Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 17: Postersitzung II: Mesoskopische Systeme (1-19), Supraleiter: Theorie (20-26), Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter (27-33), Schwere Fermionen, Kondo-Systeme (34-45)

TT 17.45: Poster

Mittwoch, 13. März 2002, 14:30–18:00, A

Coexistence of s-wave superconductivity and antiferromagnetism. — •Martin Feldbacher und Fakher Assaad — Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart

We consider a half-filled attractive Hubbard supplemented by pair-hopping processes and a Heisenberg term. This model shows various phase transitions including a charge-density wave (CDW) to superfluid transition (SF) as well as superfluid to antiferromagnetic (SDW). We show the existence of a phase where, due to symmetry, all above mentioned phases (SDW+CDW+SF) coexist. In this model, phase boundaries are characterized by higher symmetry. Those results are obtained on the basis of zero temperature auxiliary field QMC simulations.