2018 seminars |

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(Boltzmann lecture) I will address one of the fundamental questions in statistical physics: how to conciliate the laws of quantum mechanics for a macroscopic system — which predict a memory of the initial state of the system — with the familiar irreversible phenomena that bring any extended system to a thermal equilibrium, where all memory of the initial state is lost. I will present a series of new results on cold atom quantum systems made of mixtures of fermions, which lead to a physical phenomenon known as Many Body Localization Transition. Moreover, I will discuss the possibility to realize quantum systems with negative temperature in the laboratory. | ||

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February 20, 2018 11:00 SISSA, Room 128 |
Immanuel Bloch |
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Using Ultracold Quantum Gases to Probe New and Old Frontiers of Statistical Physics |

The Tan’s contact is an ubiquitous quantity in systems with zero-range interactions: it corresponds for example to the average interaction energy, to the weight of the tails of the momentum distribution function at large momenta, to the inelastic two-body loss rate, just to cite a few. We focus on strongly interacting one-dimensional bosons at finite temperature under harmonic confinement. As it is associated to short-distance correlations, the calculation of the Tan’s contact cannot be obtained within the Luttinger-liquid formalism. We derive the Tan’s contact by employing an exact solution at infinite interactions, as well as a local-density approximation on the Bethe Ansatz solution for the homogeneous system and numerical ab initio calculations for finite interactions. In the limit of infinite interactions, we demonstrate its universal properties, associated to the scale invariance of the model. We then obtain the full scaling function for arbitrary interactions. | ||

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February 19, 2018 11:00 ICTP, Stasi Room |
Anna Minguzzi |
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Tan’s contact for a strongly interacting one-dimensional Bose gas in harmonic confinement: universal properties and scaling functions |

In this talk I will discuss the motion of a tracer particle driven by an external constant force through a quiescent lattice gas. Due to the interaction between the tracer and the bath particles, here modelled as an exclusion process, the driven tracer reaches a steady-state when the external force and the friction exerted by the bath balance each other. The steady-state is characterised by a non equilibrium broad inhomogeneity of the bath density surrounding the driven tracer yielding a rich variety of behaviours. I show that depending on the effective dimension of the lattice, the driven tracer exhibits from sub-diffusive to strong super-diffusive transport in the limit of high of bath particles. Moreover, when more than one driven tracers exist, the external and friction forces mediate an anisotropic attractive interacting force between the tracers, leading to the formation of clusters. I will show through numerical results that such scenario extends into continuous-space and continuous-time dynamics. | ||

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February 13, 2018 11:00 SISSA, Room 128 |
Carlos Mejía Monasterio |
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Driven tracer in quiescent baths: anomalous diffusion and induced-interaction |

Irreversibility, which is usually quantified by the entropy production, is one of the most fundamental concepts in thermodynamics, with deep scientific and technological consequences. It is also an emergent concept, that stems from the complex interactions between a system and its environment. However, as will be discussed in this talk, the standard theory of entropy production breaks down in the quantum case, in particular in the limit of zero temperature. Motivated by this, I will present recent results which overcome these difficulties using the idea of phase space entropy measures for bosonic systems. As I will show, our theory not only overcomes the zero temperature limitations but also allows one to extend the results to deal with non-equilibrium reservoirs. As an application, we will consider squeezed thermal baths, which are instance of a grand-canonical Generalized Gibbs Ensemble and therefore allow us to construct an Onsager transport theory, akin to the theory of thermoelectricity. Finally, I will also discuss how entropy production emerges from the perspective of the environment and the system environment correlations. | ||

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February 6, 2018 11:00 SISSA, Room 128 |
Gabriel Landi |
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Measures of irreversibility in quantum phase space |

We present a new method to compute Rényi entropies in one-dimensional critical systems using the mapping of the Nth Rényi entropy to a correlation function involving twist fields in a ℤ_{N} cyclic orbifold. When the CFT describing the universality class of the critical system is rational, so is the corresponding cyclic orbifold. It follows that the twist fields are degenerate: they have null vectors. From these null vectors a Fuchsian differential equation is derived, although this step can be rather involved since the null-vector conditions generically involve fractional modes of the orbifold algebra. The last step is to solve this differential equation and build a monodromy invariant correlation function, which is done using standard bootstrap methods. This method is applicable in a variety of situations where no other method is available, for instance when the subsystem A is not connected (e.g. two-intervals EE). |
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January 30, 2018 11:00 SISSA, Room 128 |
Benoit Estienne |
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Entanglement entropies of 1d critical systems, orbifold and null-vectors |

