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Throughout the history of quantum field theory there has been a rich cross-pollination between high energy and condensed matter physics. From the theory of renormalization to the consequences of spontaneous symmetry breaking this interaction has been an incredible fruitful one. In the last decade there has been a strong resurgence of interest in condensed matter systems in the high energy theoretical physics community. With developments in conformal field theories, AdS/CFT, and effective field theory techniques high energy theorists with all kinds of specialist backgrounds are thinking about the diverse behavior exhibited in low energy physical systems. In addition to these general tools, and their accompanying diverse set of applications, an additional major theme for the conference will be hydrodynamic behavior in condensed matter systems. Recently there has been intense theoretical investigation of hydrodynamics general formulation and fundamental bounds on transport coefficients. These efforts have been made all the more relevant with possible realization of hydrodynamic transport in low energy systems such as metals and graphene. Building on the success of the 2014 edition of this workshop, we propose to reinvigorate once again this fruitful collaboration by bringing together like-minded high energy theorists with appropriate condensed-matter theorists and experimentalists to tackle some of the most interesting problems in modern physics.
Registration for this workshop is now closed.
- Michael Blake, Massachusetts Institute of Technology
- Kin Chung Fong, Raytheon BBN, Harvard
- Sera Cremonini, Lehigh University
- Blaise Gouteraux, Stanford University & APC, CNRS Paris
- Diego Hofman, University of Amsterdam
- Leonid Levitov, Massachusetts Institute of Technology
- Hong Liu, Massachusetts Institute of Technology
- Andrew Lucas, Stanford University
- Joseph Maciejko, University of Alberta
- Andrew Mackenzie, Max Planck Institute
- John McGreevy, University of California, San Diego
- Jeffrey Murugan, Institute for Advanced Study
- Alberto Nicolis, Columbia University
- David Poland, Yale University
- Marco Polini, Instituto Italiano de Technolgia
- Subir Sachdev, Perimeter Institute & Harvard University
- Kai Sun, University of Michigan
- Martin Zwierlein, Massachusetts Institute of Technology
- Lasma Alberte, SISSA
- Matteo Baggioli, Universitat Autonoma de Barcelona
- Yoni BenTov, California Institute of Technology
- Michael Blake, Massachusetts Institute of Technology
- Alex Buchel, Perimeter Institute
- Andres Carvajal, Perimeter Institute
- Sera Cremonini, Lehigh University
- Richard Davison, Harvard University
- Luca Delacretaz, Stanford University
- Nima Doroud, University of Cambridge
- Sergei Dubovsky, Perimeter Institute
- Solomon Endlich, Stanford University
- Angelo Esposito, Columbia University
- Kin Chung Fong, Raytheon BBN, Harvard
- Blaise Gouteraux, Stanford University & APC, CNRS Paris
- Sean Hartnoll, Stanford University
- Kurt Hinterbichler, Perimeter Institute
- Diego Hofman, University of Amsterdam
- Bart Horn, University of Texas at Austin
- Anna Karlsson, Stanford University
- David Kubiznak, Perimeter Institute
- Leonid Levitov, Massachusetts Institute of Technology
- Hong Liu, Massachusetts Institute of Technology
- Andrew Lucas, Stanford University
- Joseph Maciejko, University of Alberta
- Andrew Mackenzie, Max Planck Institute
- Dalimil Mazac, Perimeter Institute
- John McGreevy, University of California, San Diego
