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Physics Letters A

Renormalisation group approach to Bose-Einstein transition

K. K. Singh

Published Jan 1, 1975• 20 citations
Publisher
DOI
10.1016/0375-9601(75)90303-5

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Abstract The functional renormalisation group (FRG) approach is employed to study Bose polarons at finite temperatures in the regime of strong attractive bath-impurity interactions. Both two- and three-dimensional configurations are considered. The appearance of two polaron quasiparticle branches at finite temperatures is revealed, consistent with recent findings by other analytical techniques. Ground-state polaron energies are also reported for selected interactions and temperatures within the gas superfluid phase. The findings of this work present the FRG as a useful tool for studying finite-temperature polarons in quantum gases.