particles with an SU(N)-symmetric spin. These have recently been cooled to quantum degeneracy in the laboratories around the world. A new world of SU(N) physics has thus become accessible to experiment, including that described by the SU(N) Hubbard model in various dimensions as well as many others. We show that the Mott insulator of such cold atoms is a SU(N) symmetric antiferromagnet of the type not commonly studied in the literature. We further show that in 2 dimensions, this antiferromagnet is a chiral spin liquid, a long sought-after topological state of magnets, with fractional and non-Abelian excitations.
Saturday, August 14, 2010
Sunday, August 15, 2010