2015 CAP Congress / Congrès de l'ACP 2015

Interplay of charge density waves and superconductivity

16 Jun 2015, 09:15

30m

NINT Taylor room (University of Alberta)

Invited Speaker / Conférencier invité Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) T1-1 Superconductivity (DCMMP) / Supraconductivité (DPMCM)

Speaker

Kaori Tanaka (University of Saskatchewan)

Description

We examine possible coexistence or competition between charge density waves (CDW) and superconductivity (SC) in terms of the extended Hubbard model. The effects of band structure, filling factor, and electron-phonon interactions on CDW are studied in detail. In particular, we show that van Hove singularities per se can lead to the formation of CDW, due to a substantial energy gain by electron-phonon coupling. While this is contrary to the conventional view that CDW are caused by nesting of Fermi surfaces, it is consistent with recent experimental findings.