Condensed Matter

Displaying 1045 - 1056 of 1166

Condensed Matter - Lecture 1

Assa Auerbach Technion - Israel Institute of Technology
October 09, 2012

PIRSA:12100022
Condensed Matter
Effect of thermal fluctuations in topological p-wave superconductors

Bela Bauer Microsoft Corporation
September 21, 2012

PIRSA:12090039
Condensed Matter
Charge fractionalization and entanglement entropy for compressible phases in holography

Liza Huijse Karius, Inc.
September 11, 2012

PIRSA:12090059
Condensed Matter
Condensed Matter 101 - Lecture 4

Denis Dalidovich
August 30, 2012

PIRSA:12080035
Condensed Matter
Condensed Matter 101 - Lecture 3

Denis Dalidovich
August 29, 2012

PIRSA:12080034
Condensed Matter
Condensed Matter 101 - Lecture 2

Denis Dalidovich
August 28, 2012

PIRSA:12080033
Condensed Matter
Condensed Matter 101 - Lecture 1

Denis Dalidovich
August 27, 2012

PIRSA:12080032
Condensed Matter
Glass: The Cinderella Problem of Condensed Matter Physics

Anthony Leggett University of Illinois Urbana-Champaign
August 03, 2012

PIRSA:12080001
Condensed Matter
Integer Quantum Hall Effect for Bosons: A Physical Realization

Senthil Todadri Massachusetts Institute of Technology (MIT) - Department of Physics
July 27, 2012

PIRSA:12070013
Condensed Matter
Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects

Ashvin Vishwanath Harvard University
July 27, 2012

PIRSA:12070012
Condensed Matter
Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem

Subir Sachdev Harvard University
July 11, 2012

PIRSA:12070009
Condensed Matter
Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice
June 15, 2012

PIRSA:12060072
Condensed Matter

Condensed Matter - Lecture 1

Assa Auerbach Technion - Israel Institute of Technology
October 09, 2012

PIRSA:12100022
Condensed Matter
Effect of thermal fluctuations in topological p-wave superconductors

Bela Bauer Microsoft Corporation
September 21, 2012

PIRSA:12090039
Condensed Matter
In this talk, I will present our recent work on the effect of thermal fluctuations on the topological stability of chiral p-wave superconductors. We consider two models of superconductors: spinless and spinful with a focus on topological properties and Majorana zero-energy modes. We show that proliferation of vortex-antivortex pairs above the Kosterlitz-Thouless temperature T_KT drives the transition from a thermal Quantum Hall insulator to a thermal metal/insulator, and dramatically modifies the ground-state degeneracy splitting. This shows that in order to utilize 2D chiral p-wave superconductors for topological quantum computing, the temperature should be much smaller than T_KT. Within the spinful chiral p-wave model, we also investigate the interplay between half-quantum vortices carrying Majorana zero-energy modes and full-quantum vortices having trivial topological charge, and discuss topological properties of half-quantum vortices in the background of proliferating full-quantum vortices.
Charge fractionalization and entanglement entropy for compressible phases in holography

Liza Huijse Karius, Inc.
September 11, 2012

PIRSA:12090059
Condensed Matter
Condensed Matter 101 - Lecture 4

Denis Dalidovich
August 30, 2012

PIRSA:12080035
Condensed Matter
Condensed Matter 101 - Lecture 3

Denis Dalidovich
August 29, 2012

PIRSA:12080034
Condensed Matter
Condensed Matter 101 - Lecture 2

Denis Dalidovich
August 28, 2012

PIRSA:12080033
Condensed Matter
Condensed Matter 101 - Lecture 1

Denis Dalidovich
August 27, 2012

PIRSA:12080032
Condensed Matter
Glass: The Cinderella Problem of Condensed Matter Physics

Anthony Leggett University of Illinois Urbana-Champaign
August 03, 2012

PIRSA:12080001
Condensed Matter
Amorphous materials (glasses) probably constitute >90% of the solid matter surrounding us in everyday life,yet traditional textbooks of condensed matter physics devote virtually no space to them.Crudely speaking,the puzzles in the behavior of glasses can be divided into three major areas:the glass transition itself,the characteristic long-term memory effects and the near-equilibrium thermal,dielectric and transport properties;this talk focusses entirely on the third area.Over the last 40 years it has become apparent that the thermal and transport properties are not only qualitatively universal between glasses with totally different chemistry and microstructure,but in some cases possess a truly mind-boggling degree of _quantitative_ universality.In this talk I will describe the salient experimental data,review the established ("tunnelling two-level system") model commonly used to interpret them,and introduce a rather different scenario (developed in collaboration with D.C.Vural) which holds out some prospect of explaining the universalities in a natural way.
Integer Quantum Hall Effect for Bosons: A Physical Realization

Senthil Todadri Massachusetts Institute of Technology (MIT) - Department of Physics
July 27, 2012

