Phys. Rev. Lett. 93, 167602 (2004) [4 pages]

Topological Nature of Polarization and Charge Pumping in Ferroelectrics

Abstract

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Shigeki Onoda¹, Shuichi Murakami², and Naoto Nagaosa^1,2,3
¹Spin Superstructure Project, ERATO, Japan Science and Technology Agency, c/o Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
²CREST, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
³Correlated Electron Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8562, Japan

Received 20 March 2004; published 13 October 2004

Electric polarization in insulators is represented by the transferred charge through a shift of the Bloch wave functions induced by an adiabatic change of external parameters Q⃗. It is found that this covalent/quantum contribution is determined nonlocally by the topological structure in the Q⃗ space. The condition for the charge pumping for a cyclic change of Q⃗ is also obtained. Applications of this picture to various organic ferroelectrics and BaTiO₃ are discussed.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.93.167602

DOI:

10.1103/PhysRevLett.93.167602

PACS:

77.84.Jd, 03.65.Vf, 77.22.–d

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Phys. Rev. Lett. 93, 167602 (2004) [4 pages]

Topological Nature of Polarization and Charge Pumping in Ferroelectrics