Condensed Matter

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12/13 PSI - Condensed Matter Review Lecture 7

Dmitry Abanin
February 06, 2013

PIRSA:13020079
Condensed Matter
Looking for spinon deconfinement in two dimensions

Ying Tang Boston College
February 05, 2013

PIRSA:13020127
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 6

Dmitry Abanin
February 04, 2013

PIRSA:13020077
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 5

Alioscia Hamma University of Naples Federico II
February 01, 2013

PIRSA:13020074
Condensed Matter
A classification of symmetry enriched topological phases with exactly solvable models

Ying Ran Boston College
February 01, 2013

PIRSA:13020122
Condensed Matter
Searching for topological phases in transition metal oxide heterostructures

Ying Ran Boston College
January 31, 2013

PIRSA:13010113
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 4

Alioscia Hamma University of Naples Federico II
January 31, 2013

PIRSA:13010100
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 3

Alioscia Hamma University of Naples Federico II
January 30, 2013

PIRSA:13010099
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 2

Alioscia Hamma University of Naples Federico II
January 29, 2013

PIRSA:13010098
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 1

Alioscia Hamma University of Naples Federico II
January 28, 2013

PIRSA:13010097
Condensed Matter
Superfluid to normal phase transition in strongly interacting bosons in two and three dimensions.

Juan Carrasquilla ETH Zurich
January 22, 2013

PIRSA:13010107
Condensed Matter
Field-induced thermal transport in BEC antiferromagnets

Alexander Chernyshev University of California, Irvine
January 08, 2013

PIRSA:13010002
Condensed Matter

12/13 PSI - Condensed Matter Review Lecture 7

Dmitry Abanin
February 06, 2013

PIRSA:13020079
Condensed Matter
Looking for spinon deconfinement in two dimensions

Ying Tang Boston College
February 05, 2013

PIRSA:13020127
Condensed Matter
We have used a recently proposed quantum Monte Carlo algorithm [1] to study spinons (emergent S = 1/2 excitations) in 2D Resonating-Valence-Bond (RVB) spin liquids and in a J-Q model hosting a Neel – Valence Bond Solid (VBS) phase transition at zero temperature [2]. We confirm that spinons are well defined quasi-particles with finite intrinsic size in the RVB spin liquid. The distance distribution between two spinons shows signatures of deconfinement.
However, at the Neel–VBS transition, we found that the size of a single spinon is significantly greater than the bound-state in VBS, which indicates that spinons are “soft” and shrink when bound state is formed. Both spinon size and confinement length diverge as the critical point is approached. We have also compared spinon statistics in J-Q model with bilayer Heisenberg model and 1D spin chain. We conclude that the spinon deconfinement is marginal in the lowest-energy state in the spin-1 sector, due to very weak attractive spinon interactions. Deconfinement in the vicinity of the critical point should occur at higher energies.
12/13 PSI - Condensed Matter Review Lecture 6

Dmitry Abanin
February 04, 2013

PIRSA:13020077
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 5

Alioscia Hamma University of Naples Federico II
February 01, 2013

PIRSA:13020074
Condensed Matter
A classification of symmetry enriched topological phases with exactly solvable models

Ying Ran Boston College
February 01, 2013

PIRSA:13020122
Condensed Matter
Two types of topological phases have attracted a lot of attention in condensed matter physics: symmetry protected topological(SPT) phases and topologically ordered phases. On the one hand, SPT phases are protected by given global symmetries while there is no topological order in the bulk. On the other hand, topologically ordered phases do not require symmetry and feature topological ground state degeneracy. In this talk, I present a classification of phases with both topological orders and global symmetries, equipped with local bosonic exactly solvable models. This classification, in some sense, organizes previous pieces of understandings on SPT phases, topological orders, symmetry fractionalizations, into a single framework. Solution of the exactly solvable models and measurable consequences will be discussed.
Searching for topological phases in transition metal oxide heterostructures

Ying Ran Boston College
January 31, 2013

PIRSA:13010113
Condensed Matter
In this talk I will present our recent investigations on possible topological phases in (111) heterostructures of transition metal oxide. These (111) heterstructures are promising systems to realize many 2D topological phases at high temperatures, even with strong correlations, which is hard to be achieved in conventional materials. Several examples will be discussed, including high-temperature quantum spin hall effect in LaAlO3/LaAuO3/LaAlO3 bilayer, correlation induced topological phases in LaAlO3/LaNiO3/LaAlO3 multilayer, nearly flat topological band with C=2 (C: Chern number) in SrIrO3 trilayer, and abelian/nonabelian fractional quantum hall effects in the absence of Landau levels (fractional Chern insulators). If time is allowed, I will also briefly introduce our work on classifying wavefunctions of fractional Chern/topological insulators.
12/13 PSI - Condensed Matter Review Lecture 4

Alioscia Hamma University of Naples Federico II
January 31, 2013

PIRSA:13010100
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 3

Alioscia Hamma University of Naples Federico II
January 30, 2013

PIRSA:13010099
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 2

Alioscia Hamma University of Naples Federico II
January 29, 2013

PIRSA:13010098
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 1

Alioscia Hamma University of Naples Federico II
January 28, 2013

PIRSA:13010097
Condensed Matter
Superfluid to normal phase transition in strongly interacting bosons in two and three dimensions.

