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Department of Physics Colloquium

Monday, September 10, 2018 at 4:00pm to 5:00pm

Rockefeller Hall, Schwartz Auditorium
Central Campus

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.

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Physics, Applied and Engineering Physics


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Sue Sullivan

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Professor Kin Fai Mak

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Cornell University

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