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Physical Review Letters

Comment on “Electromagnetic Wave Dynamics in Matter-Wave Superradiant Scattering”

Wolfgang Ketterle

Published Mar 15, 2011• 6 citations
Publisher

Abstract

A Comment on the Letter by L. Deng, M. G. Payne, and E. W. Hagley, Phys. Rev. Lett. 104 050402 (2010). The authors of the Letter offer a Reply.
DOI
10.1103/physrevlett.106.118901

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Comment on the paper "Electromagnetic Wave Dynamics in Matter-Wave Superradiant Scattering" by L. Deng, M.G. Payne, and E.W. Hagley

Wolfgang Ketterle

The paper by Deng et al. (Phys. Rev. Lett. 104, 050402 (2010)) presents an analytic theoretical description of matter-wave superradiance (Phys. Rev. Lett. 85, 4225-4228 (2000)) which claims to go beyond previous theoretical frameworks. I show here that the theory presented in this paper is not a description of superradiance per se, but rather an elegant perturbative description of a Raman amplifier far away from the superradiant threshold. As such, it merely is a limiting case of previously known treatments of superradiance. Two additional new findings of the paper are incorrect: (1) The claim that adiabatic elimination of the excited state of the atoms is only possible when the probe pulse propagates slowly. (2) The prediction that superradiance has a dependence on the sign of the detuning of the pump laser due to a phase-matching condition.

arXiv:1010.3915•Oct 19, 2010•0 citations

Reply to “Comment on “Role of matter interactions in superradiant phenomena””

J. P. Mendonça, K. Jachymski, Y. Wang

Physical Review Letters•Oct 26, 2026•0 citations
The paper by Deng et al. (Phys. Rev. Lett. 104, 050402 (2010)) presents an analytic theoretical description of matter-wave superradiance (Phys. Rev. Lett. 85, 4225-4228 (2000)) which claims to go beyond previous theoretical frameworks. I show here that the theory presented in this paper is not a description of superradiance per se, but rather an elegant perturbative description of a Raman amplifier far away from the superradiant threshold. As such, it merely is a limiting case of previously known treatments of superradiance. Two additional new findings of the paper are incorrect: (1) The claim that adiabatic elimination of the excited state of the atoms is only possible when the probe pulse propagates slowly. (2) The prediction that superradiance has a dependence on the sign of the detuning of the pump laser due to a phase-matching condition.