Condensed Matter

Displaying 1105 - 1116 of 1280

One-photon and two-photon switching in graphene and optical nanomaterials

Mahi Singh Western University
March 08, 2013

PIRSA:13030094
Condensed Matter
Gravitational anomaly and topological phases

Shinsei Ryu University of Illinois at Urbana-Champaign (UIUC)
February 28, 2013

PIRSA:13020148
Condensed Matter
DMRG Studies on the Spin Liquid Ground State of the Kagome Model

Stefan Depenbrock Ludwig-Maximilians-Universität München (LMU)
February 26, 2013

PIRSA:13020147
Condensed Matter
A K matrix construction of symmetry enriched phases
February 20, 2013

PIRSA:13020140
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 14

Dmitry Abanin Princeton University
February 15, 2013

PIRSA:13020088
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 13

Dmitry Abanin Princeton University
February 14, 2013

PIRSA:13020087
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 12

Dmitry Abanin Princeton University
February 13, 2013

PIRSA:13020086
Condensed Matter
Fractional Quantum Hall States on an infinite cylinder: characterizing topological order and quasiparticle forces using infinite DMRG.

Michael Zaletel University of California, Berkeley
February 12, 2013

PIRSA:13020129
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 11

Dmitry Abanin Princeton University
February 12, 2013

PIRSA:13020085
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 10

Dmitry Abanin Princeton University
February 11, 2013

PIRSA:13020081
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 9

Dmitry Abanin Princeton University
February 11, 2013

PIRSA:13020084
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 8

Dmitry Abanin Princeton University
February 07, 2013

PIRSA:13020080
Condensed Matter

One-photon and two-photon switching in graphene and optical nanomaterials

Mahi Singh Western University
March 08, 2013

PIRSA:13030094
Condensed Matter
In this talk we will discuss both the one-photon and two-photon switching mechanisms in hybrid nanomaterials made from two or more semiconductor, metallic and optical nanostructures. The most prominent examples of these nanostructures are graphene, semiconductor quantum dots, metallic nanoparticles, and photonic and polaritonic crystals. Advances in nanoscience have allowed for the construction of these new classes of hybrid nanomaterials. Optical excitations in semiconductor nanostructures are electron-hole pairs (excitons) whereas excitations in metallic nanostructures are surface plasmons which are collective oscillations of electrons. Therefore, the combination of these systems can provide attractive opportunities to modify, design and control optical properties and to observe new phenomena which are based on exciton-plasmon interactions. It is expected that this research will provide a theoretical road map for the development of optical sensing and optical switching.
Gravitational anomaly and topological phases

Shinsei Ryu University of Illinois at Urbana-Champaign (UIUC)
February 28, 2013

PIRSA:13020148
Condensed Matter
Since the quantum Hall effect, the notion of topological phases of matter has been extended to those that are well-defined (or: ``protected'') in the presence of a certain set of symmetries, and that exist in dimensions higher than two. In the (fractional) quantum Hall effects (and in ``chiral'' topological phases in general), Laughlin's thought experiment provides a key insight into their topological characterization; it shows a close connection between topological phases and quantum anomalies. By taking various examples, I will demonstrate that quantum anomalies serve as a useful tool to diagnose (and even define) topological properties of the systems. For chiral topological phases in (2+1) dimensions and (3+1) dimensional topological superconductors, I will discuss topological responses of the system which involve a cross correlation between thermal transport, angular momentum, and entropy. We also argue that gravitational anomaly is useful to study symmetry protected topological phases in (2+1) dimensions.
DMRG Studies on the Spin Liquid Ground State of the Kagome Model

Stefan Depenbrock Ludwig-Maximilians-Universität München (LMU)
February 26, 2013

PIRSA:13020147
Condensed Matter
I will present a density-matrix renormalization group (DMRG) study of the S=1/2 Heisenberg antiferromagnet on the kagome lattice to identify the conjectured spin liquid ground state. Exploiting SU(2) spin symmetry, which allows us to keep up to 16,000 DMRG states, we consider cylinders with circumferences up to 17 lattice spacings and find a spin liquid ground state with an estimated per site energy of -0.4386(5), a spin gap of 0.13(1), very short-range decay in spin, dimer and chiral correlation functions and finite topological entanglement consistent with the logarithm of 2, ruling out gapless, chiral or non-topological spin liquids. All this would provide strong evidence for a gapped topological Z_2 spin liquid.
A K matrix construction of symmetry enriched phases
February 20, 2013

PIRSA:13020140
Condensed Matter
We construct in the K matrix formalism concrete examples of symmetry enriched topological phases, namely intrinsically topological phases with global symmetries. We focus on the Abelian and non-chiral topological phases and demonstrate by our examples how the interplay between the global symmetry and the fusion algebra of the anyons of a topologically ordered system determines the existence of gapless edge modes protected by the symmetry and that a (quasi)-group structure can be defined among these phases. Our examples include phases that display charge fractionalization and more exotic non-local anyon exchange under global symmetry that correspond to general group extensions of the global symmetry group.
12/13 PSI - Condensed Matter Review Lecture 14

Dmitry Abanin Princeton University
February 15, 2013

PIRSA:13020088
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 13

Dmitry Abanin Princeton University
February 14, 2013

PIRSA:13020087
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 12

Dmitry Abanin Princeton University
February 13, 2013

PIRSA:13020086
Condensed Matter
Fractional Quantum Hall States on an infinite cylinder: characterizing topological order and quasiparticle forces using infinite DMRG.

