Dispersive spectrum and orbital order of spinless p-band fermions in an optical lattice - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




Dispersive spectrum and orbital order of spinless p-band fermions in an optical lattice - Condensed Matter > Strongly Correlated Electrons - Download this document for free, or read online. Document in PDF available to download.

Abstract: We study single-particle properties of a spinless p-band correlated fermionicgas in an optical lattice by means of a variational cluster approach VCA. Thesingle-particle spectral function is almost flat at half-filling and develops astrongly dispersive behavior at lower fillings. The competition betweendifferent orbital orderings is studied as a function of filling. We observethat an ``antiferromagnetic- orbital order develops at half-filling and isdestroyed by doping the system evolving into a disordered orbital state. At lowfilling limit, we discuss the possibility of ``ferromagnetic- orbital order bycomplementing the VCA result with observations based on a trial wave function.We also study the behavior of the momentum distribution for different values ofthe on-site interaction. Finally, we introduce an integration contour in thecomplex plane which allows to efficiently carry out Matsubara-frequency sums.



Author: Xiancong Lu, E. Arrigoni

Source: https://arxiv.org/







Related documents