Orbital Fulde-Ferrell pairing state in moiré Ising superconductors

Abstract

In this work, we study superconducting moiré homobilayer transition metal dichalcogenides where the Ising spin-orbit coupling (SOC) is much larger than the moiré bandwidth. We call such noncentrosymmetric superconductors, moiré Ising superconductors. Due to the large Ising SOC, the depairing effect caused by the Zeeman field is negligible and the in-plane upper critical field ($B_{c2}$) is determined by the orbital effects. This allows us to study the effect of large orbital fields. Interestingly, when the applied in-plane field is larger than the conventional orbital $B_{c2}$, a finite-momentum pairing phase would appear which we call the orbital Fulde-Ferrell (FF) state. In this state, the Cooper pairs acquire a net momentum of $2q_B$ where $2q_B=eBd$ is the momentum shift caused by the magnetic field $B$ and $d$ denotes the layer separation. This orbital field-driven FF state is different from the conventional FF state driven by Zeeman effects in Rashba superconductors. Remarkably, we predict that the FF pairing would result in a giant superconducting diode effect under electric gating when layer asymmetry is induced. An upturn of the $B_{c2}$ as the temperature is lowered, coupled with the giant superconducting diode effect, would allow the detection of the orbital FF state.

arXiv comment6 pages, 4 figures, plus Supplementary Material

References in corpus (44)

• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Evidence of Ising pairing in superconducting NbSe${}_2$ atomic layers
• Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
• Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
• Magic continuum in twisted bilayer WSe2
• Two Dimensional Ising Superconductivity in Gated MoS${}_2$
• Topological insulators in twisted transition metal dichalcogenide homobilayers
• Hubbard model physics in transition metal dichalcogenide moiré bands
• Abundance of correlated insulating states at fractional fillings of WSe${}_2$/WS${}_2$ moiré superlattices
• Superconductivity protected by spin-valley locking in ion-gated MoS2
• Quantum anomalous Hall effect from intertwined moiré bands
• Realization of the field-free Josephson Diode
• Tuning Ising superconductivity with layer and spin-orbit coupling in two-dimensional transition-metal dichalcogenides
• Flat bands in twisted bilayer transition metal dichalcogenides
• Intrinsic Superconducting Diode Effect
• Supercurrent diode effect and finite momentum superconductivity
• Correlated Insulating States at Fractional Fillings of the WS2/WSe2 Moiré Lattice
• A phenomenological theory of superconductor diodes
• Supercurrent diode effect and magnetochiral anisotropy in few-layer NbSe${}_2$
• Topological superconductivity in monolayer transition metal dichalcogenides
• Stripe phases in WSe2/WS2 moiré superlattices
• Theory of the supercurrent diode effect in Rashba superconductors with arbitrary disorder
• Ising Superconductivity and Quantum Phase Transition in Macro-Size Monolayer NbSe2
• Ising Superconductivity and Majorana Fermions in Transition Metal Dichalcogenides
• Moiré quantum chemistry: charge transfer in transition metal dichalcogenide superlattices
• A full superconducting dome of strong Ising protection in gated monolayer WS2
• An unusual continuous paramagnetic-limited superconducting phase transition in 2D NbSe${}_2$
• Magnetic Field Driven Nodal Topological Superconductivity in Monolayer Transition Metal Dichalcogenides
• Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in an Ising superconductor
• Unconventional superconductivity in bilayer transition metal dichalcogenides
• Ising superconductivity and magnetism in NbSe${}_2$
• Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides
• Enhancement of the upper critical field in disordered transition metal dichalcogenide monolayers
• Odd-parity superconductivity in bilayer transition metal dichalcogenides
• Spin-orbit-parity coupled superconductivity in topological monolayer WTe${}_2$
• Yu-Shiba-Rusinov states and topological superconductivity in Ising paired superconductors
• Competition of Density Waves and Superconductivity in Twisted Tungsten Diselenide
• Spin-valley locked instabilities in moire transition metal dichalcogenides with conventional and higher-order Van Hove singularities
• Tunable Stripe Order and Weak Superconductivity in the Moiré Hubbard Model
• Superconductivity in the twisted bilayer transition metal dichalcogenide WSe${}_2$ : a quantum cluster study
• Topological Yu-Shiba-Rusinov chain in monolayer transition-metal dichalcogenide superconductors
• Strongly enlarged topological regime and enhanced superconducting gap in nanowires coupled to Ising superconductors

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• Theory of Correlated Insulators and Superconductor at $\nu =1$ in Twisted WSe${}_2$
• Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$
• Orbital effect on intrinsic superconducting diode effect
• Pseudo-Ising superconductivity induced by $p$-wave magnetism
• Geometric and conventional contributions of superconducting diode effect: Application to flat-band systems
• Reentrant topological phases and spin density wave induced by 1D moiré potentials
• Reentrant topological phases and entanglement scalings in moiré-modulated extended Su-Schrieffer-Heeger Model
• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• Tuning monolayer superconductivity in twisted NbSe${}_2$ graphene heterostructures
• Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in 2H-NbS2 flakes
• In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe${}_2$ homobilayers
• Charge Density Waves in the 2.5-Dimensional Quantum Heterostructure
• Onset of spin-valley order and Stoner boundaries in twisted WSe${}_2$
• Algebraic Criterion and Graph-Theoretic Construction of Intrinsic Superconducting Diode Effects
• Decomposing Electronic Structures in Twisted Multilayers: Bridging Spectra and Incommensurate Wave Functions
• Three-dimensional flat bands and possible interlayer triplet pairing superconductivity in the alternating twisted NbSe${}_2$ moiré bulk