Spin-Depairing-Induced Exceptional Fermionic Superfluidity
arXiv:2504.19525 · doi:10.1103/ntjf-zb2v
Abstract
We investigate the non-Hermitian (NH) attractive Hubbard model with spin depairing, which is a spin-resolved asymmetric hopping that nonreciprocally operates spins in the opposite direction. We find that spin depairing stabilizes a superfluid state unique to the NH system. This phase is characterized not only by a finite order parameter, but also by the emergence of exceptional points (EPs) in the momentum space - a feature that starkly contrasts with previously discussed NH fermionic superfluidity, where EPs are absent within the superfluid state and emerge only at the onset of the superfluid breakdown. We uncover the rich mechanism underlying this ``exceptional fermionic superfluidity'' by analyzing the interplay between EPs and the effective density of states of the complex energy dispersion. Furthermore, we reveal that the exceptional superfluid state breaks down induced by strong spin depairing on the cubic lattice, while it remains robust on the square lattice.
13 pages, 8 figures
References in corpus (104)
- Edge states and topological invariants of non-Hermitian systems
- Non-Hermitian Physics
- Topological phases of non-Hermitian systems
- Symmetry and Topology in Non-Hermitian Physics
- Realizing a lattice spin model with polar molecules
- Quantum trajectories and open many-body quantum systems
- Non-Hermitian Boundary Modes
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Non-Hermitian skin effect and chiral damping in open quantum systems
- Non-reciprocal phase transitions
- Keldysh Field Theory for Driven Open Quantum Systems
- Second-Order Topological Phases in Non-Hermitian Systems
- Strong dissipation inhibits losses and induces correlations in cold molecular gases
- Quantum exceptional points of non-Hermitian Hamiltonians and Liouvillians: The effects of quantum jumps
- Interior Gap Superfluidity
- BEC-BCS crossover in "magnetized" Feshbach-resonantly paired superfluids
- Controlling the dynamics of an open many-body quantum system with localized dissipation
- Non-Hermitian Many-Body Localization
- Parity-time-symmetric quantum critical phenomena
- Synthetic dimensions and spin-orbit coupling with an optical clock transition
- Signatures of Many-Body Localization in a Controlled Open Quantum System
- Non-Hermitian perspective of the band structure in heavy-fermion systems
- Topological unification of time-reversal and particle-hole symmetries in non-Hermitian physics
- Exceptional rings in two-dimensional correlated systems with chiral symmetry
- Observation of the Mott Insulator to Superfluid Crossover of a Driven-Dissipative Bose-Hubbard System
- Symmetry-protected nodal phases in non-Hermitian systems
- Theory of Non-Hermitian Fermionic Superfluidity with a Complex-Valued Interaction
- Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries
- Non-equilibrium steady-states in a driven-dissipative superfluid
- BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
- Liouvillian Skin Effect: Slowing Down of Relaxation Processes without Gap Closing
- Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
- Exceptional Surfaces in PT-Symmetric Photonic Systems
- Non-Hermitian Kondo effect in ultracold alkaline-earth atoms
- Suppressing the loss of ultracold molecules via the continuous quantum Zeno effect
- Quantum Control by Imaging : The Zeno effect in an ultracold lattice gas
- Exact Liouvillian Spectrum of a One-Dimensional Dissipative Hubbard Model
- Continuous Phase Transition without Gap Closing in Non-Hermitian Quantum Many-Body Systems
- Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
- Skin superfluid, topological Mott insulators, and asymmetric dynamics in interacting non-Hermitian Aubry-Andre-Harper models
- Anomalous momentum diffusion in a dissipative many-body system
- Many-body topology of non-Hermitian systems
- Quantum critical behavior influenced by measurement backaction in ultracold gases
- Dynamics of Ultracold Quantum Gases in the Dissipative Fermi-Hubbard Model
- Non-Hermitian topological Mott insulators in one-dimensional fermionic superlattices
- Many-body approach to non-Hermitian physics in fermionic systems
- Symmetry breaking and spectral structure of the interacting Hatano-Nelson model
- Non-Hermitian phase transition from a polariton Bose-Einstein condensate to a photon laser
- DMFT reveals the non-Hermitian topology in heavy-fermion systems
