Condensed Matter, abstract
cond-mat/0505518
From: Timo Thonhauser [view email]
Date: Fri, 20 May 2005 15:38:35 GMT (22kb)
Orbital magnetization in periodic insulators
Authors:
T. Thonhauser,
Davide Ceresoli,
David Vanderbilt,
R. Resta
Comments: submitted to PRL
Subj-class: Materials Science; Mesoscopic Systems and Quantum Hall Effect
Working in the Wannier representation, we derive an expression for the
orbital magnetization of a periodic insulator. The magnetization is shown to be
comprised of two contributions, an obvious one associated with the internal
circulation of bulk-like Wannier functions in the interior, and an unexpected
one arising from net currents carried by Wannier functions near the surface.
Each contribution can be expressed as a bulk property in terms of Bloch
functions in a gauge-invariant way. Our expression is verified by comparing
numerical tight-binding calculations for finite and periodic samples.
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