- Alexander Monin, École Polytechnique Fédérale de Lausanne
- Jeffrey Murugan, Institute for Advanced Study
- Alberto Nicolis, Columbia University
- Riccardo Penco, Columbia University
- Federico Piazza, CPT, Universite' Aix-Marseille
- David Poland, Yale University
- Marco Polini, Instituto Italiano de Technolgia
- Srinivas Raghu, Stanford University
- Ira Rothstein, Carnegie Mellon University
- Subir Sachdev, Perimeter Institute & Harvard University
- Vasudev Shyam, Perimeter Institute
- Julia Steinberg, Harvard University
- Kai Sun, University of Michigan
- Chenjie Wang, Perimeter Institute
- Amanda Weltman, University of Cape Town
- Shuo Yang, Perimeter Institute
- Jiecheng Zhang, Stanford University
- Martin Zwierlein, Massachusetts Institute of Technology
Monday, August 22, 2016
Time |
Event |
Location |
9:00 – 9:30am |
Registration |
Reception |
9:30 – 10:30am |
Alberto Nicolis, Columbia University |
Bob Room |
10:30 – 11:15am |
Coffee Break |
Bistro – 1st Floor |
11:15 – 12:15pm |
Martin Zwierlein, Massachusetts Institute of Technology |
Bob Room |
12:15 – 2:15pm |
Lunch |
Bistro – 1st Floor |
2:15 – 3:15pm |
John McGreevy, University of California, San Diego |
Bob Room |
3:15 – 4:00pm |
Coffee Break |
Bistro – 1st Floor |
4:00 – 5:00pm |
Sera Cremonini, Lehigh University |
Bob Room |
Tuesday, August 23, 2016
Time |
Event |
Location |
9:30 – 10:30am |
Leonid Levitov, Massachusetts Institute of Technology |
Bob Room |
10:30 – 11:15am |
Coffee Break |
Bistro – 1st Floor |
11:15 – 12:15pm |
Kin Chung Fong, Raytheon BBN, Harvard University |
Bob Room |
12:15 – 2:15pm |
Lunch |
Bistro – 1st Floor |
2:15 – 3:15pm |
Michael Blake, Massachusetts Institute of Technology |
Bob Room |
3:15 – 4:00pm |
Coffee Break |
Bistro – 1st Floor |
4:00 – 5:00pm |
Jeff Murugan, Institute for Advanced Study |
Bob Room |
Wednesday, August 24, 2016
Time |
Event |
Location |
9:30 – 10:30am |
Andrew Mackenzie, Max Planck Institute |
Bob Room |
10:30 – 11:15am |
Coffee Break |
Bistro – 1st Floor |
11:15 – 12:15pm |
Student Talks Luca Delacretaz, Stanford University Angelo Esposito, Columbia University Matteo Baggioli, Universitat Autonoma de Barcelona |
Bob Room |
12:15 – 2:15pm |
Lunch |
Bistro – 1st Floor |
2:15 – 3:15pm |
Joseph Maciejko, University of Alberta |
Bob Room |
3:15 - 3:20pm |
Conference Photo |
TBA |
3:20 – 4:00pm |
Coffee Break |
Bistro – 1st Floor |
4:00 – 5:00pm |
Andrew Lucas, Stanford University |
Bob Room |
Thursday, August 25, 2016
9:30 – 10:30am |
Subir Sachdev, Harvard University |
Bob Room |
10:30 – 11:15am |
Coffee Break |
Bistro – 1st Floor |
11:15 – 12:15pm |
Marco Polini, Instituto Italiano de Technolgia |
Bob Room |
12:15 – 2:15pm |
Lunch |
Bistro – 1st Floor |
2:15 – 3:15pm |
Hong Liu, Massachusetts Institute of Technology |
Bob Room |
3:15 – 4:00pm |
Coffee Break |
Bistro – 1st Floor |
4:00 – 5:00pm |
Diego Hofman, University Amsterdam |
Bob Room |
6:00pm |
Banquet |
Delta |
Friday, August 26, 2016
9:30 – 10:30am |
Blaise Gouteraux, Stanford University & APC, CNRS Paris |
Bob Room |
10:30 – 11:00am |
Coffee Break |
Bistro – 1st Floor |
11:00 – 12:00pm |
Kai Sun, University of Michigan |
Bob Room |
12:00 – 1:30pm |
Lunch |
Bistro – 1st Floor |
1:30 – 2:30pm |
David Poland, Yale University |
Bob Room |
2:30 – 2:40pm |
Closing Remarks |
Bob Room |
Matteo Baggioli, Universitat Autonoma de Barcelona
Jogging Through Holographic Massive Gravity
We present some recent developments in the framework of holographic (Lorentz violating) massive gravity.