By the eigenstate thermalization hypothesis (ETH), a highly excited energy eigenstate behaves like a thermal state. It is related to the black hole information paradox by the AdS/CFT correspondence. I will talk about ETH in two-dimensional large central charge CFT and compare the excited state of a primary operator with the thermal state. To define ETH precisely, one needs to know how similar, or equivalently dissimilar, the excited state and thermal state are. I will talk about short interval expansions of the entanglement entropy, relative entropy, Jensen–Shannon divergence. For the canonical ensemble, the excited state and thermal state are the same at the leading order of large central charge and are different at the next-to-leading order. I will also discuss briefly ETH for generalized Gibbs ensemble, and ETH for the descendant excited states. | ||

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January 25, 2018 14:00 SISSA, Room 138 |
Jia-Ju Zhang |
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Eigenstate thermalization hypothesis in two-dimensional large central charge CFT |

In this talk I will motivate the interest for studying SU(N) quantum magnetism, and present three recent results on: i) a microscopic model exhibiting SU(N) chiral spin liquids and their characterization, ii) the phase diagram of SU(N) two-leg spin ladders and iii) finite temperature “phase diagrams” of SU(N) Heisenberg models on two-dimensional lattices. |
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January 23, 2018 11:00 ICTP, Stasi Room |
Andreas Läuchli |
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SU(N) Quantum Magnetism in 1D and 2D |

Recent experiments on large chains of Rydberg atoms [H. Bernien et al., arXiv:1707.04344] have demonstrated the possibility of realizing 1D systems with locally constrained Hilbert spaces, along with some surprising signatures of non-ergodic dynamics, such as persistent oscillations following a quench from the Neel product state. I will argue that this phenomenon is a manifestation of a “quantum many-body scar”, i.e., a concentration of extensively many eigenstates of the system around special many-body states. The special states are analogs of unstable classical periodic orbits in the single-particle quantum scars. I will present a model based on a single particle hopping on the Hilbert space graph, which quantitatively captures the scarred wave functions up to large systems of 32 atoms. These results suggest that scarred many-body bands give rise to a new universality class of quantum dynamics, which opens up opportunities for creating and manipulating novel states with long-lived coherence in systems that are now amenable to experimental study. | ||

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January 16, 2018 11:00 ICTP, Stasi Room |
Zlatko Papic |
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Quantum Many-body Scars and Non-ergodic Dynamics in the Fibonacci Chain |

Strongly correlated quantum systems exhibit a wide range of phases with unconventional behavior. These phases are characterized by non-trivial global entanglement patterns and cannot be described within the Landau paradigm due to their lack of local order parameters. In my talk, I will discuss how quantum information theory allows us to describe such systems in a way which reconciles their global entanglement with a local description, based on the framework of tensor networks. I will show how tensor networks allow to capture both the structure of the physical interactions as well as global topological entanglement within a unified local description, and how this allows us to build a comprehensive framework to study topologically ordered systems and their excitations. I will then discuss applications of this framework: First, I will show how it allows to characterize the precise nature of topological spin liquids; and second, I will discuss how it can be used to explain topological phase transitions driven by anyon condensation through phases in their entanglement, allowing us to devise measurable order parameters for anyon condensation and thus to study topological phase transitions at a microscopic level. | ||

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January 9, 2018 11:00 ICTP, Stasi Room |
Norbert Schuch |
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Topological Order and Tensor Networks: A Local Perspective on Global Entanglement |

2017 seminars |

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December 19, 2017 11:00 SISSA, Room 128 |
Marco Baiesi |
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Entanglement in protein native states |

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December 12, 2017 11:00 ICTP, Stasi Room |
Matteo Polettini |
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Effective thermodynamics for a marginal observer |

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December 5, 2017 11:00 ICTP, Stasi Room |
Achilleas Lazarides |
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Floquet Systems-Ensembles and Order Under Periodic Driving |

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November 28, 2017 12:00 ICTP, Stasi Room |
Alessandro Vezzani |
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Single big jump and probability condensation in correlated random walks: the case of Lévy Lorentz gas |

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November 14, 2016 11:00 SISSA, Room 5 |
Ingo Peschel |
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The Entanglement Hamiltonian of a Free-Fermion Chain | ||

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November 7, 2017 11:00 SISSA, Room 128 |
Maurizio Fagotti |
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Beyond (first-order) generalized hydrodynamics: why? and how!? |

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October 17, 2017 11:00 SISSA, Room 128 |
Sascha Wald |
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Thermalisation and Relaxation of Quantum Systems | ||

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📅 🕓 🚪 |
October 11, 2017 11:00 SISSA, Room 005 |
Juan R. Gomez-Solano |
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Self-propelled colloidal particles in viscoelastic fluids | ||

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October 4, 2017 11:00 SISSA, Room 128 |
Enrique Rico Ortega |
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Exploring SO(3) “Nuclear Physics” with Ultra-cold Gases |