Michael Zaletel University of California, Berkeley
February 12, 2013

PIRSA:13020129
Condensed Matter
The density matrix renormalization group (DMRG), which has proved so successful in one dimension, has been making the push into higher dimensions, with the fractional quantum Hall (FQH) effect an important target. I'll briefly explain how the infinite DMRG algorithm can be adapted to find the degenerate ground states of a microscopic FQH Hamiltonian on an infinitely long cylinder, then focus on two applications. To characterize the topological order of the phase, I'll show that the bipartite entanglement spectrum of the ground state is sufficient to determine the quasiparticle charges, topological spins, quantum dimensions, chiral central charge, and Hall viscosity of the phase. Then I will show how to introduce localized quasiparticles of fixed topological charge. By pinning a pair of quasiparticles and dragging them into contact, we can directly measure the force curve of their interaction.
12/13 PSI - Condensed Matter Review Lecture 11

Dmitry Abanin Princeton University
February 12, 2013

PIRSA:13020085
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 10

Dmitry Abanin Princeton University
February 11, 2013

PIRSA:13020081
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 9

Dmitry Abanin Princeton University
February 11, 2013

PIRSA:13020084
Condensed Matter
12/13 PSI - Condensed Matter Review Lecture 8

Dmitry Abanin Princeton University
February 07, 2013

PIRSA:13020080
Condensed Matter

Title	Speaker(s)	Date	Talk Type	Info link
One-photon and two-photon switching in graphene and optical nanomaterials	Mahi Singh	2013-03-08	Scientific Series	View details
Gravitational anomaly and topological phases	Shinsei Ryu	2013-02-28	Scientific Series	View details
DMRG Studies on the Spin Liquid Ground State of the Kagome Model	Stefan Depenbrock	2013-02-26	Scientific Series	View details
A K matrix construction of symmetry enriched phases		2013-02-20	Scientific Series	View details
12/13 PSI - Condensed Matter Review Lecture 14	Dmitry Abanin	2013-02-15	Course	View details
12/13 PSI - Condensed Matter Review Lecture 13	Dmitry Abanin	2013-02-14	Course	View details
12/13 PSI - Condensed Matter Review Lecture 12	Dmitry Abanin	2013-02-13	Course	View details
Fractional Quantum Hall States on an infinite cylinder: characterizing topological order and quasiparticle forces using infinite DMRG.	Michael Zaletel	2013-02-12	Scientific Series	View details
12/13 PSI - Condensed Matter Review Lecture 11	Dmitry Abanin	2013-02-12	Course	View details
12/13 PSI - Condensed Matter Review Lecture 10	Dmitry Abanin	2013-02-11	Course	View details
12/13 PSI - Condensed Matter Review Lecture 9	Dmitry Abanin	2013-02-11	Course	View details
12/13 PSI - Condensed Matter Review Lecture 8	Dmitry Abanin	2013-02-07	Course	View details

Supported by

Format results

One-photon and two-photon switching in graphene and optical nanomaterials

Gravitational anomaly and topological phases

DMRG Studies on the Spin Liquid Ground State of the Kagome Model

A K matrix construction of symmetry enriched phases

12/13 PSI - Condensed Matter Review Lecture 14

12/13 PSI - Condensed Matter Review Lecture 13

12/13 PSI - Condensed Matter Review Lecture 12

Fractional Quantum Hall States on an infinite cylinder: characterizing topological order and quasiparticle forces using infinite DMRG.

12/13 PSI - Condensed Matter Review Lecture 11

12/13 PSI - Condensed Matter Review Lecture 10

12/13 PSI - Condensed Matter Review Lecture 9

12/13 PSI - Condensed Matter Review Lecture 8

One-photon and two-photon switching in graphene and optical nanomaterials

Gravitational anomaly and topological phases

DMRG Studies on the Spin Liquid Ground State of the Kagome Model

A K matrix construction of symmetry enriched phases

12/13 PSI - Condensed Matter Review Lecture 14

12/13 PSI - Condensed Matter Review Lecture 13

12/13 PSI - Condensed Matter Review Lecture 12

Fractional Quantum Hall States on an infinite cylinder: characterizing topological order and quasiparticle forces using infinite DMRG.

12/13 PSI - Condensed Matter Review Lecture 11

12/13 PSI - Condensed Matter Review Lecture 10

12/13 PSI - Condensed Matter Review Lecture 9

12/13 PSI - Condensed Matter Review Lecture 8