Talks

9709 - 9720 of 18076 Results

Emergence of p+ip topological superconducting ground state in infinite-U Hubbard model on honeycomb lattice

Zheng-Cheng Gu Chinese University of Hong Kong

February 10, 2014

PIRSA:14020113
13/14 PSI - Cosmology Review - Lecture 9

Latham Boyle University of Edinburgh

February 10, 2014

PIRSA:14020017
Aharonov-Bohm effect in symmetry protected states

Luiz Santos Emory University

February 10, 2014

PIRSA:14020126
13/14 PSI - String Theory Review - Lecture 10

Davide Gaiotto Perimeter Institute for Theoretical Physics

February 10, 2014

PIRSA:14020028
Topological phases in graphene

Zlatko Papic University of Leeds

February 10, 2014

PIRSA:14020134
13/14 PSI - Condensed Matter Review - Lecture 10

Alioscia Hamma University of Naples Federico II

February 10, 2014

PIRSA:14020046
Introduction to Effective Field Theories - Lecture 10

Cliff Burgess McMaster University

February 07, 2014

PIRSA:14020092
13/14 PSI - Cosmology Review - Lecture 8

Latham Boyle University of Edinburgh

February 07, 2014

PIRSA:14020014
13/14 PSI - String Theory Review - Lecture 9

Davide Gaiotto Perimeter Institute for Theoretical Physics

February 07, 2014

PIRSA:14020027
Introduction to Effective Field Theories - Lecture 9

Cliff Burgess McMaster University

February 07, 2014

PIRSA:14020088
13/14 PSI - Condensed Matter Review - Lecture 9

Alioscia Hamma University of Naples Federico II

February 07, 2014

PIRSA:14020045
Bosonic particle-correlated states

Zhang Jiang University of New Mexico

February 06, 2014

PIRSA:14020135

Quantum Physics

Emergence of p+ip topological superconducting ground state in infinite-U Hubbard model on honeycomb lattice

Zheng-Cheng Gu Chinese University of Hong Kong

February 10, 2014

PIRSA:14020113

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.
13/14 PSI - Cosmology Review - Lecture 9

Latham Boyle University of Edinburgh

February 10, 2014

PIRSA:14020017
Aharonov-Bohm effect in symmetry protected states

Luiz Santos Emory University

February 10, 2014

PIRSA:14020126

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 terms of group cohomology as well as from the point of view of effective field theories. An interesting related question is to understand the structute of lattice models that realize SPT physics. In this talk, I shall present a class of lattice models describing the egde of non-chiral two-dimensional bosonic SPT states protected by Z_N symmetry. A crucial aspect of the construction relies on finding the correct non-trivial Z_N symmetry realizations on the edge consistent with all the possible classes of SPT states. Then I shall discuss the Aharonov-Bohm effect on the many-body SPT state by studying this many-body effect on the aforementioned gapless edge states. The effect of a Z_N gauge flux on the egde states is formulated in terms of twisted boundary conditions of the lattice models. The low energy spectral shifts due to the gauge flux are shown to depend on each of the SPT classes in a predictable way. I shall, in the course of this talk, present numerical results of exact diagonalization of our lattice Hamiltonians that support this analysis. This work is done in collaboration with Juven Wang and
appears in arXiv:1310.8291.
13/14 PSI - String Theory Review - Lecture 10

Davide Gaiotto Perimeter Institute for Theoretical Physics

February 10, 2014

PIRSA:14020028
Topological phases in graphene

Zlatko Papic University of Leeds

February 10, 2014

PIRSA:14020134

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 original constituents. Most of our experimental knowledge of such ``topological" phases of matter comes from studies of two-dimensional electron gases in GaAs semiconductors in high magnetic fields and at low temperatures. In the first part of this talk, I will give an introduction to these systems and review some latest theoretical developments related to their entanglement properties. In the second part, I will discuss new possibilities
for experimental realizations of topological phases in bilayer graphene. I will present evidence that this material supports an ``even-denominator" fractional state, related to the Moore-Read state, whose observation has recently been reported. Finally, I will outline several proposals based on the tunability of the electron-electron interactions in bilayer graphene which might enable further experimental progress beyond GaAs.
13/14 PSI - Condensed Matter Review - Lecture 10

