Discovery of a pair density wave state in a monolayer high-Tc iron-based superconductor

Abstract

The pair density wave (PDW) is an extraordinary superconducting state where Cooper pairs carry nonzero momentum. It can emerge when the full condensation of zero momentum Cooper pairs is frustrated. Evidence for the existence of intrinsic PDW order in high-temperature (high-Tc) cuprate superconductors and kagome superconductors has emerged recently. However, the PDW order in iron-based high-Tc superconductors has not been observed experimentally. Here, using scanning tunneling microscopy/spectroscopy, we report the discovery of the PDW state in monolayer iron-based high-Tc Fe(Te,Se) films grown on SrTiO3(001) substrates. The PDW state with a period of λ~3.6a_Fe (a_Fe is the distance between neighboring Fe atoms) is observed at the domain walls by the spatial electronic modulations of the local density of states, superconducting gap, and the π-phase shift boundaries of the PDW around the dislocations of the intertwined charge density wave order. The discovery of the PDW state in the monolayer Fe(Te,Se) film provides a low-dimensional platform to study the interplay between the correlated electronic states and unconventional Cooper pairing in high-Tc superconductors.

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• Theory of Intertwined Orders in High Temperature Superconductors
• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• Dynamical layer decoupling in a stripe-ordered, high T_c superconductor
• Ironing out the details of unconventional superconductivity
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• Dislocations and vortices in pair density wave superconductors
• Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates
• Appearance of fluctuating stripes at the onset of the pseudogap in the high-Tc Superconductor Bi2Sr2CaCu2O8+x
• Visualizing the Energy-gap Modulations of the Cuprate Pair Density Wave State
• Pair Density Wave correlations in the Kondo-Heisenberg Model
• Thermodynamic evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state in the KFe2As2 superconductor
• Visualizing the periodic modulation of Cooper pairing in a severely underdoped cuprate
• Nanoscale decoupling of electronic nematicity and structural anisotropy in FeSe thin films
• Kramers Fulde-Ferrell state and superconducting spin diode effect

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• Self-consistent theory of $2\times 2$ pair density waves in kagome superconductors
• Inhomogeneous high temperature melting and decoupling of charge density waves in spin-triplet superconductor UTe2
• Theory of charge-6e condensed phase in Kagome lattice superconductors
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• Signature of Orbital Driven Finite Momentum Pairing in a 3D Ising Superconductor
• Pair-density-wave superconductivity: a microscopic model on 2D honeycomb lattice
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• Synchronization in rotating supersolids
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• Melting of unidirectional charge density waves across twin domain boundaries in GdTe${}_3$
• Density matrix renormalization group study of quantum-geometry-facilitated pair density wave order
• Imaging half-unit-cell Cooper-pair density waves in monolayer 1T${}^{\prime }$-MoTe${}_2$
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Optically active Higgs and Leggett modes in multiband pair-density-wave superconductors with Lifshitz invariant
• Microscopic theory of pair density waves in spin-orbit coupled Kondo lattice
• Discovery of smectic charge and pair-density-wave orders in topological monolayer 1T${}^{\prime }$-MoTe${}_2$
• Superconducting gap modulations: are they from pair density waves or pair-breaking scattering?
• Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal YbV${}_6$Sn${}_6$
• Electronic structure of topological defects in the pair density wave superconductor
• Strong pair-density-wave fluctuations in an exactly solvable doped Mott insulator
• Enhanced pair-density-wave vertices in a bilayer Hubbard model at half-filling
• Finite-momentum and field-induced pairings in orbital-singlet spin-triplet superconductors
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• The feedback driven atomic scale Josephson microscope
• Critical Behavior and Duality in Dimensionally Reduced Planar Chern-Simons Superconductors
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• Emergent Pair Density Wave Order Across a Lifshitz Transition
• Superconducting gap and its Little-Parks like oscillations with high-order harmonics in lithium intercalated 1T-TiSe${}_2$
• Moire Engineering of Cooper-Pair Density Modulation States
• Pair-density-wave phase of strongly interacting electrons on the triangular lattice: A variational Monte Carlo study
• Competing pair density wave orders in the square lattice $t$-$J$ model
• Visualizing Pair-breaking Scattering Interference in Bulk FeSe
• Evidence for valence-bond pairing in a one-dimensional two-orbital system
• Novel dynamical excitations and roton-based measurement of Cooper-pair momentum in a two-dimensional Fulde-Ferrell-Larkin-Ovchinnikov superfluid on optical lattices
• Spin-triplet pair density wave superconductors
• Evidence of intertwined pair density and charge density wave orders in UTe2
• Probing Quantum Geometric Phases via Scanning Tunneling Microscopy
• Topological pair density waves in kagome superconductors
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control
• A Landau Theory for Pair Density Modulation in Fe(Te,Se) flakes