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September 26, 2017 11:00 SISSA, Big Meeting Room |
Alessandro Codello |
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Functional perturbative RG and CFT data in the ε-expansion | ||

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September 18, 2017 11:00 ICTP, Stasi Room |
Markus Müller |
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Creating Cool Quantum Matter by Non-linear Driving |

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September 4, 2017 11:00 SISSA, Room 128 |
Fabian H.L. Essler |
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Quantum Master Equations and Integrability |

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June 6, 2017 11:00 ICTP, Stasi Room |
Pranjal Bordia |
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Many-Body Localization Through the Lens of Ultracold Quantum Gases | ||

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May 23, 2017 11:00 SISSA, Room 138 |
Masud Haque |
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Non-equilibrium dynamics in isolated quantum systems | ||

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May 4, 2017 11:00 SISSA, Room 138 |
P.K. Mohanty |
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Zeroth law in non-equilibrium — a hot needle in water | ||

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May 2, 2017 11:00 ICTP, Stasi Room |
G. Biroli |
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Non-Linear Responses, Soft Modes and the True Nature of Glasses | ||

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📅 🕓 🚪 |
April 27, 2017 15:00 SISSA, Room 138 |
S. Sinha |
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Recent developments in Quantum Chaos | ||

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📅 🕓 🚪 |
April 20, 2017 11:00 SISSA, Room 138 |
A. Bernamonti |
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Heavy–Heavy–Light–Light correlators in Liouville theory | ||

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April 18, 2017 11:00 ICTP, Stasi Room |
R. Moessner |
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Thermodynamics and Order Beyond Equilibrium — The Physics of Periodically Driven Quantum Systems | ||

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April 12, 2017 14:00 SISSA, Room 138 |
F. Galli |
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Entanglement scrambling in 2d CFT | ||

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📅 🕓 🚪 |
April 11, 2017 11:00 SISSA, Room 128 |
G. Santoro |
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Floquet Topological Insulators? A few warnings | ||

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📅 🕓 🚪 |
March 28, 2017 11:00 SISSA, Room 128 |
F.S. Cataliotti |
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Quantum Control on an Atom Chip | ||

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📅 🕓 🚪 |
March 23, 2017 11:00 SISSA, Room 138 |
N. Pranjal |
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Virasoro coadjoint orbits of SYK/tensor-models & Emergent 2-D Quantum Gravity | ||

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March 21, 2017 11:00 ICTP, Stasi Room |
A. Rosso |
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Liouville Field Theory and Log-correlated Random Energy Models | ||

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📅 🕓 🚪 |
March 16, 2017 11:00 SISSA, Room 138 |
A. de Quieroz |
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Dualities and Symmetries in the Entanglement Entropy of Fermionic Chains |

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March 14, 2017 11:00 SISSA, Room 128 |
T. Roscilde |
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Quantum correlations: equilibrium and non-equilibrium aspects | ||

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📅 🕓 🚪 |
February 28, 2017 11:00 SISSA, Room 128 |
I. Lesanovsky |
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Exploring far-from-equilibrium physics of dissipative spin systems with highly excited atoms |

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February 21, 2017 12:00 ICTP, Stasi Room |
S. Ciliberto |
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A Protocol for Reaching Equilibrium Arbitrarily Fast |

📅 🕓 🚪 |
February 2, 2017 14:00 SISSA, Room 128 |
J. Viti |
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📅 🕓 🚪 |
January 26, 2017 11:00 SISSA, Room 128 |
G. Parisi |
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The physics of jamming: a journey from marble pebbles toward scaling invariant field theory | ||

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January 17, 2017 11:00 SISSA, Room 128 |
S. Simon |
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Big Surprises from Small Quantum Hall Droplets | ||

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📅 🕓 🚪 |
January 11, 2017 16:30 SISSA, Room 128 |
N. Defenu |
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Watch online |

2016 seminars |

📅 🕓 🚪 |
November 22, 2016 11:30 SISSA, Room 128 |
M. Serone |
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The Effective Bootstrap |

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November 15, 2016 11:00 SISSA, Room 128 |
G. Mussardo |
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Prime Suspects and Coprime Accomplices: Quantum Tales in Number Theory | ||

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📅 🕓 🚪 |
November 8, 2016 11:00 SISSA, Room 128 |
E. Tartaglia |
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Logarithmic minimal models with Robin boundary conditions | ||

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📅 🕓 🚪 |
October 11, 2016 11:00 SISSA, Room 128 |
M. Mintchev |
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Non-equilibrium quantum transport: quantum heat engines and full counting statistics | ||

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📅 🕓 🚪 |
October 5, 2016 11:00 SISSA, Room 128 |
Huan-Qiang Zhou |
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Fidelity mechanics: analogues of four thermodynamic laws and Landauer’s principle |

