Various nodal line semimetals

Datum

26.07.2017

Zeit

14:00 - 15:00

Sprecher

Po-Yao Chang

Zugehörigkeit

Rutgers, The State University of New Jersey

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Beschreibung

Nodal line semimetals are the new members of topological semimetallic phases, additional to Weyl semimetals . They have richer structures which can form networks, carry additional textures, and even create links and knots. In this talk, I will focus on two cases of nodal line semimetals. In the first case, two-fold degenerate gapless points form linked rings are introduced. We show the Gauss-linking number can be computed from the Chern-Simons 3-form from a concrete two-band model with two linked nodal lines. In addition, we show Landau level spectrum can provide a way of detecting the linked nodal lines. In the second case, we demonstrate there are three types of nodal rings based on their energy dispersion. Carbon networks provide a realization of these three types of nodal rings. The diverse of electron-hole pocket patterns and Landau levels in these three types of nodal rings can give rise to exotic transport properties.

Letztmalig verändert: 26.07.2017, 09:42:39