Diagnostics of macroscopic quantum states of Bose–Einstein condensate in double-well potential by nonstationary Josephson effect

Diagnostics of macroscopic quantum states of Bose–Einstein condensate in double-well potential by nonstationary Josephson effect

Тема: Квантовые жидкости и квантовые кpисталлы

Інший ID: PACS: 03.75.Fi, 05.30.Jp

URI: http://dspace.nbuv.gov.ua/handle/123456789/120776

Посилання: Diagnostics of macroscopic quantum states of Bose–Einstein condensate in double-well potential by nonstationary Josephson effect / E.D. Vol // Физика низких температур. — 2005. — Т. 31, № 2. — С. 131-133. — Бібліогр.: 7 назв. — англ.

Підтримка: I would like to acknowledge R.I. Shekhter, S.I. Shevchenko, and D.V. Fil for discussion of the results presented in this article. This work is supported by INTAS Grant No 01-2344.

Дата: 2005

Завантажень: 305

Diagnostics of macroscopic quantum states of Bose–Einstein condensate in double-well potential by nonstationary Josephson effect

Анотація:

We propose a method of diagnostics of a degenerate ground state of Bose condensate in a double- well potential. The method is based on the study of the one-particle coherent tunneling under switching of the time-dependent weak Josephson coupling between the wells. We obtain a simple expression that allows one to determine the phase of the condensate and the total number of the particles in the condensate from the relative number of particles in the two wells Δn = n₁ - n₂ measured before the Josephson coupling is switched on and after it is switched off. The specifics of the application of the method in the cases of the external and the internal Josephson effect are discussed.

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