The impact of speckle disorder on a superfluid Fermi system
arXiv:1810.03582 · doi:10.1103/PhysRevB.100.045149
Abstract
Optical lattice experiments which probe the effect of disorder on superfluidity often use a speckle pattern for generating the disorder. Such speckle disorder is spatially correlated. While fermionic superfluidity in the presence of uncorrelated disorder is well studied, the impact of correlated disorder, particularly on thermal properties of the superfluid, is poorly understood. We provide a detailed study of the impact of speckle disorder, for varying speckle size and disorder magnitude, on the ground state and thermal properties of a Fermi superfluid. We work in the strong coupling regime of BCS-BEC crossover in a two dimensional lattice. For a fixed disorder strength, an increase in speckle size leads to smoothening of the self-consistent background potential, increase in the critical disorder needed for a superfluid-insulator transition, and an increase in superfluid . Along with these hints at decrease in effective disorder, speckle correlations also suppress the superfluid gap and the gap formation temperature - effects normally associated with increasing disorder. We correlate these effects with the effective potential and the single particle localisation effects in the ground state
arXiv comment12 pages, 15 figures. going to appear in Phys Rev B
References in corpus (47)
- Cold bosonic atoms in optical lattices
- Anderson localization of a non-interacting Bose-Einstein condensate
- Observation of resonance condensation of fermionic atom pairs
- Direct observation of Anderson localization of matter-waves in a controlled disorder
- Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Fermi-Hubbard physics with atoms in an optical lattice
- Three-dimensional localization of ultracold atoms in an optical disordered potential
- Three-Dimensional Anderson Localization of Ultracold Matter
- Nature of the superconductor-insulator transition in disordered superconductors
- Inhomogeneous Pairing in Highly Disordered s-wave Superconductors
- Anderson Localization of Expanding Bose-Einstein Condensates in Random Potentials
- Disorder-induced Localization in a Strongly Correlated Atomic Hubbard Gas
- Strongly interacting bosons in a disordered optical lattice
- Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
- Single and two-particle energy gaps across the disorder-driven superconductor-insulator transition
- Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
- Disordered insulator in an optical lattice
- Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
- Coherent Matter Wave Transport in Speckle Potentials
- Superconductor-Insulator Transition in a Disordered Electronic System
- Localization of Matter Waves in 2D-Disordered Optical Potentials
- Mobility edge for cold atoms in laser speckle potentials
- Phase Fluctuations in Strongly Coupled -Wave Superconductors
- Anderson localization of ultracold atoms: Where is the mobility edge?
- Critical Temperature and Condensate Fraction of a Fermion Pair Condensate
- Quantum transport of atomic matterwaves in anisotropic 2D and 3D disorder
- Three-Dimensional Anderson Localization in Variable Scale Disorder
- Stochastic Mean-Field Theory: Method and Application to the Disordered Bose-Hubbard Model at Finite Temperature and Speckle Disorder
- Anomalous proximity effect in an inhomogeneous disordered superconductor
- Matter Wave Transport and Anderson Localization in Anisotropic 3D Disorder
- Superfluid transition in a Bose gas with correlated disorder
- Direct Observation of Fragmentation in a Disordered, Strongly Interacting Fermi Gas
- Systematic investigation of the effects of disorder at the lowest order throughout the BCS-BEC crossover
- Anderson localization in optical lattices with correlated disorder
- Understanding the superfluid phase diagram in trapped Fermi gases
- Simulation of Anderson localization in two-dimensional ultracold gases for point-like disorder
- Anomalous suppression of the Bose glass at commensurate fillings in the disordered Bose-Hubbard model
- Charge Dynamics Across the Disorder Driven Superconductor-Insulator Transition
- Localization of correlated fermions in optical lattices with speckle disorder
- How to measure the spatial correlations in disordered Berezinski-Kosterlitz-Thouless transition ?
- A real space auxiliary field approach to the BCS-BEC crossover
- An energy-resolved atomic scanning probe
- The effect of amplitude fluctuations on the BKT transition
- Ferromagnetism in a Repulsive Atomic Fermi Gas with Correlated Disorder
- Transport of Hubbard-Band Quasiparticles in Disordered Optical Lattices
- Anderson localization in optical lattices with speckle disorder