Ramsey-like fringes observation during excitation of coherent modes in a Bose-Einstein condensate

✍ Scribed by E.R.F. Ramos; L. Sanz; V.I. Yukalov; V.S. Bagnato

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 162 KB
• Volume: 790
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2007.03.025

✦ Synopsis

In this work we analyse the excitation of coherent modes for different modalities for the time domain application of the external excitation. We have employed a single pulse excitation or a double pulse excitation. The population dynamic was analysed as a function of the frequency detuning between the modes energy separation and the external field frequency. For a single pulse, a Rabi like resonance profile was observed with maximum population transfer off resonance due to the strong non-linearity in the system. Lineshape as well as amplitudes are analysed. For a double pulse excitation, the occurrence of probbability interference generates a Ramsey-fringe like resonance with a considerable narrowing of the central line. Such profile has been investigated as a function of the delay between pulses revealing a dependence of the fringes distribution. It is found that the Ramsey pattern itself retains information about the accumulated relative phase between both ground and excited coherent modes.