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

[Longbrake, Patricia]

Please join us on 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.

If you would like to meet with Dr. Xiao during his visit, please contact me for available times.

Thank you,
Trisch
2-2778
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