PIRSA:12070013
Condensed Matter
A simple physical realization of an integer quantum Hall state of interacting two dimensional bosons is provided. This is an example of a "symmetry-protected topological" (SPT) phase which is a generalization of the concept of topological insulators to systems of interacting bosons or fermions. Universal physical properties of the boson integer quantum Hall state are described and shown to correspond to those expected from general classifications of SPT phases.
Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects

Ashvin Vishwanath Harvard University
July 27, 2012

PIRSA:12070012
Condensed Matter
I will briefly review topological phases of non interacting fermions, such as topological insulators, and discuss how ideas from quantum information, in particular the entanglement spectrum, can be used to characterize them. For topological phases protected by inversion symmetry I argue that this is the ideal tool, and discuss how it leads to a classification of 3D topological phases. Next, I will discuss topological phases that only appear in the presence of interactions, although they share essential characteristics with non-interacting topological phases. A general theory of such states of bosons in 2+1 dimensions will be given, and specific examples, the bosonic analogs of topological superconductors and insulators, will be discussed.
Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem

Subir Sachdev Harvard University
July 11, 2012

PIRSA:12070009
Condensed Matter
It has long been known that a metal near an instability to antiferromagnetism also has a weak-coupling Cooper instability to spin-singlet d-wave-like superconductivity. However, the theory of the antiferromagnetic quantum critical point flows to strong-coupling in two spatial dimensions, and so the fate of the superconductivity has also been unclear. I will describe a method to realize the generic antiferromagnetic quantum critical in a metal in a sign-problem-free Monte Carlo simulation. Results showing Fermi surface reconstruction and unconventional spin-singlet superconductivity across the critical point are obtained.
Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice
June 15, 2012

PIRSA:12060072
Condensed Matter
We discuss the thermodynamic properties of the model exchange quantum spin ice material Yb_2Ti_2O_7. Using exchange parameters recently determined from high-field neutron scattering measurements, we calculate the thermodynamic properties of this model system. We find very good agreement with the heat capacity, entropy and magnetization measurements on the materials. We show that, in the weak quantum regime, quantum fluctuations lead to the selection, within the spin-ice manifold, of a conventional ordered ground state. However, the excitations above the ground state and their dynamics remain highly non-trivial. They consist of weakly bound spinon-antispinon pairs separated by long strings. We present several pieces of indirect evidence that the low temperature phase transition observed in these materials is to this conventional ordered state.

Title	Speaker(s)	Date	Talk Type	Info link
Condensed Matter - Lecture 1	Assa Auerbach	2012-10-09	Course	View details
Effect of thermal fluctuations in topological p-wave superconductors	Bela Bauer	2012-09-21	Scientific Series	View details
Charge fractionalization and entanglement entropy for compressible phases in holography	Liza Huijse	2012-09-11	Scientific Series	View details
Condensed Matter 101 - Lecture 4	Denis Dalidovich	2012-08-30	Course	View details
Condensed Matter 101 - Lecture 3	Denis Dalidovich	2012-08-29	Course	View details
Condensed Matter 101 - Lecture 2	Denis Dalidovich	2012-08-28	Course	View details
Condensed Matter 101 - Lecture 1	Denis Dalidovich	2012-08-27	Course	View details
Glass: The Cinderella Problem of Condensed Matter Physics	Anthony Leggett	2012-08-03	Scientific Series	View details
Integer Quantum Hall Effect for Bosons: A Physical Realization	Senthil Todadri	2012-07-27	Scientific Series	View details
Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects	Ashvin Vishwanath	2012-07-27	Scientific Series	View details
Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem	Subir Sachdev	2012-07-11	Scientific Series	View details
Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice		2012-06-15	Scientific Series	View details

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Condensed Matter - Lecture 1

Effect of thermal fluctuations in topological p-wave superconductors

Charge fractionalization and entanglement entropy for compressible phases in holography

Condensed Matter 101 - Lecture 4

Condensed Matter 101 - Lecture 3

Condensed Matter 101 - Lecture 2

Condensed Matter 101 - Lecture 1

Glass: The Cinderella Problem of Condensed Matter Physics

Integer Quantum Hall Effect for Bosons: A Physical Realization

Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects

Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem

Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice

Condensed Matter - Lecture 1

Effect of thermal fluctuations in topological p-wave superconductors

Charge fractionalization and entanglement entropy for compressible phases in holography

Condensed Matter 101 - Lecture 4

Condensed Matter 101 - Lecture 3

Condensed Matter 101 - Lecture 2

Condensed Matter 101 - Lecture 1

Glass: The Cinderella Problem of Condensed Matter Physics

Integer Quantum Hall Effect for Bosons: A Physical Realization

Symmetry Protected Topological Phases; from Quantum Entanglement to Interaction Effects

Entangling Superconductivity and antiferromagnetism: Quantum Monte Carlo without the sign Problem

Pyrochlore Material Yb_2Ti_2O_7: A Model Quantum Spin Ice