Audio / Video

New Topological States of Matter

  • 01:10:40

Description

Topological materials can host Dirac, Majorana and Weyl fermions as emergent excitations. In this talk, we will first briefly overview our recent results on topological insulators and helical superconductors based on topological insulators and consider new frontiers. It is possible to start with a topological insulator and close the gap in such a way that the low-lying bulk excitations emerge as Weyl fermions whereas the surface features non-closed Fermi surfaces resulting in the realization of a new state of topological matter via a topological phase transition. Strong spin-orbit interaction and crystalline symmetries can lead to a strong tilt of the Weyl cone which break Lorentz invariance. We present theoretical and experimental evidence that the LaAlGe materials family host such a state of topological matter. Finally, we present results on a topological nodal-line phase in (Pb/Tl)TaSe2 which also superconducts at low temperatures providing opportunities to investigate the interplay of superconductivity, symmetry and topology leading to a new type of Majorana platform.

Details

Title

New Topological States of Matter

Creator

University of California, Berkeley. Dept. of Physics

Published

Berkeley, CA, University of California, Berkeley, Dept. of Physics, March 6, 2017

Full Collection Name

Physics Colloquia

Type

Video

Format

Lecture.

Extent

1 streaming video file

Other Physical Details

digital, sd., col.

Archive

Physics Library

Note

Recorded at a colloquium held on March 6, 2017, sponsored by the Dept. of Physics, University of California, Berkeley.

originally produced as an .mts file in 2017

Speakers: Zahid Hasan.

Collection

Physics Colloquia

Tracks

colloquia/3-6-17Hasan.mp4 01:10:40

Linked Resources

View record in Digital Collections.