This is a past event. Its details are archived for historical purposes.
The contact information may no longer be valid.
Please visit our current events listings to look for similar events by title, location, or venue.
Monday, September 10, 2018 at 4:00pm to 5:00pm
Rockefeller Hall, Schwartz Auditorium
General Physics Colloquium, Professor Kin Fai Mak, Cornell University
Refreshments from 3:30-3:50 pm.
Title: Path towards Bose-Einstein Condensation of Excitons at High Temperatures
Host: Paul McEuen
Abstract: Excitons, composite Bosons made of Coulomb bound electron-hole pairs, are important objects underlying the operations of many optoelectronics devices in our daily life. As a result of the much smaller exciton mass compared to that of atoms, they also hold great promise in the realization of Bose-Einstein condensation at high temperatures. However, the small exciton binding energy in conventional semiconductors has so far limited the condensation temperature to below 1K. In the past few years, a new class of two-dimensional (2D) semiconductors with much larger exciton binding energy has emerged. In this talk, I will first discuss the measurement of the exciton binding energy in these materials by optical spectroscopy methods. I will then tell you the path we have taken in trying to realize exciton condensation in these materials. Signatures of exciton condensation near 100K have been observed in a recent set of experiments. Prospects of condensate-based optoelectronics will also be discussed.