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Phase diagrams of the Bose-Hubbard model at finite temperature
The phase transitions in the Bose-Hubbard model are investigated. A single-particle Green's function is calculated in the random phase approximation and the formalism of the Hubbard operators is used. The regions of existence of the superfluid and Mott insulator phases are established and the...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2009
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/120322 |
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| Summary: | The phase transitions in the Bose-Hubbard model are investigated. A single-particle Green's function is calculated
in the random phase approximation and the formalism of the Hubbard operators is used. The regions of
existence of the superfluid and Mott insulator phases are established and the (μ, t) (the chemical potential
transfer parameter) phase diagrams are built. The effect of temperature change on this transition is analyzed
and the phase diagram in the (T, μ) plane is constructed. The role of thermal activation of the ion hopping is
investigated by taking into account the temperature dependence of the transfer parameter. The reconstruction
of the Mott-insulator lobes due to this effect is analyzed. |
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