Quantum top inside a Bose-Einstein-condensate Josephson junction. / Bausmerth, Ingrid ; Fischer, Uwe R.; Posazhennikova, Anna.

In: Physical Review A, Vol. 75, No. 5, 053605, 05.2007.

Research output: Contribution to journalArticlepeer-review



We consider an atomic quantum dot confined between two weakly coupled Bose-Einstein condensates, where the dot serves as an additional tunneling channel. It is shown that the thus-embedded atomic quantum dot is a pseudospin subject to an external torque, and therefore equivalent to a quantum top. We demonstrate by numerical analysis of the time-dependent coupled evolution equations that this microscopic quantum top is very sensitive to any deviation from linear oscillatory behavior of the condensates. For sufficiently strong dot-condensate coupling, the atomic quantum dot can induce or modify the tunneling between the macroscopic condensates in the two wells.
Original languageEnglish
Article number053605
JournalPhysical Review A
Issue number5
Publication statusPublished - May 2007
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

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