Condensed Matter

Displaying 1141 - 1152 of 1280

Superradiant Superconductivity

Baskaran Ganapathy Institute of Mathematical Sciences
November 16, 2012

PIRSA:12110071
Condensed Matter
Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Xiaoliang Qi Stanford University
October 26, 2012

PIRSA:12100051
Condensed Matter
Condensed Matter - Lecture 14

Assa Auerbach Technion – Israel Institute of Technology
October 26, 2012

PIRSA:12100039
Condensed Matter
Condensed Matter - Lecture 13

Assa Auerbach Technion – Israel Institute of Technology
October 25, 2012

PIRSA:12100038
Condensed Matter
Condensed Matter - Lecture 12

Assa Auerbach Technion – Israel Institute of Technology
October 24, 2012

PIRSA:12100037
Condensed Matter
Condensed Matter - Lecture 11

Assa Auerbach Technion – Israel Institute of Technology
October 23, 2012

PIRSA:12100036
Condensed Matter
Condensed Matter - Lecture 10

Assa Auerbach Technion – Israel Institute of Technology
October 22, 2012

PIRSA:12100035
Condensed Matter
Self-localization of a single hole in Mott antiferromagnets

Zheng-Yu Weng Tsinghua University
October 19, 2012

PIRSA:12100077
Condensed Matter
Condensed Matter - Lecture 9

Assa Auerbach Technion – Israel Institute of Technology
October 19, 2012

PIRSA:12100032
Condensed Matter
Condensed Matter - Lecture 8

Assa Auerbach Technion – Israel Institute of Technology
October 18, 2012

PIRSA:12100031
Condensed Matter
Condensed Matter - Lecture 7

Assa Auerbach Technion – Israel Institute of Technology
October 17, 2012

PIRSA:12100030
Condensed Matter
Condensed Matter Seminar

Assa Auerbach Technion – Israel Institute of Technology
October 16, 2012

PIRSA:12100078
Condensed Matter

Superradiant Superconductivity

Baskaran Ganapathy Institute of Mathematical Sciences
November 16, 2012

PIRSA:12110071
Condensed Matter
In Dicke Superradiance, a collection of 2-level atoms interacting with a single boson mode acquires, through quantum coherence, an enhanced emission property and a rich dynamics. We suggest possibility of Dicke superradiance in a BCS superconductor. The necessary 2-level atoms are identified with Anderson pseudo spins seeing a self consistent mean field in k-space. A way to couple these 2-level bose atoms to an external boson mode and create a novel non equilibrium superradiant superconductivity (SRSC) is suggested. Our mechanism offers a hope to realize transient superconductivity, even at room temperatures, in the pseudo gap phase of certain underdoped cuprates. Recent experiments are briefly discussed in this light. Further SRSC exhibits interesting quantum entanglement and superfluorescence properties.
Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Xiaoliang Qi Stanford University
October 26, 2012

PIRSA:12100051
Condensed Matter
An exciting new prospect in condensed matter physics is the possibility of realizing fractional quantum Hall states in simple lattice models without a large external magnetic field, which are called fractional Chern insulators. A fundamental question is whether qualitatively new states can be realized on the lattice as compared with ordinary fractional quantum Hall states. Here we propose new symmetry-enriched topological states, topological nematic states, which are a dramatic consequence of the interplay between the lattice translational symmetry and topological properties of these fractional Chern insulators. The topological nematic states are realized in a partially filled flat band with a Chern number N, which can be mapped to an N-layer quantum Hall system on a regular lattice. However, in the topological nematic states the lattice dislocations become non-Abelian defects which create "worm holes" connecting the effective layers, and effectively change the topology of the space. Such topology-changing defects, which we name as "genons", can also be defined in other physical systems. We develop methods to compute the projective non-abelian braiding statistics of the genons, and we find the braiding is given by adiabatic modular transformations, or Dehn twists, of the topological state on the effective genus g surface. We find situations where the > genons have quantum dimension 2 and can be used for universal topological quantum computing (TQC), while the host topological state is by itself non-universal for TQC.
Condensed Matter - Lecture 14

