Multicomponent electron-hole superfluidity in double layer systems

Date: 26 February 2019

Venue: Campus Groenenborger, Building U, Room 244 - Groenenborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM - 5:00 PM

Organization / co-organization: CMT

Short description: CMT lecture presented by Sara Conti, CMT

There have been intense efforts to observe excitonic superfluidity in bilayer electron-hole systems. With a Coulomb interaction to generate pairing between electrons and holes, there are predictions of room-temperature superfluidity in such systems. These include double quantum wells in GaAs-AlGaAs heterostructures, double graphene monolayers, hybrid graphene-GaAs structures, double bilayer graphene, double phosporine monolayer and double TMD layer. 

Some of these systems require a multicomponent superfluidity theory because of the nature of the material. I will focus in this seminar on double bilayer graphene system, that presents unique features, such us the small band gap which can be open and controlled between conduction and valence band and the Mexican hat band dispersion.