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Large-N Expansion for Condensation and Stability of Bose–Bose Mixtures at Finite Temperatures

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Abstract

The two-component mixture of Bose particles with short-range pairwise interaction at finite temperatures in three dimensions is considered. Particularly, we examine, by means of the large-N expansion technique, the stability of the mixed state below the Bose–Einstein transition point and the temperature dependence of the condensate density for a symmetric mixture of Bose gases. The presented analysis reveals the importance of finite-temperature excitations of the non-condensed particles in formation of the phase diagram of two-component Bose systems.

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Acknowledgements

Work of O. H. was partly supported by Project FF-83F (No. 0119U002203) from the Ministry of Education and Science of Ukraine.

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  1. Department for Theoretical Physics, Ivan Franko National University of Lviv, 12 Drahomanov Street, Lviv-5, 79005, Ukraine

    Orest Hryhorchak & Volodymyr Pastukhov

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  1. Orest Hryhorchak
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  2. Volodymyr Pastukhov
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Correspondence to Volodymyr Pastukhov.

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Hryhorchak, O., Pastukhov, V. Large-N Expansion for Condensation and Stability of Bose–Bose Mixtures at Finite Temperatures. J Low Temp Phys 202, 219–230 (2021). https://doi.org/10.1007/s10909-020-02542-y

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  • DOI: https://doi.org/10.1007/s10909-020-02542-y

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