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October 11, 2018 | 3:30 p.m. - 4:45 p.m.
Category: Seminar
Location: Physics Building #245 | Map
666 W. Hancock
Detroit, MI 48201
Cost: Free

Putting Things on Top of Other Things

(Proximity effects in 2D materials)

Sergio E. Ulloa

Department of Physics and Astronomy and

Ohio Materials Institute

Ohio University

Proximity effects such as those produced when depositing graphene on a transition metal dichalcogenide substrate are expected to change the dynamics of the electronic states in graphene, inducing spin orbit coupling and staggered potential effects.  Putting things on top of other things is promising and going strong in 2D materials!

In this talk, I will describe some of the expectations of combining different layered materials.  In particular, I will show how an effective Hamiltonian that describes different symmetry breaking terms in graphene, while preserving time reversal invariance, shows that a new topological insulator may be created by stacking “trivial” materials and applying strong electric fields.  These new systems may exhibit quantum spin Hall and valley Hall effects in different conditions [1].


 [1] A.M. Alsharari, M.M. Asmar and S.E. Ulloa, Phys. Rev. B 94, 241106(R) (2016); and Phys. Rev. B 97, 241104(R) (2018).


For more information about this event, please contact Zhixian Zhou at 3135772751 or