Modulated pair condensate of p-orbital ultracold fermions

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.033610· OSTI ID:21456957

Zixu, Zhang; Erhai, Zhao; Liu, W Vincent ^[1]; Hung, Hsiang-Hsuan ^[2]; Ho, Chiu Man ^[3]

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1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
2. Department of Physics, University of California, San Diego, California 92093 (United States)
3. Department of Physics, University of California, Berkeley, California 94720 (United States)

We show that an interesting kind of pairing occurs for spin-imbalanced Fermi gases under a specific experimental condition--the spin up and spin down Fermi levels lying within the p{sub x} and s orbital bands of an optical lattice, respectively. The pairs condense at a finite momentum equal to the sum of the two Fermi momenta of spin up and spin down fermions and form a p-orbital pair condensate. This 2k{sub F} momentum dependence has been seen before in spin- and charge-density waves, but it differs from the usual p-wave superfluids such as {sup 3}He, where the orbital symmetry refers to the relative motion within each pair. Our conclusion is based on the density matrix renormalization group analysis for the one-dimensional (1D) system and mean-field theory for the quasi-1D system. The phase diagram of the quasi-1D system is calculated, showing that the p-orbital pair condensate occurs in a wide range of fillings. In the strongly attractive limit, the system realizes an unconventional BEC beyond Feynman's no-node theorem. The possible experimental signatures of this phase in molecule projection experiment are discussed.

• OSTI ID: 21456957
• Journal Information: Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.033610; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHARGE DENSITY
DENSITY MATRIX
FERMI GAS
FERMI LEVEL
FERMIONS
HELIUM 3
MEAN-FIELD THEORY
MOLECULES
ONE-DIMENSIONAL CALCULATIONS
P WAVES
PHASE DIAGRAMS
RENORMALIZATION
SPIN
SUPERFLUIDITY
ANGULAR MOMENTUM
DIAGRAMS
ENERGY LEVELS
EVEN-ODD NUCLEI
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATRICES
NUCLEI
PARTIAL WAVES
PARTICLE PROPERTIES
STABLE ISOTOPES