Physics – Condensed Matter – Materials Science
Scientific paper
2007-09-09
Phys. Rev. Lett. 99, 236809 (2007)
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevLett.99.236809
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 so-called valley-tronics applications.
Niu Qian
Xiao Di
Yao Wang
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