Annual meeting of the Swiss Physical Society 2018

【613】 Reinvestigating the surface and bulk electronic properties of Cd3As2

31 Aug 2018, 12:00

15m

CE 2 (EPFL)

Talk Advances in Topological Materials Advances in Topological Materials

Speaker

Dr Alberto Crepaldi (Institute of Physics, Ecole Polytechnique F\'ed\'erale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)

Description

Cd3As2 is generally considered as archetype of the three-dimensional Dirac semimetal phase, the 3D analogue of graphene with linearly dispersing bulk state. Our reinvestigation of its electronic properties calls for a revision of this simplistic description. Cd3As2 exhibits, in fact, both a surface state and two bulk bands, dispersing across the Fermi level. Hence, these states must all contribute to the unique material electrical transport properties, but with very different effective masses and band velocities.
Hence, Cd3As2 displays a very different behavior in the bulk and at surface, and this has to be carefully considered in order to deepen our comprehension of its transport properties, in the perspective of developing novel devices.