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Valley-Contrasting Physics in Graphene: Magnetic Moment and Topological Transport

Di Xiao, Wang Yao, and Qian Niu
Phys. Rev. Lett. 99, 236809 – Published 7 December 2007

Abstract

We investigate physical properties that can be used to distinguish the valley degree of freedom in systems where inversion symmetry is broken, using graphene systems as examples. We show that the pseudospin associated with the valley index of carriers has an intrinsic magnetic moment, in close analogy with the Bohr magneton for the electron spin. There is also a valley dependent Berry phase effect that can result in a valley contrasting Hall transport, with carriers in different valleys turning into opposite directions transverse to an in-plane electric field. These effects can be used to generate and detect valley polarization by magnetic and electric means, forming the basis for the valley-based electronics applications.

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  • Received 11 September 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.236809

©2007 American Physical Society

Authors & Affiliations

Di Xiao*, Wang Yao*, and Qian Niu

  • Department of Physics, The University of Texas, Austin, Texas 78712-0264, USA

  • *Corresponding authors: dxiao@physics.utexas.edu; wangyao@physics.utexas.edu

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Issue

Vol. 99, Iss. 23 — 7 December 2007

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