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- W3102565597 abstract "Generalized Bose-Einstein condensation (GBEC) involves condensates appearing simultaneously in multiple states. We review examples of the three types in an ideal Bose gas with different geometries. In Type I there is a discrete number of quantum states each having macroscopic occupation; Type II has condensation into a continuous band of states, with each state having macroscopic occupation; in Type III each state is microscopically occupied while the entire condensate band is macroscopically occupied. We begin by discussing Type I or normal BEC into a single state for an isotropic harmonic oscillator potential. Other geometries and external potentials are then considered: the {}channel potential (harmonic in one dimension and hard-wall in the other), which displays Type II, the {}cigar trap (anisotropic harmonic potential), and the Casimir prism (an elongated box), the latter two having Type III condensations. General box geometries are considered in an appendix. We particularly focus on the cigar trap, which Van Druten and Ketterle first showed had a two-step condensation: a GBEC into a band of states at a temperature $T_{c}$ and another one-dimensional transition at a lower temperature $T_{1}$ into the ground state. In a thermodynamic limit in which the ratio of the dimensions of the anisotropic harmonic trap is kept fixed, $T_{1}$ merges with the upper transition, which then becomes a normal BEC. However, in the thermodynamic limit of Beau and Zagrebnov, in which the ratio of the boundary lengths increases exponentially, $T_{1}$ becomes fixed at the temperature of a true Type I phase transition. The effects of interactions on GBEC are discussed and we show that there is evidence that Type III condensation may have been observed in the cigar trap." @default.
- W3102565597 created "2020-11-23" @default.
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- W3102565597 date "2011-10-25" @default.
- W3102565597 modified "2023-10-17" @default.
- W3102565597 title "Generalized Bose–Einstein Condensation" @default.
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- W3102565597 doi "https://doi.org/10.1007/s10909-011-0412-7" @default.
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