Regensburg 1998 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 10: Postersitzung I: Ladungseffekte in Einelektronensystemen (1-6), Niedrigdimensionale Systeme (7-17), Transporteigenschaften und Pinning in HTSL (18-30), Symmetrie des Ordnungsparameters in HTSL (31-36), Korrelierte Elektronen: Theorie (37-79)

TT 10.39: Poster

Dienstag, 24. März 1998, 09:30–13:00, A

Hole motion and superconductivity in a triangular antiferromagnet — •M. Vojta^1,2 and E. Dagotto¹ — ¹National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA — ²Institut f"ur Theoretische Physik, Technische Universit"at Dresden, D-01062 Dresden

The hole motion in a triangular antiferromagnet described by the t-J model is investigated. Based on the string picture we have calculated the one-hole spectral function at half-filling using projection technique. The spectrum shows a quasiparticle-like peak for all momenta in agreement with recent numerical studies. The one-hole dispersion has minima at the corners of the Brillouin zone. Using the obtained one-hole properties we discuss a simple model consisting of fermions moving on a triangular lattice with an additional attractive real-space interaction. The exact solution of the two-particle problem yields a bound state with f-wave correlations. Using standard BCS mean-field theory we have studied possible superconductivity at low hole densities for this system. For a wide parameter range we find superconductivity with an order parameter obeying f-wave symmetry.