IQIM Postdoctoral and Graduate Student Seminar

Series: IQIM Postdoctoral and Graduate Student Seminar Series

Fermi Arcs and Their Topological Character in the Candidate Type-II Weyl Semimetals WTe2 and MoTe2

Flavio Yair Bruno, Ambizione Research Fellow, University of Geneva,

Abstract: Recent theoretical work predicts that WTe₂ and MoTe₂ are examples of type - II Weyl semimetals, a new phase of matter hosting Weyl fermions as low energy excitations. The type – II Weyl points are connected by arc-shaped features, known as Fermi arcs, which can be observed with angle-resolved photoemission spectroscopy (ARPES). In this talk I will present a unifying picture of the surface and bulk electronic structure of WTe₂ and MoTe₂. This is achieved by combining laser and synchrotron based ARPES measurements with surface band structure calculations. In both materials we observe arc-like surface states "Fermi-arcs". I will discuss the robustness of the identified Weyl semimetal state and the topological character of the Fermi arcs based on systematic electronic structure calculations simulating different Weyl point arrangements.

F.Y. Bruno, et al, Phys Rev B 94, 121112(R) (2016)

A. Tamai, F.Y. Bruno, et al, Phys Rev X, 6, 031021 (2016)

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For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at [email protected].