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arXiv · 1408.3119

p-wave Superfluidity by Spin-Nematic Fermi Surface Deformation

Jan Gukelberger·Evgeny Kozik·Lode Pollet·Nikolay Prokof'ev·Manfred Sigrist·Boris Svistunov·Matthias Troyer
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Abstract

We study attractively interacting fermions on a square lattice with dispersion relations exhibiting strong spin-dependent anisotropy. The resulting Fermi surface mismatch suppresses the s-wave BCS-type instability, clearing the way for unconventional types of order. Unbiased sampling of the Feynman diagrammatic series using Diagrammatic Monte Carlo methods reveals a rich phase diagram in the regime of intermediate coupling strength. Instead of a proposed Cooper-pair Bose metal phase [A. E. Feiguin and M. P. A. Fisher, Phys. Rev. Lett. 103, 025303 (2009)] we find an incommensurate density wave at strong anisotropy and two different p-wave superfluid states with unconventional symmetry at intermediate anisotropy.

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Jan Gukelberger, Evgeny Kozik, Lode Pollet, Nikolay Prokof'ev, Manfred Sigrist, Boris Svistunov, Matthias Troyer. 2015-01-21. p-wave Superfluidity by Spin-Nematic Fermi Surface Deformation. https://doi.org/10.1103/physrevlett.113.195301

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