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
Type: Seminar
Location: 1400 BPS Bldg.

Abstract:
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.