Dynamical Piezoelectric and Magnetopiezoelectric Effects in Polar Metals from Berry Phases and Orbital Moments

Dániel Varjas, Adolfo G. Grushin, Roni Ilan, Joel E. Moore

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)
14 Downloads (Pure)

Abstract

The polarization of a material and its response to applied electric and magnetic fields are key solid-state properties with a long history in insulators, although a satisfactory theory required new concepts such as Berry-phase gauge fields. In metals, quantities such as static polarization and the magnetoelectric θ term cease to be well defined. In polar metals, there can be analogous dynamical current responses, which we study in a common theoretical framework. We find that current responses to dynamical strain in polar metals depend on both the first and second Chern forms, related to polarization and magnetoelectricity in insulators as well as the orbital magnetization on the Fermi surface. We provide realistic estimates that predict that the latter contribution will dominate, and we investigate the feasibility of experimental detection of this effect.

Original languageEnglish
Article number257601
Number of pages6
JournalPhysical Review Letters
Volume117
Issue number25
DOIs
Publication statusPublished - 2016

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