Energy relaxation of quantum dot hot electrons in hybrid quantum dot-Bose-Einstein condensate system

M M Mahmoodian; V M Kovalev; A V Chaplik

doi:10.1088/1361-648X/ac18f3

Energy relaxation of quantum dot hot electrons in hybrid quantum dot-Bose-Einstein condensate system

J Phys Condens Matter. 2021 Aug 12;33(43). doi: 10.1088/1361-648X/ac18f3.

Authors

M M Mahmoodian^{1

2}, V M Kovalev^{1

3}, A V Chaplik^{1

2}

Affiliations

¹ A V Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia.
² Novosibirsk State University, Novosibirsk 630090, Russia.
³ Novosibirsk State Technical University, Novosibirsk 630073, Russia.

PMID: 34325409
DOI: 10.1088/1361-648X/ac18f3

Abstract

The theory of electron energy relaxation in a hybrid structure consisting of quantum dot interacting with a two dimensional exciton gas in Bose-Einstein condensate (BEC) regime is developed. A new type of the relaxation mechanism in the presence of BEC is introduced and theoretically analyzed. It is shown that, in the first order of electron-exciton interaction, two microscopic processes of energy relaxation appear. The first one is related to the emission of a single Bogoliubov excitation (bogolon) by an electron, whereas the second process is associated with the emission of two bogolons. It is shown that the second type processes dominate in the QD electron energy relaxation.

Keywords: Bose–Einstein condensate; bogolon; electron-exciton interaction; energy relaxation; quantum dot.