Condensed Matter Physics Seminar (cancelled)
This seminar has been cancelled.
Speaker: Lian Li, West Virginia University
Title: Enhanced Functionalities from Designed vdW Interfaces
Refreshments available at 3:45 pm.
Date: Mon, 10 Sep 2018, 4:10 pm – 5:10 pm
Location: 1400 BPS Bldg.
In his Nobel lecture, Kroemer famously opened with the claim “Often, it may be said that the interface is the device.” Nowhere is this more true than in two-dimensional (2D) materials, whose properties can only be meaningfully discussed when their interfaces with the substrates are clearly defined. The band gap of graphene provides an apt example. It is on the order of μeV while freestanding, but can reach tens of meV on h-BN. Perhaps the most exciting example of substrate dependence in a 2D material is the recent discovery of an order-of-magnitude increase in superconducting transition temperature (TC) when a single layer of FeSe is grown on SrTiO3(001) substrate. In this talk, I will highlight our work on the giant spin-orbit splitting of the graphene Dirac states of up to 80 meV in graphene/topological insulator Bi2Se3 van der Waals (vdW) heterostructure due to indirect interfacial bonding, and the control of TC in single layer FeSe/SrTiO3 by engineering interface reconstruction. Our findings reveal unique opportunities for tailoring physical and electronic properties of 2D materials at vdW interfaces.