Nonzero orbital angular momentum superfluidity in ultracold Fermi gases

Journal Article · Sat Jul 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.013608· OSTI ID:20852948

Iskin, M

We analyze the evolution of superfluidity for nonzero orbital angular momentum channels from the Bardeen-Cooper-Schrieffer (BCS) to the Bose-Einstein condensation (BEC) limit in three dimensions. First, we analyze the low-energy scattering properties of finite range interactions for all possible angular momentum channels. Second, we discuss ground-state (T=0) superfluid properties including the order parameter, chemical potential, quasiparticle excitation spectrum, momentum distribution, atomic compressibility, ground-state energy, and low-energy collective excitations. We show that a quantum phase transition occurs for nonzero angular momentum pairing, unlike the s-wave case where the BCS to BEC evolution is just a crossover. Third, we present a Gaussian fluctuation theory near the critical temperature (T=T{sub c}), and we analyze the number of bound, scattering, and unbound fermions as well as the chemical potential. Finally, we derive the time-dependent Ginzburg-Landau functional near T{sub c}, and compare the Ginzburg-Landau coherence length with the zero-temperature average Cooper pair size.

• OSTI ID: 20852948
• Journal Information: Physical Review. A, Vol. 74, Issue 1; Other Information: DOI: 10.1103/PhysRevA.74.013608; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
36 MATERIALS SCIENCE
BCS THEORY
BOSE-EINSTEIN CONDENSATION
COHERENCE LENGTH
COLLECTIVE EXCITATIONS
COMPARATIVE EVALUATIONS
COMPRESSIBILITY
COOPER PAIRS
CRITICAL TEMPERATURE
DISTRIBUTION
FERMI GAS
FERMIONS
FINITE-RANGE INTERACTIONS
FLUCTUATIONS
GINZBURG-LANDAU THEORY
GROUND STATES
ORBITAL ANGULAR MOMENTUM
ORDER PARAMETERS
PHASE TRANSFORMATIONS
POTENTIALS
S WAVES
SCATTERING
SUPERFLUIDITY
TIME DEPENDENCE