Abstract
We consider nonlinear spectroscopic effects—interaction-enhanced double resonance and spectrum instability—that appear in ultracold quantum gases owing to collisional frequency shift of atomic transitions and, consequently, due to the dependence of the frequencies on the population of various internal states of the particles. Special emphasis is put to two simplest cases, (a) the gas of two-level atoms and (b) double resonance in a gas of three-level bosons, in which the probe transition frequency remains constant.
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Original Russian Text © A.I. Safonov, I.I. Safonova, I.S. Yasnikov, 2013, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2013, Vol. 143, No. 5, pp. 856–864.
The article is based on a preliminary report delivered at the 36th Conference on Low Temperature Physics (St. Petersburg, July 2–6, 2012) and was translated by the authors.
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Safonov, A.I., Safonova, I.I. & Yasnikov, I.S. Nonlinear spectroscopic effects in quantum gases induced by atom-atom interactions. J. Exp. Theor. Phys. 116, 742–748 (2013). https://doi.org/10.1134/S1063776113050233
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DOI: https://doi.org/10.1134/S1063776113050233