Alioscia Hamma University of Naples Federico II

February 10, 2014

PIRSA:14020046
Introduction to Effective Field Theories - Lecture 10

Cliff Burgess McMaster University

February 07, 2014

PIRSA:14020092
13/14 PSI - Cosmology Review - Lecture 8

Latham Boyle University of Edinburgh

February 07, 2014

PIRSA:14020014
13/14 PSI - String Theory Review - Lecture 9

Davide Gaiotto Perimeter Institute for Theoretical Physics

February 07, 2014

PIRSA:14020027
Introduction to Effective Field Theories - Lecture 9

Cliff Burgess McMaster University

February 07, 2014

PIRSA:14020088
13/14 PSI - Condensed Matter Review - Lecture 9

Alioscia Hamma University of Naples Federico II

February 07, 2014

PIRSA:14020045
Bosonic particle-correlated states

Zhang Jiang University of New Mexico

February 06, 2014

PIRSA:14020135

Quantum Physics

Quantum many-body problems are notorious hard. This is partly because the Hilbert space becomes exponentially big with the particle number N. While exact solutions are often considered intractable, numerous approaches have been proposed using approximations. A common trait of these approaches is to use an ansatz such that the number of parameters either does not depend on N or is proportional to N, e.g., the matrix-product state for spin lattices, the BCS wave function for superconductivity, the Laughlin wave function for fractional quantum Hall effects, and the Gross-Pitaecskii theory for BECs. Among them the product ansatz for BECs has precisely predicted many useful properties of Bose gases at ultra-low temperature. As particle-particle correlation becomes important, however, it begins to fail. To capture the quantum correlations, we propose a new
set of states, which constitute a natural generalization of the product-state ansatz. Our state of N=d& times;n identical particles is derived by symmetrizing the n-fold product of a d-particle quantum state. For fixed d, the parameter space of our state does not grow with N. Numerically, we show that our ansatz gives the right description for the ground state and time evolution of the two-site Bose-Hubbard model.

Title	Date	Collection	Type	Info
Emergence of p+ip topological superconducting ground state in infinite-U Hubbard model on honeycomb lattice	2014‑02‑10	Emergence in Complex Systems	Conference	View details
13/14 PSI - Cosmology Review - Lecture 9	2014‑02‑10	13/14 PSI - Cosmology Review	Course	View details
Aharonov-Bohm effect in symmetry protected states	2014‑02‑10	Emergence in Complex Systems	Conference	View details
13/14 PSI - String Theory Review - Lecture 10	2014‑02‑10	13/14 PSI - String Theory Review	Course	View details
Topological phases in graphene	2014‑02‑10	Emergence in Complex Systems	Conference	View details
13/14 PSI - Condensed Matter Review - Lecture 10	2014‑02‑10	13/14 PSI - Condensed Matter Review	Course	View details
Introduction to Effective Field Theories - Lecture 10	2014‑02‑07	Introduction to Effective Field Theories	Course	View details
13/14 PSI - Cosmology Review - Lecture 8	2014‑02‑07	13/14 PSI - Cosmology Review	Course	View details
13/14 PSI - String Theory Review - Lecture 9	2014‑02‑07	13/14 PSI - String Theory Review	Course	View details
Introduction to Effective Field Theories - Lecture 9	2014‑02‑07	Introduction to Effective Field Theories	Course	View details
13/14 PSI - Condensed Matter Review - Lecture 9	2014‑02‑07	13/14 PSI - Condensed Matter Review	Course	View details
Bosonic particle-correlated states	2014‑02‑06	Perimeter Institute Quantum Discussions	Scientific Series	View details

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Format results

Emergence of p+ip topological superconducting ground state in infinite-U Hubbard model on honeycomb lattice

13/14 PSI - Cosmology Review - Lecture 9

Aharonov-Bohm effect in symmetry protected states

13/14 PSI - String Theory Review - Lecture 10

Topological phases in graphene

13/14 PSI - Condensed Matter Review - Lecture 10

Introduction to Effective Field Theories - Lecture 10

13/14 PSI - Cosmology Review - Lecture 8

13/14 PSI - String Theory Review - Lecture 9

Introduction to Effective Field Theories - Lecture 9

13/14 PSI - Condensed Matter Review - Lecture 9

Bosonic particle-correlated states

Emergence of p+ip topological superconducting ground state in infinite-U Hubbard model on honeycomb lattice

13/14 PSI - Cosmology Review - Lecture 9

Aharonov-Bohm effect in symmetry protected states

13/14 PSI - String Theory Review - Lecture 10

Topological phases in graphene

13/14 PSI - Condensed Matter Review - Lecture 10

Introduction to Effective Field Theories - Lecture 10

13/14 PSI - Cosmology Review - Lecture 8

13/14 PSI - String Theory Review - Lecture 9

Introduction to Effective Field Theories - Lecture 9

13/14 PSI - Condensed Matter Review - Lecture 9

Bosonic particle-correlated states