Condensed Matter

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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
Condensed Matter - Lecture 6

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

PIRSA:12100029
Condensed Matter
Condensed Matter - Lecture 5

Assa Auerbach Technion – Israel Institute of Technology
October 15, 2012

PIRSA:12100028
Condensed Matter
Condensed Matter - Lecture 4

Assa Auerbach Technion – Israel Institute of Technology
October 12, 2012

PIRSA:12100025
Condensed Matter
Condensed Matter - Lecture 3

Assa Auerbach Technion – Israel Institute of Technology
October 11, 2012

PIRSA:12100024
Condensed Matter
Condensed Matter - Lecture 2

Assa Auerbach Technion – Israel Institute of Technology
October 10, 2012

PIRSA:12100023
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

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
Condensed Matter - Lecture 6

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

PIRSA:12100029
Condensed Matter
Condensed Matter - Lecture 5

Assa Auerbach Technion – Israel Institute of Technology
October 15, 2012

PIRSA:12100028
Condensed Matter
Condensed Matter - Lecture 4

Assa Auerbach Technion – Israel Institute of Technology
October 12, 2012

PIRSA:12100025
Condensed Matter
Condensed Matter - Lecture 3

Assa Auerbach Technion – Israel Institute of Technology
October 11, 2012

PIRSA:12100024
Condensed Matter
Condensed Matter - Lecture 2

Assa Auerbach Technion – Israel Institute of Technology
October 10, 2012

PIRSA:12100023
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.

Title	Speaker(s)	Date	Talk Type	Info link
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
Condensed Matter - Lecture 6	Assa Auerbach	2012-10-16	Course	View details
Condensed Matter - Lecture 5	Assa Auerbach	2012-10-15	Course	View details
Condensed Matter - Lecture 4	Assa Auerbach	2012-10-12	Course	View details
Condensed Matter - Lecture 3	Assa Auerbach	2012-10-11	Course	View details
Condensed Matter - Lecture 2	Assa Auerbach	2012-10-10	Course	View details
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

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Self-localization of a single hole in Mott antiferromagnets

Condensed Matter - Lecture 9

Condensed Matter - Lecture 8

Condensed Matter - Lecture 7

Condensed Matter Seminar

Condensed Matter - Lecture 6

Condensed Matter - Lecture 5

Condensed Matter - Lecture 4

Condensed Matter - Lecture 3

Condensed Matter - Lecture 2

Condensed Matter - Lecture 1

Effect of thermal fluctuations in topological p-wave superconductors

Self-localization of a single hole in Mott antiferromagnets

Condensed Matter - Lecture 9

Condensed Matter - Lecture 8

Condensed Matter - Lecture 7

Condensed Matter Seminar

Condensed Matter - Lecture 6

Condensed Matter - Lecture 5

Condensed Matter - Lecture 4

Condensed Matter - Lecture 3

Condensed Matter - Lecture 2

Condensed Matter - Lecture 1

Effect of thermal fluctuations in topological p-wave superconductors