A novel route to a finite center-of-mass momentum pairing state; current driven FFLO state

Abstract

The previously studied Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is stabilized by a magnetic field via the Zeeman coupling in spin-singlet superconductors. Here we suggest a novel route to achieve non-zero center-of-mass momentum pairing states in superconductors with Fermi surface nesting. We investigate two-dimensional superconductors under a uniform external current, which leads to a finite pair-momentum of ${\mathbf{q}}_e$. We find that an FFLO state with a spontaneous pair-momentum of ${\mathbf{q}}_s$ is stabilized above a certain critical current which depends on the direction of the external current. A finite ${\mathbf{q}}_s$ arises in order to make the total pair-momentum of ${\mathbf{q}}_t(={\mathbf{q}}_s+{\mathbf{q}}_e)$ perpendicular to the nesting vector, which lowers the free energy of the FFLO state, as compared to the superconducting and normal states. We also suggest experimental signatures of the FFLO state.

4 pages, 5 figures

References in corpus (1)

• Supercurrent in Nodal Superconductors

Cited by in corpus (11)

• Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in an Ising superconductor
• Broken translational and time-reversal symmetry in superconducting films
• Current-carrying states in FFLO superconductors
• Supercurrent-induced topological phase transitions
• Non-equilibrium strong-coupling theory for a driven-dissipative ultracold Fermi gas in the BCS-BEC crossover region
• Feasibility of a Fulde-Ferrell-Larkin-Ovchinnikov superfluid Fermi atomic gas
• Proposed Fermi-surface reservoir-engineering and application to realizing unconventional Fermi superfluids in a driven-dissipative non-equilibrium Fermi gas
• 1D-FFLO state in the absence of time-reversal symmetry breaking
• Engineering nonequilibrium superconducting phases in a voltage-driven superconductor under an external magnetic field
• Voltage controllable superconducting state in the multi-terminal superconductor-normal metal bridge
• Gap fluctuations, Cooper pairs with finite center-of-mass momentum, and suppression of superconductivity in inhomogeneous systems with dopant superpuddles agglomerates