期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
卷 46, 期 27, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/46/27/275307
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资金
- National Institute for Theoretical Physics (NITheP), Western Cape, South Africa
We consider the model of a PT-symmetric Bose-Einstein condensate in a delta-function double-well potential. We demonstrate that analytic continuation of the primarily non-analytic term vertical bar psi vertical bar(2)psi-occurring in the underlying Gross-Pitaevskii equation-yields new branch points where three levels coalesce. We show numerically that the new branch points exhibit the behaviour of exceptional points of second and third order. A matrix model which confirms the numerical findings in analytic terms is given.
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