Condensed Matter & Surface Sciences

COLLOQUIUM

Yogesh Joglekar

Indiana University – Purdue University

Indianapolis

“Superfluid and crystalline phases

of excitonic condensates in electron-hole bilayers”

Bose-Einstein condensation (BEC) is a remarkable consequence of quantum statistical mechanics. Bilayer electron-hole systems are expected to form excitonic BEC when the distance between the layers is smaller than the typical distance between particles within a layer. Semiconductor double quantum wells and graphene are two promising candidates for its realization. I will discuss the zero-temperature phase diagram of a bilayer system and focus on uniform and crystalline excitonic condensate phases. I will present predictions for properties of the uniform condensate, including superfluidity, and show how these properties change when the system changes from a uniform state to crystalline excitonic condensate.

Thursday, October 22, 2009

4:10 p.m. -- Walter Lecture Hall 245