Department of Physics

Indian Institute Of Technology Madras , Chennai

Two-dimensional excitons in layered materials and their heterojunctions

Speaker : Dr. Kausik Majumdar, Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore 560 012

2019-02-07

Abstract :

In this talk, I shall discuss the multiple exciton states observed in the monolayers of transition-metal dichalcogenides. These near-two-dimensional exciton states are markedly different from typical exciton states observed in three-dimensional bulk semiconductors and their quantum wells, in terms of binding energy and spontaneous emission rate. This makes these monolayers an ideal platform to study exciton physics. With an increase in the number of layers, the band structure is modified significantly, modulating the exciton states and giving rise to unique layer degree of freedom of excitons. Monolayers being atomically thin, these exciton states can be manipulated by the surrounding dielectric environment. The implications of charge and energy transfer in vertical layered heterojunction will be discussed.

Key Speaker Dr. Kausik Majumdar, Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore 560 012
Guests None
Place Seminar Room
Start Time 3:00 PM
Finish Time 4:00 PM
External Link None