Unconventional pairing in few-fermion systems at finite temperature
arXiv:2202.07639 · doi:10.1038/s41598-022-22411-w
Abstract
Attractively interacting two-component mixtures of fermionic particles confined in a one-dimensional harmonic trap are investigated. Properties of balanced and imbalanced systems are systematically explored with the exact diagonalization approach, focusing on the finite-temperature effects. Using single- and two-particle density distributions, specific non-classical pairing correlations are analyzed in terms of the noise correlations -- quantity directly accessible in state-of-the-art experiments with ultra-cold atoms. It is shown that along with increasing temperature, any imbalanced system hosting Fulde-Ferrel-Larkin-Ovchinnikov pairs crossovers to a standard Bardeen-Cooper-Schrieffer one characterized by zero net momentum of resulting pairs. By performing calculations for systems with different imbalances, the approximate boundary between the two phases on a phase diagram is determined.
arXiv commentAll data generated or analysed during this study are available in Zenodo repository DOI:10.5281/zenodo.8220783 see https://zenodo.org/record/8220784
References in corpus (63)
- Feshbach Resonances in Ultracold Gases
- Atomic Scattering in Presence of an External Confinement and a Gas of Impenetrable Bosons
- Inhomogeneous Superconductivity in Condensed Matter and QCD
- Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5
- Probing many-body states of ultra-cold atoms via noise correlations
- Spatial quantum noise interferometry in expanding ultracold atom clouds
- Spin-Imbalance in a One-Dimensional Fermi Gas
- Deterministic Preparation of a Tunable Few-Fermion System
- Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
- Observation of Spatial Charge and Spin Correlations in the 2D Fermi-Hubbard Model
- From Few to Many: Observing the Formation of a Fermi Sea One Atom at a Time
- Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductor κ_2_2$
- Attractive Fermi gases with unequal spin populations in highly elongated traps
- First order superconducting phase transition in CeCoIn
- Finite temperature phase diagram of a polarised Fermi condensate
- Few-body physics with ultracold atomic and molecular systems in traps
- Parity Effect in Ground State Energies of Ultrasmall Superconducting Grains
- Superfluidity in nuclear systems and neutron stars
- Pairing in few-fermion systems with attractive interactions
- Pairing states of a polarized Fermi gas trapped in a one-dimensional optical lattice
- Evidence of Andreev bound states as a hallmark of the FFLO phase in -(BEDT-TTF)Cu(NCS)
- Inhomogeneous superconducting state in quasi-one-dimensional systems
- Counting atoms using interaction blockade in an optical superlattice
- One-dimensional mixtures of several ultracold atoms: a review
- The Fulde-Ferrell-Larkin-Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review
- Spin-resolved single-atom imaging of Li in free space
- Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in one-dimensional optical lattices
- Exact quantum Monte Carlo study of one dimensional trapped fermions with attractive contact interactions
- Generic Phase Diagram of Fermion Superfluids with Population Imbalance
- Exact Numerical Study of Pair Formation with Imbalanced Fermion Populations
- The FFLO state in the one-dimensional attractive Hubbard model and its fingerprint in the spatial noise correlations
- Experimental Characterization of Two-Particle Entanglement through Position and Momentum Correlations
- Few interacting fermions in one-dimensional harmonic trap
- Color Superconductivity in Compact Stars
- Observation of Cooper Pairs in a Mesoscopic 2D Fermi Gas
- Exact Diagonalization of the Hamiltonian for Trapped Interacting Bosons
- Spectral signatures of the Fulde-Ferrell-Larkin-Ovchinnikov order parameter in one-dimensional optical lattices
- Pairing in a system of a few attractive fermions in a harmonic trap
- Tan's Contact for Trapped Lieb-Liniger Bosons at Finite Temperature
- Noise Correlations in low-dimensional systems of ultracold atoms
- Noise Correlations in one-dimensional systems of ultra-cold fermions
- Pairing of few Fermi atoms in one dimension
- Few-fermion thermometry
- A low energy theory for superfluid and solid matter and its application to the neutron star crust
- Finite temperature QMC study of the one-dimensional polarized Fermi gas
- Spin-polarized droplets in the unitary Fermi gas
- Pi-phases in balanced fermionic superfluids on spin-dependent optical lattices
- Signatures of unconventional pairing in spin-imbalanced one-dimensional few-fermion systems
- Static and dynamic properties of a few spin interacting fermions trapped in an harmonic potential
- Efficient construction of many-body Fock states having the lowest energies
- Critical behaviour in one dimension: unconventional pairing, phase separation, BEC-BCS crossover and magnetic Lifshitz transition
- Pairing patterns in one-dimensional spin- and mass-imbalanced Fermi gases
- Unconventional pairing in one-dimensional systems of a few mass-imbalanced ultracold fermions
- A modular implementation of an effective interaction approach for harmonically trapped fermions in 1D
- Two-point momentum correlations of few ultracold quasi-one-dimensional trapped fermions: Diffraction patterns
- Dynamics of spin-polarized impurity in ultracold Fermi gas
- Quantum Lifshitz points and fluctuation-induced first-order phase transitions in imbalanced Fermi mixtures
- Intercomponent correlations in attractive one-dimensional mass-imbalanced few-body mixtures
- Parity effect in a mesoscopic Fermi gas
- Simulating artificial one-dimensional physics with ultra-cold fermionic atoms: three exemplary themes
- Finite temperature contact for SU(2) fermions trapped in a 1D harmonic confinement
- Phase transitions in quasi-one dimensional system with unconventional superconductivity
- Few-body perspective on fermionic pairing in one spatial dimension