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Condensed Matter

This series consists of talks in the area of Condensed Matter.

Seminar Series Events/Videos

juil 2 2015 - 3:00pm
Room #: 400
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juil 7 2015 - 3:00pm
Room #: 400
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juil 9 2015 - 3:00pm
Room #: 400
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juil 14 2015 - 3:00pm
Room #: 400
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juil 16 2015 - 3:00pm
Room #: 400
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juil 21 2015 - 3:00pm
Room #: 405
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juil 23 2015 - 3:00pm
Room #: 400
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juil 28 2015 - 3:00pm
Room #: 405
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juil 30 2015 - 3:00pm
Room #: 400
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aoû 4 2015 - 3:00pm
Room #: 405
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Jeudi juin 18, 2015
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Mardi juin 16, 2015
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Mardi juin 16, 2015
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The properties of a strange metal fermion model with infinite-range

interactions turn out to be closely related to those of charged black holes

with AdS2 horizons. I show that a microscopic computation of the ground

state entropy density of the fermion model yields precisely the Bekenstein-Hawking

entropy density of the black hole. The fermion model is UV finite and has no supersymmetry

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Jeudi juin 11, 2015
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Mardi juin 09, 2015
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Jeudi mai 28, 2015
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Mardi mai 26, 2015

Parafermions are the simplest generalizations of Majorana fermions that realize topological order. We propose a less restrictive notion of topological order in 1D open chains, which generalizes the seminal work by Fendley [J. Stat. Mech., P11020 (2012)]. The first essential property is that the groundstates are mutually indistinguishable by local, symmetric probes, and the second is a generalized notion of zero edge modes which cyclically permute the groundstates.

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Mardi mai 19, 2015
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We analyse a class of 1D lattice models, known as M_k models, which are characterised by an order-k clustering of spin-less fermions and by N=2 lattice supersymmetry. We show a fundamental connection to Z_k parafermions and identify a class of (bulk or edge) defects, which are in one-to-one correspondence with so-called spin fields in the parafermion CFT. In the gapped regime, injecting such defects leads to ground state degeneracies that are protected by the supersymmetry.

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Mardi avr 28, 2015
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The standard theory of topological insulators and superfluids (or superconductors) assumes that the fermionic elementary excitations in these systems – electrons in the insulator and Bogoliubov quasiparticles in the superfluid – do not interact with one another. In this talk I will discuss extensions of this theory to include the effects of interparticle interactions on the topological surface states of 3D topological insulators and superfluids.

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Lundi avr 27, 2015
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Recent progress on the construction of holographic lattices and its applications to AdS/CMT correspondence will be briefly reviewed. Our special interests will focus on the building of bulk geometry of gravity whose holographic duals exhibit metal-insulator transitions (MIT). In particular, the Peierls phase transition induced by charge density waves is implemented in a holographic manner. The holographic entanglement entropy close to quantum critical points will be discussed as well.

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