Quantum Phase Transitions across a p-Wave Feshbach Resonance

Journal Article · Fri Jun 17 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.230403· OSTI ID:20696366

Gurarie, V; Radzihovsky, L; Andreev, A V ^[1]

---

1. Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)

We study a single-species polarized Fermi gas tuned across a narrow p-wave Feshbach resonance. We show that in the course of a Bose-Einstein condensation (BEC)-BCS crossover, the system can undergo a magnetic-field-tuned quantum phase transition from a p{sub x}-wave to a p{sub x}+ip{sub y}-wave superfluid. The latter state, that spontaneously breaks time-reversal symmetry, furthermore undergoes a topological p{sub x}+ip{sub y} to p{sub x}+ip{sub y} transition at zero chemical potential {mu}. In two dimensions, for {mu}>0 it is characterized by a Pfaffian ground state exhibiting topological order and non-Abelian excitations familiar from fractional quantum Hall systems.

• OSTI ID: 20696366
• Journal Information: Physical Review Letters, Vol. 94, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.94.230403; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
EXCITATION
FERMI GAS
FERMI LEVEL
FERMIONS
GROUND STATES
MAGNETIC FIELDS
P WAVES
PHASE TRANSFORMATIONS
POTENTIALS
RESONANCE
SUPERFLUIDITY
SYMMETRY
SYMMETRY BREAKING
TOPOLOGY