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Flavortronics in Transition Metal Dichalcogenides

Date: 2018-06-22
Time: 10:00
Venue: M830
Speaker: Dr. Fan Zhang

Assistant Professor
University of Texas at Dallas

Abstract:The family of atomically thin transition metal dichalcogenides (TMDs) is a rapidly rising star on the horizon of condensed matter physics and has already revealed a number of spin-valley-helicity coupled optical phenomena. More fascinatingly, our recent magnetotransport measurements have provided compelling evidence for the presence of a three-fold Q-valley degeneracy in few-layer n-type TMDs. These Q valleys offer an unprecedented opportunity to realize the solid-state version of flavor SU(3) symmetry that has been rare in electron systems to date and to explore novel electromagnetic phenomena that can arise from the interplay between the emergent symmetry and electron-electron interactions. In this talk, I will discuss our recent experimental progress on quantum transport in few-layer TMDs and our theory of the emergent flavortronics. Particularly, we predict a pure flavor nematic phase and a flavorless charge-density-wave phase. Surprisingly, electrons carry flavor-dependent electric dipole moments even at zero magnetic field, rendering the nematics ferroelectric, allowing electric-field manipulation of the flavors, and leading to the concept of flavortronics.