TODAY - CMT Seminar - Monday, November 10th - Di Xiao, Carnegie Mellon University - 11:30am, Smith Seminar Room (1080 PRB)

[Longbrake, Patricia]

Please join us TODAY, Monday, November 10th for the Condensed Matter Theory Seminar presented by Di Xiao, Carnegie Mellon University at 11:30am in the Smith Seminar Room (1080 PRB).

TITLE:  "Valleytronics in two-dimensional Dirac materials"

ABSTRACT:  In many crystals the Bloch bands have degenerate but inequivalent energy extrema in the momentum space, known as valleys. The valley index constitutes a well-defined discrete degree of freedom for low-energy carriers that may be used to encode information.  This has led to the concept of valleytronics, a new type of electronics based on manipulating the valley index of carriers.  In this talk, I will describe a general scheme based on inversion symmetry breaking to control the valley index, which is based on the Berry phase effect of massive Dirac electrons.  A number of valley-dependent phenomena, such as valley Hall effect, valley-dependent optical selection rule, spin-valley coupling, optical generation of pure valley current, as well as Berry-phase induced energy splitting of valley excitons will be discussed in realist materials such as graphene and monolayer transition metal dichalcogenides.

Thank you,
Trisch
2-2778
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