Topological Ultranodal pair states in iron-based superconductors

Abstract

Bogoliubov Fermi surfaces are contours of zero-energy excitations that are protected in the superconducting state. Here we show that multiband superconductors with dominant spin singlet, intraband pairing of spin-1/2 electrons can undergo a transition to a state with Bogoliubov Fermi surfaces if spin-orbit coupling, interband pairing and time reversal symmetry breaking are also present. These latter effects may be small, but drive the transition to the topological state for appropriate nodal structure of the intra-band pair. Such a state should display nonzero zero-bias density of states and corresponding residual Sommerfeld coefficient as for a disordered nodal superconductor, but occurring even in the pure case. We present a model appropriate for iron-based superconductors where the topological transition associated with creation of a Bogoliubov Fermi surface can be studied. The model gives results that strongly resemble experiments on FeSe${}_{1-x}$S${}_x$ across the nematic transition, where this ultranodal behavior may already have been observed.

arXiv comment7 pages, 2 figures

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Cited by in corpus (42)

• Exotic Superconducting States in FeSe-based Materials
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Pure nematic quantum critical point accompanied by a superconducting dome
• d-wave superconductivity and Bogoliubov-Fermi surfaces in Rarita-Schwinger-Weyl semimetals
• Exceeding the Landau superflow speed limit with topological Bogoliubov Fermi surfaces
• Bogoliubov-Fermi Surfaces in Noncentrosymmetric Multicomponent Superconductors
• Bogoliubov Fermi Surfaces in Spin-1/2 Systems: Model Hamiltonians and Experimental Consequences
• Superconductivity in spin-$3/2$ systems: symmetry classification, odd-frequency pairs, and Bogoliubov Fermi surfaces
• Two superconducting states with broken time-reversal symmetry in FeSe1-xSx
• Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\text{Fe}{\text{Se}}_{1-x}{\text{S}}_x$
• Possible superconductivity with Bogoliubov Fermi surface in lightly doped Kagome U(1) spin liquid
• Instability of $j=3/2$ Bogoliubov Fermi-surfaces
• Odd-frequency pairing inherent in Bogoliubov Fermi liquid
• Bogoliubov-Fermi surface with inversion symmetry and electron-electron interactions: relativistic analogies and lattice theory
• Distortional weak-coupling instability of Bogoliubov Fermi surfaces
• Multipolar superconductivity in Luttinger semimetals
• Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe
• Topological nodal line in superfluid ${}^3$He and the Anderson theorem
• Using Disorder to Identify Bogoliubov Fermi-Surface States
• Roadmap on Nanoscale Superconductivity for Quantum Technologies
• Nodal pair density waves from a quarter-metal in crystalline graphene multilayers
• Identifying Bogoliubov Fermi surfaces via thermoelectric response in a $d$-wave superconductor heterostructure
• Odd-Parity Spin-Triplet Superconductivity in Centrosymmetric Antiferromagnetic Metals
• Electronic Stripe Patterns Near the Fermi Level of Tetragonal Fe(Se,S)
• Nematic Bogoliubov Fermi surfaces from magnetic toroidal order in FeSe${}_{1-x}$S${}_x$
• Surface density of states and tunneling spectroscopy of a spin-3/2 superconductor with Bogoliubov Fermi Surfaces
• Time reversal symmetry breaking and $d$-wave superconductivity of triple-point fermions
• Topological multiband s-wave superconductivity in coupled multifold fermions
• Microscopic origin of ultranodal superconducting states in spin-1/2 systems
• Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors
• Triplet-Superconductivity in Triple-Band Crossings
• Coexistence of Chiral Majorana Edge States and Bogoliubov Fermi Surfaces in Two-Dimensional Nonsymmorphic Dirac Semimetal/Superconductor Heterostructures
• Unveiling the quasiparticle behaviour in the pressure-induced high-$T_c$ phase of an iron-chalcogenide superconductor
• Lifting of gap nodes by disorder in ultranodal superconductor candidate FeSe1-xSx
• Classification of multiorbital superconducting state based on augmented multipoles
• Spin fluctuations in the ultranodal superconducting state of Fe(Se,S)
• Many-body selection rule for quasiparticle pair creations in centrosymmetric superconductors
• Odd-frequency pairing of Bogoliubov quasiparticles in superconductor junction
• Thermoelectric effect in a superconductor with Bogoliubov Fermi surfaces
• Altermagnetism Induced Bogoliubov Fermi Surfaces Form Topological Superconductivity
• Evolution and Instability of Bogoliubov Fermi Surfaces under Zeeman Field