We rigorously define the most generic isotropic setup in 3+1 dimensions and we study in detail its phenomenology.
We describe the electric and the viscoelastic responses of the system and we comment on the fate of the KSS viscosity bound in absence of translational symmetry. We conclude with some discussion hints and comments for the future.
Michael Blake, Massachusetts Institute of Technology
Universal Diffusion and the Butterfly Effect
In 2014 Hartnoll proposed that the diffusion constants of incoherent metals should be bounded as $ D \geq \hbar v^2/ (k_B T)$, where v is a characteristic velocity. In this talk I will describe a large class of holographic theories that saturate such a bound, with $v$ being the velocity of the butterfly effect. Our results suggest a novel connection between transport at strong coupling and the field of quantum chaos.
Sera Cremonini, Lehigh University
Scaling geometries and DC conductivities
Luca Delacretaz, Stanford University
Hydrodynamic theory of fluctuating stripes
I will present a hydrodynamic description of matter in a charge density wave (or "smectic") phase. As in superfluids, the spontaneous breaking of a continuous symmetry -- here translations in one direction -- adds a Goldstone phase to the usual long lived hydrodynamic variables. This phase propagates as a highly anisotropic "second sound" mode at low energies, affecting properties such as transport. Phase fluctuations, due to proliferating dislocations, give a finite life-time to certain collective modes, which can be experimentally probed e.g. by measuring ultrasound attenuation. Using the memory matrix, the hydrodynamic approach predicts sound attenuation to be proportional to the shear viscosity of the normal (non-smectic) state.
Angelo Esposito, Columbia University
First sound of zero temperature holographic superfluids
Within the context of AdS/CFT, the gravity dual of an s-wave superfluid is given by scalar QED on an asymptotically AdS spacetime. While this conclusion is vastly based on numerical arguments, I will provide an analytical proof that this is indeed the case. In particular, I will present a technique which allows to explicitely compute the low-energy effective action for the boundary theory starting from the bulk system. This will be done for an arbitrary number of dimensions and an arbitrary potential. I will recover the known dispersion relation for conformal first sound.
Blaise Gouteraux, Stanford University & APC, CNRS Paris
Hydrodynamic theory of quantum fluctuating superconductivity
A hydrodynamic theory of transport in quantum mechanically phase-disordered superconductors is possible when supercurrent relaxation can be treated as a slow process. We obtain general results for the frequency-dependent conductivity of such a regime. With time-reversal invariance, the conductivity is characterized by a Drude-like peak, with width given by the supercurrent relaxation rate. Using the memory matrix formalism, we obtain a formula for this width (and hence also the dc resistivity) when the supercurrent is relaxed by short range Coulomb interactions. This leads to a new -- effective field theoretic and fully quantum -- derivation of a classic result on flux flow resistance. With strong breaking of time-reversal invariance, the optical conductivity exhibits what we call a `hydrodynamic supercyclotron' resonance. We obtain the frequency and decay rate of this resonance for the case of supercurrent relaxation due to an emergent Chern-Simons gauge field. The supercurrent decay rate in this `topologically ordered superfluid vortex liquid' is determined by the conductivities of the normal component of the liquid. Our work gives a controlled framework for low temperature metallic phases arising from phase-disordered superconductivity.
Diego Hofman, University of Amsterdam
Generalized Global Symmetries and Magnetohydrodynamics
I will discuss a global symmetry approach to constructing the most general effective field theory of magnetohydrodynamics.
