Condensed Matter Seminar

All future


Friday, May 24th 2019
12:20 pm:
Special Condensed Matter Seminar in Physics Tate 301-20
Speaker: Andrey Antipov, Microsoft Station Q
Subject: Engineering Majorana zero modes.

The initial theoretical proposal for the realization of Majorana bounds states in a condensed matter setup requires three simple ingredients: superconductivity, spin-orbit coupling and magnetic field. While this proposal is simple, the experiments are not, as they involve material science, fabrication steps, cooling, electrostatic control and actual measurements. The results of experiments are not unambiguous and allow for multiple interpretation by simple theoretical models. In order to bridge the gap one has to include peculiarities of experimental setup and engineer the modelling of systems supporting Majorana zero modes. In this talk I will show how the next generation of numerical models captures the effects of electric fields, disorder, orbital effects and how it can feedback and guide the ongoing experimental effort in the field.

Faculty Host: Natalia Perkins

Tuesday, May 28th 2019
11:00 am:
Special Condensed Matter Seminar in Physics Tate 201-20
Speaker: Ying-Jer Kao, National Taiwan University
Subject: Gapless spin liquid in the kagome Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interactions

A preponderance of evidence suggests that the ground state of the nearest-neighbor S=1/2 antiferromagnetic Heisenberg model on the kagome lattice is a gapless spin liquid. Many candidate materials for the realization of this model possess in addition a Dzyaloshinskii-Moriya (DM) interaction. We study this system by tensor-network methods and deduce that a weak but finite DM interaction is required to destabilize the gapless spin-liquid state. The critical magnitude, Dc/J≃0.012(2), lies well below the DM strength proposed in the kagome material herbertsmithite, indicating a need to reassess the apparent spin-liquid behavior reported in this system.

Faculty Host: Natalia Perkins

Wednesday, September 25th 2019
1:25 pm:
Speaker: Scott Crooker, Los Alamos National Lab
Subject: TBD
Faculty Host: Paul Crowell

Wednesday, November 13th 2019
1:25 pm:
Speaker: Ana Maria Rey, University of Colorado - Boulder
Subject: TBD

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