PIRSA:C14017 - Emergence in Complex SystemsPODCAST Subscribe to podcast

Emergence in Complex Systems


Collection URL: http://pirsa.org/C14017

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PIRSA:14020134  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Topological phases in graphene
Speaker(s): Zlatko Papic
Abstract: As realized for the first time in 1980s, quantum many-body systems in reduced spatial dimensions can sometimes undergo a special type of ordering which does not break any symmetry but introduces long-range entanglement and emergent excitations that have radically different properties from their orig... read more
Date: 10/02/2014 - 9:45 am

PIRSA:14020126  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Aharonov-Bohm effect in symmetry protected states
Speaker(s): Luiz Santos
Abstract: Symmetry protected topological (SPT) states are generalizations of topological band insulators to interacting systems. They possess a gapped bulk spectrum together with symmetry protected edge states, with no topological order. There has been recently an intense effort to classify SPT states both in... read more
Date: 10/02/2014 - 11:00 am

PIRSA:14020113  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Emergence of p+ip topological superconducting ground state in infinite-U Hubbard model on honeycomb lattice
Speaker(s): Zheng-Cheng Gu
Abstract: In this talk, I will show the emergence of p+ip topological superconducting ground state in infinite-U Hubbard model on honeycomb lattice, from both state-of-art Grassmann tensor-network numerical approach and quantum field theory approach.
Date: 10/02/2014 - 11:45 am

PIRSA:14020114  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Specific heat and ac susceptibility measurements on the Spin Ice, Dy2Ti2O7
Speaker(s): Jan Kycia
Abstract: Some time ago (1999), Dy2Ti2O7, was shown to be a magnetic analog of water ice, and thus dubbed "spin ice". Recently, theories and experiments have developed the perspective of viewing excitations within the low temperature phase of this spin ice as monopoles. I will present early results of specifi... read more
Date: 11/02/2014 - 9:00 am

PIRSA:14020115  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Topological response in gapless systems: from Weyl semimetals to metallic ferromagnets
Speaker(s): Anton Burkov
Abstract: Standard picture of a topologically-nontrivial phase of matter is an insulator with a bulk energy gap, but metallic surface states, protected by the bulk gap. Recent work has shown, however, that certain gapless systems may also be topologically nontrivial, in a precise and experimentally observable... read more
Date: 11/02/2014 - 9:45 am

PIRSA:14020116  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Tuning magnetism and Chern bands in spin-orbit coupled double perovskites
Speaker(s): Arun Paramekanti
Abstract: We show that double perovskites with 3d and 5d transition metal ions exhibit spin-orbit coupled magnetic excitations, finding good agreement with neutron scattering experiments in bulk powder samples. Motivated by experimental developments in the field of oxide heterostructures, we also study double... read more
Date: 11/02/2014 - 11:00 am

PIRSA:14020112  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Fractional Quantum Hall Effect in a curved space
Speaker(s): Pavel Wiegmann
Abstract: We developed a general method to compute the correlation functions of FQH states on a curved space. The computation features the gravitational trace anomaly and reveals geometric properties of FQHE. Also we highlight a relation between the gravitational and electromagnetic response functions. The ta... read more
Date: 11/02/2014 - 11:45 am

PIRSA:14020117  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Geometry of topological matter: some examples
Speaker(s): Duncan Haldane
Abstract: I will look at two cases of the interplay of geometry (curvature) and topology: (1) 3D Topological metals: how to understand their surface "Fermi arcs" in terms of their emergent conservation laws and the Streda formula for the non-quantized anomalous Hall effect. (2) The Hall viscosity tensor in t... read more
Date: 12/02/2014 - 9:00 am

PIRSA:14020127  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Many-body localization: Local integrals of motion, area-law entanglement, and quantum dynamics
Speaker(s): Dmitry Abanin
Abstract: We demonstrate that the many-body localized phase is characterized by the existence of infinitely many local conservation laws. We argue that many-body eigenstates can be obtained from product states by a sequence of nearly local unitary transformation, and therefore have an area-law entanglement en... read more
Date: 12/02/2014 - 9:45 am

PIRSA:14020119  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Geometrical dependence of information in 2d critical systems
Speaker(s): Paul Fendley
Abstract: In both classical and quantum critical systems, universal contributions to the mutual information and Renyi entropy depend on geometry. I will first explain how in 2d classical critical systems on a rectangle, the mutual information depends on the central charge in a fashion making its numerical ext... read more
Date: 12/02/2014 - 11:00 am

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