Momentum spread of spontaneously decaying cold gas in thermal radiation

Marzlin, K.P. and Audretsch, J.R. and Ooi, Chong Heng Raymond (2002) Momentum spread of spontaneously decaying cold gas in thermal radiation. Physical Review A, 66 (6). ISSN 1050-2947, DOI https://doi.org/10.1103/PhysRevA.66.063413.

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Abstract

We study the quantum dynamics of the center-of-mass momentum distribution for the populations of a cold gas with two-level system undergoing spontaneous decay and coupled to a Markovian thermal reservoir at arbitrary temperature. We derive the momentum-convolutionless coupled equations for momentum Fourier transform of the populations which can be easily solved numerically and analytically for a specific internal scheme and for zero-temperature cases. The time and momentum evolutions of the populations are obtained by inverse Fourier transform. The momentum spread and the center-of-mass entropy across one momentum dimension are computed and compared for different internal schemes, between zero-temperature and finite-temperature cases and between pi and sigma(+/-) transitions. For initial subrecoil momentum width, the sigma(+/-) transition displays a two-peak feature. Our results well describe the momentum spread dynamics of cold gas in thermal radiation at early: time and complement the results based on Fokker-Planck equation.

Item Type:	Article
Funders:	UNSPECIFIED
Additional Information:	Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords:	Laser
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Department of Physics
Depositing User:	Miss Malisa Diana
Date Deposited:	08 Jul 2013 09:43
Last Modified:	09 Oct 2019 00:47
URI:	http://eprints.um.edu.my/id/eprint/7925

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