Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.34: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Coexistence of phase transitions and hysteresis near the onset of Bose-Einstein condensation — Michael Maennel4 and •Klaus Morawetz1,2,3 — 1Münster University of Applied Sciences,Stegerwaldstrasse 39, 48565 Steinfurt, Germany — 2International Institute of Physics- UFRN,Campus Universitário Lagoa nova,59078-970 Natal, Brazil — 3Max-Planck-Institute for the Physics of Complex Systems, 01187 Dresden, Germany — 4Informatik DV,Petersstr. 14,04109 Leipzig, Germany
Multiple phases occurring in a Bose gas with finite-range interaction are investigated [2]. In the vicinity of the onset
of Bose-Einstein condensation (BEC), the chemical potential and the pressure show a van der Waals-like behavior
indicating a first-order phase transition for weak interactions like Hartree-Fock or Popov
approximation. However, for
strong interactions there remains a multivalued region for the
T-matrix approximation even after the Maxwell
construction, which is interpreted as a density hysteresis [1]. This unified treatment of normal and condensed phases
becomes possible due to the recently found scheme to eliminate self-interactions in the T-matrix approximation,
which allows one to calculate properties below and above the critical temperature [3,4].
Phys. Rev. A 87 (2013) 053617
New J. Phys. 12 (2010) 033013
J. Stat. Phys. 143 (2011) 482
Phys. Rev. B 84 (2011) 094529