Leonid Levitov, Massachusetts Institute of Technology
Viscous Electron Fluids: Higher-Than-Ballistic Conduction Negative Nonlocal Resistance and Vortices
Hong Liu, Massachusetts Institute of Technology
Effective field theory of dissipative fluids
Andrew Lucas, Stanford University
Hydrodynamic theory of transport in Dirac and Weyl semimetals
I will discuss recent progress in understanding the consequences of hydrodynamic electron flow on measurable transport properties of metals, focusing on metals where the electrons behave as a charge neutral relativistic plasma. In graphene, I will connect our theoretical models with experimental data and show how we can explain features of transport in graphene that are inconsistent with quasiparticle transport. I will then discuss the extension of these results to Weyl semimetals, which are modeled by a system of multiple chiral fluids. Negative magnetoresistance can occur in both electric and thermal transport; the latter is a consequence of a distinct axial-gravitational anomaly. Future transport experiments on Weyl semimetals can discover this exotic type of anomaly in the lab.
Joseph Maciejko, University of Alberta
Superconducting quantum criticality of Dirac fermions
The semimetal-superconductor quantum phase transition of 2D Dirac fermions, such as found on the surface of a topological insulator, is conjectured to exhibit an emergent N=2 supersymmetry, based on a one-loop renormalization group analysis. In this talk I will present further evidence for this conjecture based on a three-loop analysis. Assuming the conjecture is true, I will present exact results for certain critical properties including the optical conductivity, shear viscosity, and entanglement entropy at zero temperature, as well as the finite-temperature optical conductivity.
John McGreevy, University of California, San Diego
Hierarchical growth of entangled states
Jeffrey Murugan, Institute for Advanced Study
Particle-Vortex duality and Topological Quantum Matter
David Poland, Yale University
Bootstrapping 3D CFTs
I will review recent results from applying the conformal bootstrap to 3D CFTs, including precise determinations of critical exponents and in the 3D Ising and O(N) vector models, new constraints on 3D Gross-Neveu models, and general bounds on correlation function coefficients of currents and stress tensors.
Marco Polini, Instituto Italiano de Technolgia
Hydrodynamic electron transport in a graphene field effect transistor
Graphene sheets encapsulated between crystals of hexagonal boron nitride host a unique two-dimensional (2D) electron system, whereby electrons suffer minimal scattering against acoustic phonons and practically no scattering against long-range disorder (unless gated very close to the charge neutrality point) [1-4]. Above liquid nitrogen temperatures, these electron liquids are expected to display local equilibrium enabled by strong electron-electron interactions [5,6] and viscosity-dominated hydrodynamic transport.
Kai Sun, University of Michigan
Universal features of Lifshitz Green’s functions--- from holography and field theory
In this talk, we examine the behavior of the retarded Green’s function in theories with Lifshitz scaling symmetry, both through dual gravitational models and a direct field theory approach. In contrast with the case of a relativistic CFT, where the Green’s function is fixed (up to normalization) by symmetry, the generic Lifshitz Green’s function can a priori depend on an arbitrary function Nevertheless, we demonstrate that the imaginary part of the retarded Green’s function (i.e. the spectral function) of scalar operators is exponentially suppressed in a window of frequencies near zero. This behavior is universal in all Lifshitz theories without additional constraining symmetries. On the gravity side, this result is robust against higher derivative corrections, while on the field theory side we present two z>1 examples where the exponential suppression arises from summing the perturbative expansion to infinite order, as a consequence of the energy-momentum conservation.
Martin Zwierlein, Massachusetts Institute of Technology
Solitons and Spin-Charge Correlations in Strongly Interacting Fermi Gases
Ultracold atomic Fermi gases near Feshbach resonances or in optical lattices realize paradigmatic, strongly interacting forms of fermionic matter. Topological excitations and spin-charge correlations can be directly imaged in real time. In resonant fermionic superfluids, we observe the cascade of solitonic excitations following a pi phase imprint. A planar soliton decays, via the snake instability, into vortex rings and long-lived solitonic vortices.
TBA
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Scientific Organizers:
- Solomon Endlich, Stanford University
- Sean Hartnoll, Stanford University
- Kurt Hinterbichler, Perimeter Institute
- Alberto Nicolis, Columbia University
- Riccardo Penco, Columbia University