Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential
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| Creator |
Fil, D.V.
Shevchenko, S.I. |
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| Subject |
Quantum fluids
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| Description |
We develop an approach for a description of collective excitations in a two-dimensional gas of interacting Bose particles in an external potential. We present a method of finding an approximate analytical solution for the spectra of collective excitations of a Bose gas in a linear potential and in a potential of the form u(r)=m-u₀cosh²x/l, where m is the chemical potential. Numerical study shows that the analytical solution corresponds to collective modes localized at the edge or at the low-density region. We investigate the influence of the external potential on a critical velocity of a superfluid flow. It is shown that the effect of strong suppression of the critical velocity takes place in a nonuniform Bose system. We discuss a possibility of Bose-Einstein condensation (BEC) in the systems under investigations at nonzero temperatures and find that in case of a finite number of the particles BEC can emerge.
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| Date |
2015-04-09T16:47:19Z
2015-04-09T16:47:19Z 2001 |
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| Type |
Article
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| Identifier |
Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential / D.V. Fil, S.I. Shevchenko // Вопросы атомной науки и техники. — 2001. — № 6. — С. 365-369. — Бібліогр.: 15 назв. — англ.
1562-6016 PACS: O3.75.Fi http://dspace.nbuv.gov.ua/handle/123456789/80052 |
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| Language |
en
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| Relation |
Вопросы атомной науки и техники
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| Publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
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