Name: Bounding Transport and Chaos in Condensed Matter and Holography
Start: 2018-08-20T09:00:00+02:00
End: 2018-09-14T18:00:00+02:00
Location: Nordita, Stockholm

Monday, 20 August 2018

09:30 Registration and coffee
Registration and coffee
09:30 - 11:00
Room: 122:026
11:00 Planckian Bound on the Decay of Simple Operators - Andrew Lucas (Stanford)
Planckian Bound on the Decay of Simple Operators
- Andrew Lucas (Stanford)
11:00 - 12:00
Room: 122:026 I propose a generic Planckian bound on the lifetime of "simple" operators. This is related -- but not identical -- to the Planckian bound on quantum many-body chaos. This proposal reconciles the intuition that quantum dynamics (and chaos) is bounded by the Planckian time scale with the behavior of free theories, disordered metals in the low temperature limit, and disorder-driven metal-insulator transitions.
14:00 Space-Time in the SYK Model - Kenta Suzuki (Ecole Polytechnique)
Space-Time in the SYK Model
- Kenta Suzuki (Ecole Polytechnique)
14:00 - 14:30
Room: 122:026
14:30 Higher-form global symmetry in Theory of elasticity and holographic model with transverse sound - Nick Poovuttikl (Iceland)
Higher-form global symmetry in Theory of elasticity and holographic model with transverse sound
- Nick Poovuttikl (Iceland)
14:30 - 15:00
Room: 122:026
Tuesday, 21 August 2018
11:00 Fine Grained Chaos in AdS2 and AdS3 - Moshe Rozali (UBC)
Fine Grained Chaos in AdS2 and AdS3
- Moshe Rozali (UBC)
11:00 - 12:00
Room: 122:026
14:00 Slow relaxation and diffusion in holographic quantum critical phases - Richard Davison (Harvard)
Slow relaxation and diffusion in holographic quantum critical phases
- Richard Davison (Harvard)
14:00 - 15:00
Room: 122:026 In many-body quantum systems with strong interactions, the timescale governing transport is typically expected to be short and set by the inverse temperature. For example, in many holographic quantum critical phases of matter the thermal diffusivity (in appropriate units) is set by the inverse temperature. However, there are a simple class of such phases where this is not the case. I will discuss these phases and show that they have a collective excitation whose lifetime is parametrically longer than the inverse temperature. The lifetime of this excitation is enhanced due to its sensitivity to an irrelevant deformation, and I will show that it is this lifetime which ultimately governs the thermal diffusivity in these phases.
18:00 Reception
Reception
18:00 - 20:00
Room: 122:026
Wednesday, 22 August 2018
10:00 Origin of macroscopic Thouless (diffusion) time from the underlying quantum mechanics - Anatoly Dymarsky (Kentucky)
Origin of macroscopic Thouless (diffusion) time from the underlying quantum mechanics
- Anatoly Dymarsky (Kentucky)
10:00 - 11:00
Room: 122:026
11:00 Coffe break
Coffe break
11:00 - 11:30
Room: 122:026
11:30 What is a transport coefficient? - Pavel Kovtun (University of Victoria)
What is a transport coefficient?
- Pavel Kovtun (University of Victoria)
11:30 - 12:30
Room: 122:026
Thursday, 23 August 2018
11:00 A theory of reparameterizations for AdS3 gravity - Kristan Jensen (San Francisco State University)
A theory of reparameterizations for AdS3 gravity
- Kristan Jensen (San Francisco State University)
11:00 - 12:00
Room: 122:026
14:00 Locality Bound for Dissipative Quantum Transport - Xizhi Han (Stanford)
Locality Bound for Dissipative Quantum Transport
- Xizhi Han (Stanford)
14:00 - 14:30
Room: 122:026
14:30 Holographic Strange Insulators from Pinning of Spontaneous Superstructures - Alexander Krikun (Leiden University)
Holographic Strange Insulators from Pinning of Spontaneous Superstructures
- Alexander Krikun (Leiden University)
14:30 - 15:00
Room: 122:026 When one considers the interplay between spontaneous and explicit symmetry breaking in finite charge density systems, one can observe the metal-insulator phase transition when the spontaneous superstructure is formed on top of the explicitly broken state. This goes under the name of "pinning of charge density wave" and eventually can lead to the formation of a Mott insulator, when the pinning gets strong. I will discuss the examples of this phenomenon in holographic models with periodic inhomogeneous and helical homogeneous lattices. The insulating state formed in these holographic models turns out to be quite interesting: firstly it is gapless and inherits the scaling features of the near horizon geometry, secondly, it demonstrates strong suppression of conductivity even for weak explicit translational symmetry breaking, which goes beyond the usual picture of the conductivity being governed by the momentum relaxation rate.
Friday, 24 August 2018
11:00 Holographic Fermions in Striped Superconductors - Sera Cremonini (Lehigh University)
Holographic Fermions in Striped Superconductors
- Sera Cremonini (Lehigh University)
11:00 - 12:00
Room: 122:026 In this talk I will discuss a holographic model of a striped superconductor, in which a U(1) symmetry and translational invariance are broken spontaneously at the same time. This construction provides a concrete example of intertwined orders in holography, and realizes certain key features of pair density wave order. I will also examine the behavior of a probe fermion in this background and the formation and evolution of a Fermi surface in the corresponding PDW phase, in the presence of an explicit UV lattice. The structure of the Fermi surface is very sensitive to the strength of the lattice. In particular, strong lattice effects lead to a broadening of the spectral weight peaks and a gradual disappearance of the Fermi surface along the symmetry breaking direction. The resulting Fermi surface appears to consist of detached segments reminiscent of Fermi arcs.
Saturday, 25 August 2018
Sunday, 26 August 2018