Stability and stabilization of unstable condensates

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Abstract

It is possible to condense a macroscopic number of bosons into a single mode. Adding interactions the question arises whether the condensate is stable. For repulsive interaction the answer is positive with regard to the ground-state, but what about a condensation in an excited mode? We discuss some results that have been obtained for a 2-mode bosonic Josephson junction, and for a 3-mode minimal-model of a superfluid circuit. Additionally, we mention the possibility to stabilize an unstable condensate by introducing periodic or noisy driving into the system: this is due to the Kapitza and the Zeno effects.

Original languageEnglish
Article number014032
JournalPhysica Scripta
Volume2015
Issue numberT165
DOIs
StatePublished - 7 Oct 2015
EventFrontiers of Quantum and Mesoscopic Thermodynamics, FQMT 2013 - Prague, Czech Republic
Duration: 29 Jul 20133 Aug 2013

Keywords

  • Bose-Hubbard
  • Kapitza
  • Zeno
  • condensation
  • quantum chaos
  • stability
  • superuidity

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