Superradiant emission in a high-mobility two-dimensional electron gas

B Barman; A G Linn; A L O'Beirne; J Holleman; C Garcia; V Mapara; J L Reno; S A McGill; V Turkowski; D Karaiskaj; D J Hilton

doi:10.1088/1361-648X/acce8c

Superradiant emission in a high-mobility two-dimensional electron gas

J Phys Condens Matter. 2023 Apr 28;35(30). doi: 10.1088/1361-648X/acce8c.

Authors

B Barman^{1

2}, A G Linn², A L O'Beirne², J Holleman³, C Garcia³, V Mapara⁴, J L Reno⁵, S A McGill³, V Turkowski⁶, D Karaiskaj⁴, D J Hilton⁷

Affiliations

¹ College of Innovation and Technology, University of Michigan-Flint, Flint, MI 48502, United States of America.
² Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294-1170, United States of America.
³ National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 30201, United States of America.
⁴ Department of Physics, University of South Florida, Tampa, FL 33620, United States of America.
⁵ Center for Integrated Nanotechnologies, Sandia National Laboratory, Albuquerque, NM 87185, United States of America.
⁶ Department of Physics, University of Central Florida, Orlando, FL 32816, United States of America.
⁷ Department of Physics, Baylor University, Waco, TX 76798-7316, United States of America.

PMID: 37075774
DOI: 10.1088/1361-648X/acce8c

Abstract

We use terahertz time-domain spectroscopy to study gallium arsenide two-dimensional electron gas samples in external magnetic field. We measure cyclotron decay as a function of temperature from 0.4 to10Kand a quantum confinement dependence of the cyclotron decay time belowT0=1.2K. In the wider quantum well, we observe a dramatic enhancement in the decay time due to the reduction in dephasing and the concomitant enhancement of superradiant decay in these systems. We show that the dephasing time in 2DEG's depends on both the scatteringrateand also on the distribution of scattering angles.

Keywords: cyclotron resonance spectroscopy; dicke superradiant emission; many-body effects; quantum well; two-dimensional electron gas.