Assa Auerbach Technion – Israel Institute of Technology
October 26, 2012

PIRSA:12100039
Condensed Matter
Condensed Matter - Lecture 13

Assa Auerbach Technion – Israel Institute of Technology
October 25, 2012

PIRSA:12100038
Condensed Matter
Condensed Matter - Lecture 12

Assa Auerbach Technion – Israel Institute of Technology
October 24, 2012

PIRSA:12100037
Condensed Matter
Condensed Matter - Lecture 11

Assa Auerbach Technion – Israel Institute of Technology
October 23, 2012

PIRSA:12100036
Condensed Matter
Condensed Matter - Lecture 10

Assa Auerbach Technion – Israel Institute of Technology
October 22, 2012

PIRSA:12100035
Condensed Matter
Self-localization of a single hole in Mott antiferromagnets

Zheng-Yu Weng Tsinghua University
October 19, 2012

PIRSA:12100077
Condensed Matter
Anderson localization - quantum suppression of carrier diffusion due to disorders - is a basic notion of modern condensed matter physics. Here I will talk about a novel localization phenomenon totally contrary to this common wisdom. Strikingly, it is purely of strong interaction origin and occurs without the assistance of disorders. Specifically, by combined numerical (density matrix renormalization group) method and analytic analysis, we show that a single hole injected in a quantum antiferromagnetic ladder is generally self-localized even though the system respects the translational symmetry. The localization length is found to monotonically decrease with the increase of leg number, indicating stronger self-localization in the two-dimensional limit. We find that a peculiar coupling between the doped charge and the quantum spin background causes quantum interference among different hole paths. The latter brings the hole's itinerant motion to a halt, a phenomenological analogy to Anderson localization. Our findings are opposite to the common belief of the quasiparticle picture for the doped hole and unveil a completely new paradigm for lightly doped Mott insulators.
Condensed Matter - Lecture 9

Assa Auerbach Technion – Israel Institute of Technology
October 19, 2012

PIRSA:12100032
Condensed Matter
Condensed Matter - Lecture 8

Assa Auerbach Technion – Israel Institute of Technology
October 18, 2012

PIRSA:12100031
Condensed Matter
Condensed Matter - Lecture 7

Assa Auerbach Technion – Israel Institute of Technology
October 17, 2012

PIRSA:12100030
Condensed Matter
Condensed Matter Seminar

Assa Auerbach Technion – Israel Institute of Technology
October 16, 2012

PIRSA:12100078
Condensed Matter

Title	Speaker(s)	Date	Talk Type	Info link
Superradiant Superconductivity	Baskaran Ganapathy	2012-11-16	Scientific Series	View details
Synthetic non-Abelian anyons in fractional Chern insulators and beyond	Xiaoliang Qi	2012-10-26	Scientific Series	View details
Condensed Matter - Lecture 14	Assa Auerbach	2012-10-26	Course	View details
Condensed Matter - Lecture 13	Assa Auerbach	2012-10-25	Course	View details
Condensed Matter - Lecture 12	Assa Auerbach	2012-10-24	Course	View details
Condensed Matter - Lecture 11	Assa Auerbach	2012-10-23	Course	View details
Condensed Matter - Lecture 10	Assa Auerbach	2012-10-22	Course	View details
Self-localization of a single hole in Mott antiferromagnets	Zheng-Yu Weng	2012-10-19	Scientific Series	View details
Condensed Matter - Lecture 9	Assa Auerbach	2012-10-19	Course	View details
Condensed Matter - Lecture 8	Assa Auerbach	2012-10-18	Course	View details
Condensed Matter - Lecture 7	Assa Auerbach	2012-10-17	Course	View details
Condensed Matter Seminar	Assa Auerbach	2012-10-16	Other	View details

Supported by

Format results

Superradiant Superconductivity

Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Condensed Matter - Lecture 14

Condensed Matter - Lecture 13

Condensed Matter - Lecture 12

Condensed Matter - Lecture 11

Condensed Matter - Lecture 10

Self-localization of a single hole in Mott antiferromagnets

Condensed Matter - Lecture 9

Condensed Matter - Lecture 8

Condensed Matter - Lecture 7

Condensed Matter Seminar

Superradiant Superconductivity

Synthetic non-Abelian anyons in fractional Chern insulators and beyond

Condensed Matter - Lecture 14

Condensed Matter - Lecture 13

Condensed Matter - Lecture 12

Condensed Matter - Lecture 11

Condensed Matter - Lecture 10

Self-localization of a single hole in Mott antiferromagnets

Condensed Matter - Lecture 9

Condensed Matter - Lecture 8

Condensed Matter - Lecture 7

Condensed Matter Seminar