Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential
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...
Збережено в:
| Дата: | 2001 |
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| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Назва видання: | Вопросы атомной науки и техники |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/80052 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-800522015-04-10T03:03:07Z Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential Fil, D.V. Shevchenko, S.I. Quantum fluids 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. 2001 Article 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 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Quantum fluids Quantum fluids |
| spellingShingle |
Quantum fluids Quantum fluids Fil, D.V. Shevchenko, S.I. Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential Вопросы атомной науки и техники |
| 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. |
| format |
Article |
| author |
Fil, D.V. Shevchenko, S.I. |
| author_facet |
Fil, D.V. Shevchenko, S.I. |
| author_sort |
Fil, D.V. |
| title |
Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential |
| title_short |
Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential |
| title_full |
Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential |
| title_fullStr |
Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential |
| title_full_unstemmed |
Collective excitations and superfluid properties of a two-dimensional interacting Bose gas in an external potential |
| title_sort |
collective excitations and superfluid properties of a two-dimensional interacting bose gas in an external potential |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2001 |
| topic_facet |
Quantum fluids |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/80052 |
| citation_txt |
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. |
| series |
Вопросы атомной науки и техники |
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AT fildv collectiveexcitationsandsuperfluidpropertiesofatwodimensionalinteractingbosegasinanexternalpotential AT shevchenkosi collectiveexcitationsandsuperfluidpropertiesofatwodimensionalinteractingbosegasinanexternalpotential |
| first_indexed |
2023-10-18T19:20:07Z |
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2023-10-18T19:20:07Z |
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1796146636012912640 |