Quantum phase liquids: Fermionic superfluid without phase coherence
Department of Physics, Beijing Normal University - Beijing 100875, China
Received: 20 June 2014
Accepted: 12 August 2014
We investigate the two-dimensional generalized attractive Hubbard model in a bipartite lattice, and find a “quantum phase liquid” phase, in which the fermions are paired but do not have phase coherence at zero temperature, in analogy to quantum spin liquid phase. In addition, two types of topological quantum phase liquids with a small external magnetic field —Z2 quantum phase liquids and chiral quantum phase liquids— are discussed.
PACS: 74.40.-n – Fluctuation phenomena / 74.25.Dw – Superconductivity phase diagrams
© EPLA, 2014