The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation
The Bose-Einstein condensation in the hard-core boson limit (HCB) of the Bose-Hubbard model with two local states and the particle hopping in the excited band only is investigated. For the purpose of considering the non-ergodicity, a single-particle spectral density is calculated in the random phase...
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| Format: | Article |
| Language: | English |
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Institute for Condensed Matter Physics
2012-10-01
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| Series: | Condensed Matter Physics |
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| Online Access: | http://dx.doi.org/10.5488/CMP.15.33002 |
| _version_ | 1819065199352610816 |
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| author | I.V. Stasyuk O.V. Velychko |
| author_facet | I.V. Stasyuk O.V. Velychko |
| author_sort | I.V. Stasyuk |
| collection | DOAJ |
| description | The Bose-Einstein condensation in the hard-core boson limit (HCB) of the Bose-Hubbard model with two local states and the particle hopping in the excited band only is investigated. For the purpose of considering the non-ergodicity, a single-particle spectral density is calculated in the random phase approximation by means of the temperature boson Green functions. The non-ergodic contribution to the momentum distribution function of particles (connected with the static density fluctuations) increases significantly and becomes comparable with the ergodic contribution in the superfluid phase near the tricritical point. |
| first_indexed | 2024-12-21T15:42:40Z |
| format | Article |
| id | doaj.art-5cab86bc9c964fcc92b29da564f223d7 |
| institution | Directory Open Access Journal |
| issn | 1607-324X |
| language | English |
| last_indexed | 2024-12-21T15:42:40Z |
| publishDate | 2012-10-01 |
| publisher | Institute for Condensed Matter Physics |
| record_format | Article |
| series | Condensed Matter Physics |
| spelling | doaj.art-5cab86bc9c964fcc92b29da564f223d72022-12-21T18:58:28ZengInstitute for Condensed Matter PhysicsCondensed Matter Physics1607-324X2012-10-0115333002The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensationI.V. StasyukO.V. VelychkoThe Bose-Einstein condensation in the hard-core boson limit (HCB) of the Bose-Hubbard model with two local states and the particle hopping in the excited band only is investigated. For the purpose of considering the non-ergodicity, a single-particle spectral density is calculated in the random phase approximation by means of the temperature boson Green functions. The non-ergodic contribution to the momentum distribution function of particles (connected with the static density fluctuations) increases significantly and becomes comparable with the ergodic contribution in the superfluid phase near the tricritical point.http://dx.doi.org/10.5488/CMP.15.33002Bose-Hubbard modelhard-core bosonsBose-Einstein condensationexcited bandnon-ergodicity |
| spellingShingle | I.V. Stasyuk O.V. Velychko The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation Condensed Matter Physics Bose-Hubbard model hard-core bosons Bose-Einstein condensation excited band non-ergodicity |
| title | The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation |
| title_full | The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation |
| title_fullStr | The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation |
| title_full_unstemmed | The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation |
| title_short | The two-state Bose-Hubbard model in the hard-core boson limit: Non-ergodicity and the Bose-Einstein condensation |
| title_sort | two state bose hubbard model in the hard core boson limit non ergodicity and the bose einstein condensation |
| topic | Bose-Hubbard model hard-core bosons Bose-Einstein condensation excited band non-ergodicity |
| url | http://dx.doi.org/10.5488/CMP.15.33002 |
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