- Two-dimensional non-Hermitian skin effect in an ultracold Fermi gas
- Observation of a non-Hermitian phase transition in an optical quantum gas
- Universal properties of dissipative Tomonaga-Luttinger liquids: Case study of a non-Hermitian XXZ spin chain
- Non-Hermitian Many-Body Localization with Open Boundaries
- Dissipative Bose-Hubbard system with intrinsic two-body loss
- Critical fluctuations at a many-body exceptional point
- Kondo effect in a parity-time-symmetric non-Hermitian Hamiltonian
- Dynamical sign reversal of magnetic correlations in dissipative Hubbard models
- Liouvillian Skin Effect in an Exactly Solvable Model
- Collective Excitations and Nonequilibrium Phase Transition in Dissipative Fermionic Superfluids
- Theory of superconductivity with non-Hermitian and parity-time reversal symmetric cooper pairing symmetry
- Quantized conductance through a dissipative atomic point contact
- Exceptional Spin Liquids from Couplings to the Environment
- Topological Bose-Mott insulators in one-dimensional non-Hermitian superlattices
- Preparation and spectroscopy of a metastable Mott insulator state with attractive interactions
- Interaction-induced non-Hermitian topological phases from a dynamical gauge field
- Non-Hermitian Mott Skin Effect
- Unusual wave-packet spreading and entanglement dynamics in non-Hermitian disordered many-body systems
- Localization properties in disordered quantum many-body dynamics under continuous measurement
- Quantum Criticality in Open Quantum Spin Chains with Nonreciprocity
- Non-Hermitian strongly interacting Dirac fermions: a quantum Monte-Carlo study
- Observation of the Sign Reversal of the Magnetic Correlation in a Driven-Dissipative Fermi Gas in Double Wells
- Non-Hermitian Stark Many-Body Localization
- Superfluid signatures in a dissipative quantum point contact
- Universal description of dissipative Tomonaga-Luttinger liquids with SU() spin symmetry: Exact spectrum and critical exponents
- Anomalously large relaxation times in dissipative lattice models beyond the non-Hermitian skin effect
- Interaction-induced Liouvillian skin effect in a fermionic chain with a two-body loss
- Universal Critical Behaviors in Non-Hermitian Phase Transitions
- -pairing ground states in the non-Hermitian Hubbard model
- Geometry and superfluidity of the flat band in a non-Hermitian optical lattice
- Non-Hermitian BCS-BEC evolution with a complex scattering length
- Rectification in Nonequilibrium Steady States of Open Many-Body Systems
- Yang-Lee Zeros, Semicircle Theorem, and Nonunitary Criticality in Bardeen-Cooper-Schrieffer Superconductivity
- Topological Protection in non-Hermitian Haldane Honeycomb Lattices
- Complex fixed points of the non-Hermitian Kondo model in a Luttinger liquid
- Statics and Dynamics of non-Hermitian Many-Body Localization
- Exceptional points near first- and second-order quantum phase transitions
- Interplay between coherent and dissipative dynamics of bosonic doublons in an optical lattice
- Steady-state edge burst: From free-particle systems to interaction-induced phenomena
- Symmetry protected exceptional points of interacting fermions
- Non-Hermitian Hubbard model without the sign problem
- Magnetic field-induced gapless state in multiband superconductors
- Resonant generation of -wave Cooper pair in non-Hermitian Kitaev chain at exceptional point
- Theory of non-Hermitian fermionic superfluidity on a honeycomb lattice: Interplay between exceptional manifolds and van Hove Singularity
- Non-Hermitian topological Fermi superfluid near the -wave unitary limit
- Non-Hermitian BCS-BEC crossover of Dirac fermions
- Non-Hermitian Haldane-Hubbard model: Effective description of one- and two-body dissipation
- Correlation versus dissipation in a non-Hermitian Anderson impurity model
- Phase diagram of non-Hermitian BCS superfluids in a dissipative asymmetric Hubbard model
- Spin-Depairing Transition of Attractive Fermi Gases on a Ring Driven by Synthetic Gauge Fields
- Non-Hermitian Ferromagnetism in an Ultracold Fermi Gas
- Work statistics and generalized Loschmidt echo for the Hatano-Nelson model
- Saturation of thermal and spin conductances in a dissipative superfluid junction
- Slow approach to adiabaticity in many-body non-Hermitian systems: the Hatano-Nelson Model
- Non-Hermitian -wave superfluid and effects of the inelastic three-body loss in a one-dimensional spin-polarized Fermi gas