Repository logo
 

Topological phonons in oxide perovskites controlled by light

Published version
Peer-reviewed

Type

Article

Change log

Authors

Monserrat Sanchez, Bartomeu 

Abstract

Perovskite oxides exhibit a rich variety of structural phases hosting different physical phenomena that generate multiple technological applications. We find that topological phonons – nodal rings, nodal lines, and Weyl points – are ubiquitous in oxide perovskites in terms of structures (tetragonal, orthorhombic, rhombohedral), compounds (BaTiO3, PbTiO3, SrTiO3), and external conditions (photoexcitation, strain, temperature). In particular, in the tetragonal phase of these compounds all types of topological phonons can simultaneously emerge when stabilized by photoexcitation, whereas the tetragonal phase stabilized by thermal fluctuations only hosts a more limited set of topological phonon states. Additionally, we find that the photoexcited carrier concentration can be used to tune the topological phonon states and induce topological transitions even without associated structural phase changes. Overall, we propose oxide perovskites as a versatile platform in which to study topological phonons and their manipulation with light.

Description

Keywords

34 Chemical Sciences, 51 Physical Sciences, 5104 Condensed Matter Physics

Journal Title

Science advances

Conference Name

Journal ISSN

2375-2548
2375-2548

Volume Title

6

Publisher

American Association for the Advancement of Science
Sponsorship
Engineering and Physical Sciences Research Council (EP/R512461/1)
EPSRC (1943724)
Engineering and Physical Sciences Research Council (EP/P020259/1)