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October 4, 2016 11:00 SISSA, Room 005 |
M. Batchelor |
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Free parafermions |

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July 15, 2016 11:00 SISSA, Room 128 |
Z. Zimboras |
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Negativity in free fermion systems | ||

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July 12, 2016 11:00 SISSA, Room 128 |
V. Eisler |
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Universal front propagation in the XY spin chain with domain wall initial conditions | ||

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June 28, 2016 11:00 SISSA, Room 128 |
B. Poszgay |
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Quantum quenches and exact correlations in the Heisenberg spin chains | ||

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June 17, 2016 11:00 SISSA |
A. Lode |
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Fragmentation and correlations of interacting ultracold multicomponent bosons |

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May 26, 2016 11:30 ICTP |
F. Marquardt |
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Light, sound and topology |

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May 24, 2016 11:00 ICTP |
E. Dalla Torre |
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Parametric resonances: from single atoms to many-body systems |

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May 19, 2016 11:00 SISSA, Room 005 |
A. Jakovac |
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Functional renormalization group in fermionic systems | ||

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May 10, 2016 11:30 SISSA, Room 005 |
R. Egger |
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Multichannel Kondo dynamics and Surface Code from Majorana bound states | ||

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May 6, 2016 11:30 SISSA, Room 005 |
A. Fring |
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Non-Hermitian quasi-exactly solvable models of E_{2} Lie algebraic type |
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📅 🕓 🚪 |
May 5, 2016 14:30 ICTP, Stasi Room |
U. Schneider |
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📅 🕓 🚪 |
May 3, 2016 11:00 SISSA, Room 005 |
F. Bouchet |
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Large deviation theory applied to climate physics, a new frontier of statistical physics | ||

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April 28, 2016 11:30 ICTP, Stasi Room |
E. Collini |
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April 28, 2016 11:00 SISSA, Room 005 |
O.A. Castro-Alvaredo |
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Measures of entanglement from quantum field theory methods | ||

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April 26, 2016 11:00 SISSA, Room 005 |
B. Doyon |
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Non-equilibrium energy transport at quantum criticality | ||

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📅 🕓 🚪 |
April 22, 2016 14:00 SISSA, Room 005 |
M. Polini |
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Hydrodynamic transport, laminar flow, and the AdS/CFT viscosity bound in a graphene field effect transistor | ||

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📅 🕓 🚪 |
April 20, 2016 15:30 ICTP, Stasi Room |
A. Varlamov |
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April 15, 2016 14:30 SISSA, Room 005 |
J.M. Stephan |
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Entanglement evolution after inhomogeneous quantum quenches, and the arctic circle | ||

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April 14, 2016 11:30 ICTP, Stasi Room |
A.K. Heidelberg |
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April 12, 2016 11:00 SISSA, Room 005 |
J. Dubail |
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Inhomogeneous quantum systems in 1d: how does one describe them with Conformal Field Theory? | ||

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📅 🕓 🚪 |
March 31, 2016 11:30 ICTP, Stasi Room |
E. Vesselli |
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📅 🕓 🚪 |
March 22, 2016 11:00 SISSA, Room 128 |
J. Kurchan |
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Darwinian versus thermal optimization | ||

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March 18, 2016 15:00 SISSA, Room 005 |
R. Sinha |
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Thermalization with Chemical Potentials, and Higher Spin Black Holes | ||

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March 17, 2016 11:30 ICTP, Stasi Room |
D. Fausti |
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March 15, 2016 11:30 SISSA, Room 005 |
S. Diehl |
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Universal Quantum Physics in Driven Open Many-Body Systems | ||

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📅 🕓 🚪 |
March 8, 2016 11:00 SISSA, Room 005 |
G. Sierra |
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Entanglement over the Rainbow | ||

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March 3, 2016 14:00 SISSA, Room 128 |
C. Maes |
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Driving-induced stability with long-range effects | ||

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February 22, 2016 14:30 ICTP, Stasi Room |
M. Kruger |
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Fluctuation Induced Interactions In and Out of Equilibrium | ||

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February 17, 2016 15:00 ICTP |
I. Carusotto |
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February 16, 2016 11:00 SISSA, Room 128 |
W. Krauth |
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Fast Irreversible Monte Carlo simulations beyond the Metropolis paradigm: Applications to interacting particles and to spin systems | ||

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February 9, 2016 11:00 SISSA, Room 128 |
T. Fokkema |
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Supersymmetric lattice models: the field theory connection | ||

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February 2, 2016 11:00 SISSA, Room 128 |
A. Chiocchetta |
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Short-time universality and aging in isolated quantum systems | ||

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📅 🕓 🚪 |
January 26, 2016 11:00 SISSA, Room 128 |
F. Corberi |
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Condensation of large fluctuations in a statistical system |