Orbital magnetism induced by heat currents in Mott insulators.
Phys Rev Lett
; 111(16): 166602, 2013 Oct 18.
Article
em En
| MEDLINE
| ID: mdl-24182288
ABSTRACT
We derive the effective heat current density operator for the strong-coupling regime of Mott insulators. Similarly to the case of the electric current density, the leading contribution to this effective operator is proportional to the local scalar spin chirality χ(jkl)=S(l)·(S(j)×S(k)). This common form of the effective heat and electric current density operators leads to a novel cross response in Mott insulators. A heat current induces a distribution of orbital magnetic moments in systems containing loops of an odd number of hopping terms. The relative orientation of the orbital moments depends on the particular lattice of magnetic ions. This subtle effect arises from the symmetries that the heat and electric currents have in common.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article