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.

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.