Applied Physics B

, Volume 86, Issue 3, pp 385-390

First online:

Nonexponential decay of Bose–Einstein condensates: a numerical study based on the complex scaling method

  • P. SchlagheckAffiliated withInstitut für Theoretische Physik, Universität Regensburg Email author 
  • , S. WimbergerAffiliated withDipartimento di Fisica Enrico Fermi and CNR-INFM, Università degli Studi di Pisa

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We study the decay dynamics of an interacting Bose–Einstein condensate in the presence of a metastable trapping potential from which the condensate can escape via tunneling through finite barriers. The time-dependent decay process is reproduced by means of the instantaneous decay rates of the condensate at a given population of the quasi-bound state, which are calculated with the method of complex scaling. Both for the case of a double-barrier potential as well as for the case of a tilted periodic potential, we find pronounced deviations from a monoexponential decay behavior, which would generally be expected in the absence of the atom–atom interaction.