Spin-orbit coupling and electronic charge effects in Mott insulators

Zhu, Shan; Li, You -Quan; Batista, Cristian D.

doi:10.1103/PhysRevB.90.195107

Title: Spin-orbit coupling and electronic charge effects in Mott insulators

Journal Article · Tue Nov 04 00:00:00 EST 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.90.195107· OSTI ID:1234260

Zhu, Shan ^[1]; Li, You -Quan ^[1]; Batista, Cristian D. ^[2]

Zhejiang Univ., Hangzhou (People's Republic of China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We derive the effective charge- and current-density operators for the strong-coupling limit of a single-band Mott insulator in the presence of spin-orbit coupling and show that the spin-orbit contribution to the effective charge density leads to novel mechanisms for multiferroic behavior. In some sense, these mechanisms are the electronic counterpart of the ionic-based mechanisms, which have been proposed for explaining the electric polarization induced by spiral spin orderings. In addition, the new electronic mechanisms are illustrated by considering cycloidal and proper-screw magnetic orderings on sawtooth and kagome lattices. As for the isotropic case, geometric frustration is crucial for achieving this purely electronic coupling between spin and charge degrees of freedom.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 11074216; 11274272; AC52-06NA25396; PHYS-1066293

OSTI ID:: 1234260

Alternate ID(s):: OSTI ID: 1180285

Report Number(s):: LA-UR-14-28062; PRBMDO

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 19; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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