Confinement-Induced Enhancement of Superconductivity in a Spin- Fermion Chain Coupled to a Lattice Gauge Field
arXiv:2208.07099 · doi:10.1103/PhysRevB.107.125141
Abstract
We investigate a spin- fermion chain minimally coupled to a gauge field. In the sector of the gauge generator , the model reduces to the Hubbard model with repulsive onsite interaction coupled to a gauge field. We uncover how electric fields affect low-energy excitations by both analytical and numerical methods. In the half-filling case, despite electric fields, the system is still a Mott insulator, just like the Hubbard model. For hole-doped systems, holes are confined under nonzero electric fields, resulting in a hole-pair bound state. Furthermore, this bound state also significantly affects the superconductivity, which manifests itself in the emergence of attractive interactions between bond singlet Cooper pairs. Specifically, numerical results reveal that the dimension of the dominant superconducting order parameter becomes smaller when increasing the electric field, signaling an enhancement of the superconducting instability induced by lattice fermion confinement. The superconducting order can even be the dominant order of the system for suitable doping and large applied electric field. The confinement also induces a momentum for the dominant superconducting order parameter leading to a quasi-long-range pair density wave order. Our results provide insights for understanding unconventional superconductivity in LGTs and might be experimentally addressed in quantum simulators.
arXiv comment14 pages, 7+2 figures
References in corpus (68)
- Many-Body Physics with Ultracold Gases
- Fault-tolerant quantum computation by anyons
- The density-matrix renormalization group in the age of matrix product states
- The density-matrix renormalization group
- Correlated Electrons in High Temperature Superconductors
- Quantum Simulation
- Quantum information with Rydberg atoms
- Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
- Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
- Quantum Spin Liquid States
- "Deconfined" quantum critical points
- Atomic physics and quantum optics using superconducting circuits
- Microwave photonics with superconducting quantum circuits
- Many-Body Physics with Individually-Controlled Rydberg Atoms
- Theory of Intertwined Orders in High Temperature Superconductors
- Natural and artificial atoms for quantum computation
- Z_2 Gauge Theory of Electron Fractionalization in Strongly Correlated Systems
- Schrieffer-Wolff transformation for quantum many-body systems
- Simulating Lattice Gauge Theories within Quantum Technologies
- Floquet approach to lattice gauge theories with ultracold atoms in optical lattices
- Atomic Quantum Simulation of Dynamical Gauge Fields coupled to Fermionic Matter: From String Breaking to Evolution after a Quench
- Short-ranged RVB physics, quantum dimer models and Ising gauge theories
- Striped superconductors: How the cuprates intertwine spin, charge and superconducting orders
- Observation of gauge invariance in a 71-site Bose-Hubbard quantum simulator
- Realization of density-dependent Peierls phases to engineer quantized gauge fields coupled to ultracold matter
- Lattice gauge theories and string dynamics in Rydberg atom quantum simulators
- Lattice gauge theories simulations in the quantum information era
- Simulating Compact Quantum Electrodynamics with ultracold atoms: Probing confinement and nonperturbative effects
- Disorder-Free Localization
- Simulating lattice gauge theories on a quantum computer
- Resolution of Gauge Ambiguities in Ultrastrong-Coupling Cavity QED
- Thermalization dynamics of a gauge theory on a quantum simulator
- Theory of the striped superconductor
- Quantum simulation of a lattice Schwinger model in a chain of trapped ions
- Superconducting Circuits for Quantum Simulation of Dynamical Gauge Fields
- Towards simulating 2D effects in lattice gauge theories on a quantum computer
- Towards analog quantum simulations of lattice gauge theories with trapped ions
- Digital quantum simulation of lattice gauge theories with dynamical fermionic matter
- Emerging 2D Gauge theories in Rydberg configurable arrays
- Absence of Ergodicity without Quenched Disorder: from Quantum Disentangled Liquids to Many-Body Localization
- Charged fermions coupled to gauge fields: Superfluidity, confinement and emergent Dirac fermions
- Bipolarons in the Extended Holstein Hubbard Model
- Pair Density Wave correlations in the Kondo-Heisenberg Model
- Quantum Critical Points and the Sign Problem
- Confined phases of one-dimensional spinless fermions coupled to gauge theory
- Ising ferromagnet to valence bond solid transition in a one-dimensional spin chain: Analogies to deconfined quantum critical points
- Dynamical Localization in Lattice Gauge Theories
- Finite-density phase diagram of a (1+1)-d non-abelian lattice gauge theory with tensor networks
- A simple fermionic model of deconfined phases and phase transitions
- Pair-Density-Wave Superconducting Order in Two-Leg Ladders
- Simple lattice gauge theories at finite fermion density
- Gauge invariance of the Dicke and Hopfield models
- Matrix Model simulations using Quantum Computing, Deep Learning, and Lattice Monte Carlo
- Strong Coupling Limit of the Holstein-Hubbard Model
- Gauge freedom, quantum measurements, and time-dependent interactions in cavity and circuit QED
- Gauging the Kitaev chain
- Gauge Principle and Gauge Invariance in Two-Level Systems
- Gauge Principle and Gauge Invariance in Quantum Two-Level Systems
- Confinement and Mott transitions of dynamical charges in 1D lattice gauge theories
- Enhancing disorder-free localization through dynamically emergent local symmetries
- Robust topological order in fermionic gauge theories: from Aharonov-Bohm instability to soliton-induced deconfinement
- Loops and Strings in a Superconducting Lattice Gauge Simulator
- Quantum phases of two-dimensional gauge theory coupled to single-component fermion matter
- Superconducting gap for a 2-leg t-J ladder
- Rotational Resonances and Regge Trajectories in Lightly Doped Antiferromagnets
- Thermal conductance as a probe of the non-local order parameter for a topological superconductor with gauge fluctuations
- lattice gauge theory in a ladder geometry
- Quantum Simulation of Lattice Gauge Theories on Superconducting Circuits: Quantum Phase Transition and Quench Dynamics