Excitation spectrum of a mixture of two Bose gases confined in a ring potential with interaction asymmetry
| Autor: | Roussou, A., Smyrnakis, J., Magiropoulos, M., Efremidis, Nikolaos K., Kavoulakis, G. M., Sandin, P., ��gren, M., Gulliksson, M. |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Popis: | We study the rotational properties of a two-component Bose-Einstein condensed gas of distinguishable atoms which are confined in a ring potential using both the mean-field approximation, as well as the method of diagonalization of the many-body Hamiltonian. We demonstrate that the angular momentum may be given to the system either via single-particle, or "collective" excitation. Furthermore, despite the complexity of this problem, under rather typical conditions the dispersion relation takes a remarkably simple and regular form. Finally, we argue that under certain conditions the dispersion relation is determined via collective excitation. The corresponding many-body state, which, in addition to the interaction energy minimizes also the kinetic energy, is dictated by elementary number theory. Published version, 15 pages, 7 figures |
| Databáze: | OpenAIRE |
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