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Dynamical piezoelectric and magnetopiezoelectric effects in polar metals from Berry phases and orbital moments | | Daniel Varjas
; Adolfo G. Grushin
; Roni Ilan
; Joel E. Moore
; | | Date: |
18 Jul 2016 | | 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
magnetoelectric $ heta$-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 investigate the feasibility of
experimental detection of this effect. | | Source: | arXiv, 1607.5278 | | Services: | Forum | Review | PDF | Favorites | |
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