PIRSA:C13019 - Emergence & Entanglement II 2013PODCAST Subscribe to podcast

Emergence & Entanglement II 2013


Collection URL: http://pirsa.org/C13019

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PIRSA:13050021  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
3d boson topological insulators and quantum spin liquids
Speaker(s): Senthil Todadri
Abstract: I will discuss recent work on 3d Symmetry Protected Topological (SPT) phases of bosonic systems, and their implications for understanding the more exotic quantum spin liquid phases. First I will describe various characterizations of these 3d SPT phases, in particular their surface effective theories... read more
Date: 06/05/2013 - 9:05 am

PIRSA:13050022  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
TQFTs and Topological Phases of Matter
Speaker(s): Zhenghan Wang
Abstract: In two spatial dimensions,  there is a good correspondence between TQFTs and topological phases of matter for spin systems.  I will discuss this correspondence in one and three spatial dimensions for spin systems.  If time permits, I will also discuss the situation for fer... read more
Date: 06/05/2013 - 9:45 am

PIRSA:13050023  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Quantum spin liquid phases in the absence of spin-rotation symmetry
Speaker(s): Yong-Baek Kim
Abstract: We investigate possible quantum spin liquid phases in the presence of a variety of spin-rotational-symmetry breaking perturbations. Projective symmetry group analysis on slave-particle representations is used to understand possible spin liquid phases on the Kagome lattice. The results of this analys... read more
Date: 06/05/2013 - 11:00 am

PIRSA:13050024  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Topological Order with a Twist: Ising Anyons from an Abelian Model
Speaker(s): Hector Bombin
Abstract: Anyon models can be symmetric under some permutations of their topological charges. One can then conceive topological defects that, under monodromy, transform anyons according to a symmetry. We study the realization of such defects in the toric code model, showing that a process where defects are br... read more
Date: 06/05/2013 - 11:45 am

PIRSA:13050025  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Emergent Fermionic Strings in Bosonic He4 Crystal
Speaker(s): Ganapathy Baskaran
Abstract: Large zero point motion of light atoms in solid Helium 4 leads to several anomalous properties, including a supersolid type behavior. We suggest an `anisotropic quantum melted' atom density wave model for solid He4 with hcp symmetry. Here, atoms preferentially quantum melt along the c-axis and maint... read more
Date: 06/05/2013 - 2:00 pm

PIRSA:13050026  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Protected edge modes without symmetry
Speaker(s): Michael Levin
Abstract: Some 2D quantum many-body systems with a bulk energy gap support gapless edge modes which are extremely robust. These modes cannot be gapped out or localized by general classes of interactions or disorder at the edge: they are "protected" by the structure of the bulk phase. Examples of this phenomen... read more
Date: 06/05/2013 - 3:15 pm

PIRSA:13050027  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Asymmetry protected emergent E8 symmetry
Speaker(s): Brian Swingle
Abstract: The E8 state of bosons is a 2+1d gapped phase of matter which has no topological entanglement entropy but has protected chiral edge states in the absence of any symmetry.  This peculiar state is interesting in part because it sits at the boundary between short- and long-range entangled phas... read more
Date: 06/05/2013 - 4:00 pm

PIRSA:13050028  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
A 3d Boson Topological Insulator and the “Statistical Witten Effect”
Speaker(s): Matthew Fisher
Abstract: Electron topological insulators are members of a broad class of “symmetry protected topological” (SPT) phases of fermions and bosons which possess distinctive surface behavior protected by bulk symmetries. For 1d and 2d SPT’s the surfaces are either gapless or symmetry broken, while in 3d, gap... read more
Date: 07/05/2013 - 9:00 am

PIRSA:13050029  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Fractionalizing Majorana fermions: non-abelian statistics on the edges of abelian quantum Hall states
Speaker(s): Erez Berg
Abstract: We study the non-abelian statistics characterizing systems where counter-propagating gapless modes on the edges of fractional quantum Hall states are gapped by proximity-coupling to superconductors and ferromagnets. The most transparent example is that of a fractional quantum spin Hall state, in whi... read more
Date: 07/05/2013 - 9:45 am

PIRSA:13050052  ( MP4 Medium Res , MP4 Low Res , MP3 , PDF ) Which Format?
Majorana Ghosts: From topological superconductor to the origin of neutrino mass, three generations and their mass mixing
Speaker(s): Zheng-Cheng Gu
Abstract: The existence of three generations of neutrinos and their mass mixing is a deep mystery of our universe. On the other hand, Majorana's elegant work on the real solution of Dirac equation predicted the existence of Majorana particles in our nature, unfortunately, these Majorana particles have never b... read more
Date: 07/05/2013 - 11:00 am

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