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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