Title::InAs/GaSb as a Platform for Condensed Matter Research

 　　Speaker: Prof. Ruirui Du (Rice University)

　  Time: Jan.14,201410:00AM

　　Venue:No. 101 Meeting Room, IOS, CAS 

　　Abstract：InAs/GaSb quantum well and superlattice devices have found wide applications in infrared detection and imaging. On the other hand, recent research work has shown that this material system may play a unique role in the fundamental studies of spin-orbital interaction, topological insulator and superconductors, and novel exciton condensates. In this talk I will briefly discuss materials issues, and describe a few examples: 1) Recent low temperature transport experiments have shown robust helical edge states in inverted InAs/GaSb quantum wells, with quantized conductance plateaus observed at temperatures well above 10 K; 2) Several experiments show clear signals of Andreev reflection and superconductor proximity effect in s-SC contacted edge states, indicating highly transparent interface. Such experimental advances have promoted a great interest in pursuing Majorana fermions in a platform built from InAs/GaSb and s-wave superconductors; and 3) It is theoretically proposed that magnetically-doped InAs/GaSb should exhibit quantum anomalous Hall effect where the chiral edge states can be realized without applying a magnetic field. I will try to provide some perspective of the field.