Phase diagram and binding energy of interacting Bose gases

From the many-body T matrix, the condition for a medium-dependent bound state and its binding energy is derived for a homogeneous interacting Bose gas. This condition provides the critical line in the phase diagram in terms of the medium-dependent scattering length. Separating the Bose pole from the...

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Bibliographic Details
Published in:	Physical review. B, Condensed matter and materials physics Vol. 78; no. 5
Main Authors:	Männel, M., Morawetz, K., Schreiber, M., Lipavský, P.
Format:	Journal Article
Language:	English
Published:	United States 01-08-2008
Subjects:	BINDING ENERGY BOSE-EINSTEIN GAS BOSONS BOUND STATE CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY DISTRIBUTION FUNCTIONS MANY-BODY PROBLEM PHASE DIAGRAMS S MATRIX SCATTERING LENGTHS
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Summary:	From the many-body T matrix, the condition for a medium-dependent bound state and its binding energy is derived for a homogeneous interacting Bose gas. This condition provides the critical line in the phase diagram in terms of the medium-dependent scattering length. Separating the Bose pole from the distribution function, the influence of a Bose condensate is discussed and a thermal minimum of the critical scattering length is found.
ISSN:	1098-0121 1550-235X
DOI:	10.1103/PhysRevB.78.054508