Abstract
The spectrum shape of atomic radiation in the case of ideal Bose–Einstein condensate (BEC) excited by quantized light is derived through the Wigner–Weisskopf approximation. Besides the split and gap in the excitation spectrum, a doublet structure appears in the emission spectrum with different widths for the non-resonant case and the same widths for the resonant case. The survival probability is found to decrease exponentially for the non-resonant case and with oscillation for the resonant case. A suppressed radiation also appears in the non-resonant case. All these results can be used to detect the existence of BE condensation.
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