Juan Carrasquilla ETH Zurich
January 22, 2013

PIRSA:13010107
Condensed Matter
Using quantum Monte Carlo simulations, we investigate the finite-temperature phase diagram of hard-core bosons (XY model) in two- and three-dimensional square lattices. To determine the phase boundaries, we perform a finite-size scaling analysis of the condensate fraction and/or the superfluid stiffness. We then discuss how this diagrams can be measured in experiments with trapped ultracold gases, where the systems are inhomogeneous. For that, we introduce a method based on the measurement of the zero-momentum occupation, which is adequate for experiments dealing with both homogeneous and trapped systems. Finally, we provide an analytical argument that demonstrates that the Bose-Hubbard model does not exhibit ﬁnite-temperature BEC in two dimensions, provided that density remains finite across the entire system in the thermodynamic limit.
Field-induced thermal transport in BEC antiferromagnets

Alexander Chernyshev University of California, Irvine
January 08, 2013

PIRSA:13010002
Condensed Matter
Recent experiments in BEC quantum magnets exhibit a dramatic evolution of the thermal conductivity of these materials in magnetic field. By considering various relaxation mechanisms of bosonic excitations in the vicinity of the BEC quantum-critical point at finite temperature we provide a detailed explanation of several unusual features of the data. We identify the leading impurity-scattering interaction and demonstrate that its renormalization due to quantum fluctuations of the paramagnetic state compensates the related mass renormalization effect. This explains the enigmatic absence of the asymmetry between the two critical points in the low-T thermal conductivity data, while such an asymmetry is prominent in many other physical quantities. The observed characteristic "migration'' of the peak in thermal conductivity away from the transition points as a function of temperature is explained as due to a competition between an increase in the number of heat carriers and an enhancement of their mutual scattering. An important role of the three-boson scattering processes within the ordered phase of these systems is also discussed. Other qualitative and quantitative features of the experiment are clarified and the future directions are sketched.

Title	Speaker(s)	Date	Talk Type	Info link
12/13 PSI - Condensed Matter Review Lecture 7	Dmitry Abanin	2013-02-06	Course	View details
Looking for spinon deconfinement in two dimensions	Ying Tang	2013-02-05	Scientific Series	View details
12/13 PSI - Condensed Matter Review Lecture 6	Dmitry Abanin	2013-02-04	Course	View details
12/13 PSI - Condensed Matter Review Lecture 5	Alioscia Hamma	2013-02-01	Course	View details
A classification of symmetry enriched topological phases with exactly solvable models	Ying Ran	2013-02-01	Scientific Series	View details
Searching for topological phases in transition metal oxide heterostructures	Ying Ran	2013-01-31	Scientific Series	View details
12/13 PSI - Condensed Matter Review Lecture 4	Alioscia Hamma	2013-01-31	Course	View details
12/13 PSI - Condensed Matter Review Lecture 3	Alioscia Hamma	2013-01-30	Course	View details
12/13 PSI - Condensed Matter Review Lecture 2	Alioscia Hamma	2013-01-29	Course	View details
12/13 PSI - Condensed Matter Review Lecture 1	Alioscia Hamma	2013-01-28	Course	View details
Superfluid to normal phase transition in strongly interacting bosons in two and three dimensions.	Juan Carrasquilla	2013-01-22	Scientific Series	View details
Field-induced thermal transport in BEC antiferromagnets	Alexander Chernyshev	2013-01-08	Scientific Series	View details

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12/13 PSI - Condensed Matter Review Lecture 7

Looking for spinon deconfinement in two dimensions

12/13 PSI - Condensed Matter Review Lecture 6

12/13 PSI - Condensed Matter Review Lecture 5

A classification of symmetry enriched topological phases with exactly solvable models

Searching for topological phases in transition metal oxide heterostructures

12/13 PSI - Condensed Matter Review Lecture 4

12/13 PSI - Condensed Matter Review Lecture 3

12/13 PSI - Condensed Matter Review Lecture 2

12/13 PSI - Condensed Matter Review Lecture 1

Superfluid to normal phase transition in strongly interacting bosons in two and three dimensions.

Field-induced thermal transport in BEC antiferromagnets

12/13 PSI - Condensed Matter Review Lecture 7

Looking for spinon deconfinement in two dimensions

12/13 PSI - Condensed Matter Review Lecture 6

12/13 PSI - Condensed Matter Review Lecture 5

A classification of symmetry enriched topological phases with exactly solvable models

Searching for topological phases in transition metal oxide heterostructures

12/13 PSI - Condensed Matter Review Lecture 4

12/13 PSI - Condensed Matter Review Lecture 3

12/13 PSI - Condensed Matter Review Lecture 2

12/13 PSI - Condensed Matter Review Lecture 1

Superfluid to normal phase transition in strongly interacting bosons in two and three dimensions.

Field-induced thermal transport in BEC antiferromagnets