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- W2801014771 abstract "We show that roton-like excitations are thermally induced in a two-dimensional dilute Bose gas as a consequence of the strong phase fluctuations in two dimensions. At low momentum, the roton-like excitations lead for small enough temperatures to an anomalous phonon spectrum with a temperature dependent exponent reminiscent of the Kosterlitz-Thouless transition. Despite the anomalous form of the energy spectrum, it is shown that the corresponding effective theory of vortices describes the usual Kosterlitz-Thouless transition. The possible existence of an anomalous normal state in a small temperature interval is also discussed." @default.
- W2801014771 created "2018-05-17" @default.
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- W2801014771 date "2005-03-21" @default.
- W2801014771 modified "2023-09-27" @default.
- W2801014771 title "Thermally induced rotons in two-dimensional dilute Bose gases and the Kosterlitz-Thouless transition to an anomalous normal state" @default.
- W2801014771 hasPublicationYear "2005" @default.
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