Two-band superfluidity from the BCS to the BEC limit
arXiv:cond-mat/0603601 · doi:10.1103/PhysRevB.74.144517
Abstract
We analyze the evolution of two-band superfluidity from the weak coupling Bardeen-Cooper-Schrieffer (BCS) to the strong coupling Bose-Einstein condensation (BEC) limit. When the interband interaction is tuned from negative to positive values, a quantum phase transition occurs from a 0-phase to a -phase state, depending on the relative phase of two order parameters. Furthermore, population imbalances between the two bands can be created by tuning the intraband or interband interactions. We also find two undamped low energy collective excitations corresponding to in-phase and out-of-phase modes. Lastly, we derive the coupled Ginzburg-Landau equations, and show that they reduce to coupled Gross-Pitaevskii equations for two types of bosons in the BEC limit.
4 pages and 3 figures
References in corpus (19)
- Observation of resonance condensation of fermionic atom pairs
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Pairing and Phase Separation in a Polarized Fermi Gas
- Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State
- Experimental Study of the BEC-BCS Crossover Region in Lithium 6
- Evidence for Superfluidity in a Resonantly Interacting Fermi Gas
- Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
- Fermionic atoms in a 3D optical lattice: Observing Fermi-surfaces, dynamics and interactions
- Collective excitations of a degenerate gas at the BEC-BCS crossover
- Conversion of an Atomic Fermi Gas to a Long-Lived Molecular Bose Gas
- Molecular Probe of Pairing in the BEC-BCS Crossover
- Two-Band Superconductivity in MgB2
- BCS-BEC crossover at finite temperature for superfluid trapped Fermi atoms
- Specific heat of single crystal MgB_2: a two-band superconductor with two different anisotropies
- Definitive experimental evidence for two-band superconductivity in MgB2
- Two-species fermion mixtures with population imbalance
- Electrostatic Tuning of the Superconductor-Insulator Transition in Two Dimensions
- Superfluid transition temperature in a trapped gas of Fermi atoms with a Feshbach resonance
- BCS-BEC crossover of collective excitations in two-band superfluids
Cited by in corpus (32)
- Superconductivity vs bound state formation in a two-band superconductor with small Fermi energy -- applications to Fe-pnictides/chalcogenides and doped SrTiO3
- Band-edge BCS-BEC crossover in a two-band superconductor: physical properties and detection parameters
- A dual-species Bose-Einstein condensate with attractive interspecies interactions
- Screening of pair fluctuations in superconductors with coupled shallow and deep bands: a route to higher temperature superconductivity
- Collective modes in multiband superfluids and superconductors: Multiple dynamical classes
- Orbital Feshbach Resonance: A "Wide" Narrow Resonance for Higher Transition Temperature Fermi Superfluid
- Enhanced critical temperature, pairing fluctuation effects, and BCS-BEC crossover in a two-band Fermi gas
- Finite temperature effective field theory and two-band superfluidity in Fermi gases
- Magnetic Lifshitz transition and its consequences in multi-band iron-based superconductors
- General two-order-parameter Ginzburg-Landau model with quadratic and quartic interactions
- Geometric methods for the most general Ginzburg-Landau model with two order parameters
- Two-band superfluidity and intrinsic Josephson effect in alkaline-earth Fermi gases across an orbital Feshbach resonance
- Coexistence of giant Cooper pairs with a bosonic condensate and anomalous behavior of energy gaps in the BCS-BEC crossover of a two-band superfluid Fermi gas
- Stable Sarma State in Two-band Fermi Systems
- Dipole dynamics of an interacting bosonic mixture
- BCS-BEC Crossover and Pairing Fluctuations in a Two Band Superfluid/Superconductor: A T Matrix Approach
- Resonant pair-exchange scattering and BCS-BEC crossover in a system composed of dispersive and heavy incipient bands: a Feshbach analogy
- Mechanism of screening or enhancing the pseudogap throughout the two-band Bardeen-Cooper-Schrieffer to Bose-Einstein condensate crossover
- High magnetic field superconductivity in a two-band superconductor
- Two-band description of resonant superfluidity in atomic Fermi gases
- Constrained weak-coupling superconductivity in multiband superconductors
- Theory of macroscopic quantum tunneling with Josephson-Leggett collective excitations in multi-band superconducting Josephson junctions
- Leggett collective excitations in a two-band Fermi superfluid at finite temperatures
- Generalized Crossover in Interacting Fermions within the Low-Energy Expansion
- Diversified vortex phase diagram for a rotating trapped two-band Fermi gas in the BCS-BEC crossover
- Emergent Fano-Feshbach resonance in two-band superconductors with an incipient quasi-flat band: Enhanced critical temperature evading particle-hole fluctuations
- Asymmetric Fermion Superfluid with Inter- and Intra-Species Pairings
- Dynamic properties of superconductors: Anderson-Bogoliubov mode and Berry phase in BCS and BEC regimes
- Bypassing the lattice BCS-BEC crossover in strongly correlated superconductors: resilient coherence from multiorbital physics
- BCS-BCS crossover between atomic and molecular superfluids in a Bose-Fermi mixture
- Hybrid-pair superfluidity in a strongly driven Fermi gas
- Hidden Pseudogap and Excitation Spectra in a Strongly Coupled Two-Band Superfluid/Superconductor