Characterizing unconventional superconductors from the spin structure of impurity-induced bound states

Abstract

Cooper pairs in two-dimensional unconventional superconductors with broken inversion symmetry are in a mixture of an even-parity spin-singlet pairing state with an odd-parity spin-triplet pairing state. We study the magnetic properties of the impurity bound states in such superconductors and find striking signatures in their spin polarization which allow to unambiguously discriminate a non-topological superconducting phase from a topological one. Moreover, we show how these properties, which could be measured using spin-polarized scanning tunneling microscopy (STM), also enable to determine the direction of the spin-triplet pairing vector of the host material and thus to distinguish between different types of unconventional pairing.

11 pages + 9 pages of supplementary information, 9 figures + 8 figures (SI)

References in corpus (10)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• Topological spin-current in non-centrosymmetric superconductors
• Magnetic anisotropy in Shiba bound states across a quantum phase transition
• Surface bound states and spin currents in non-centrosymmetric superconductors
• Impurity-induced bound states in superconductors with spin-orbit coupling
• Impurity and interface bound states in $d_{x^2-y^2}+i{d}_{xy}$ and $p_x+i{p}_y$ superconductors
• Transport signatures of superconducting hybrids with mixed singlet and chiral triplet states
• Impurity resonance states in noncentrosymmetric superconductor $CeP{t}_{3}Si$: a probe for Cooper-pairing symmetry
• Non-magnetic impurity effects in a three-dimensional topological superconductor: From p- to s-wave behaviors

Cited by in corpus (28)

• Two-dimensional topological superconductivity in Pb/Co/Si(111)
• Single magnetic adsorbates on s-wave superconductors
• Interfering tunneling paths through magnetic molecules on superconductors: Asymmetries of Kondo and Yu-Shiba-Rusinov resonances
• Yu-Shiba-Rusinov states of impurities in a triangular lattice of NbSe${}_2$ with spin orbit coupling
• Topological superconductivity from magnetic impurities on monolayer NbSe${}_2$
• Quantum magnetism and topological superconductivity in Yu-Shiba-Rusinov chains
• Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors
• Identifying Majorana bound states by tunneling shot-noise tomography
• Asymptotic behavior of impurity-induced bound states in low-dimensional topological superconductors
• Impurity bound states in fully gapped $d$-wave superconductors with subdominant order parameters
• Skyrmion-induced subgap states in p-wave superconductors
• Topological state engineering by potential impurities on chiral superconductors
• Obtaining Majorana and other boundary modes from the metamorphosis of impurity-induced states: exact solutions via T-matrix
• Impact of topology on the impurity effects in extended $s$-wave superconductors with spin-orbit coupling
• Probing chiral edge states in topological superconductors through spin-polarized local density of state measurements
• Spin-triplet superconductor$-$quantum anomalous Hall insulator$-$spin-triplet superconductor Josephson junctions: $0$-$\pi$ transition, ${\varphi }_0$ phase and switch effects
• Friedel oscillations and Majorana zero modes in inhomogeneous superconductors
• Determining the spin-orbit coupling via spin-polarized spectroscopy of magnetic impurities
• Quasiparticle focusing of bound states in two-dimensional $s$-wave superconductors
• Yu-Shiba-Rusinov States and Ordering of Magnetic Impurities Near the Boundary of a Superconducting Nanowire
• Anomalous Hall effect in single-band chiral superconductors from impurity superlattices
• Topology from Triviality
• Engineering 1D topological phases on $p$-wave superconductors
• Robust Spin Polarization of Yu-Shiba-Rusinov States in Superconductor/Ferromagnetic Insulator Heterostructures
• Visualizing Pairing Symmetry in Nematic Superconductors using spin-polarized spectroscopy of magnetic impurities
• Anisotropy of Yu-Shiba-Rusinov states in NbSe${}_2$
• Interplay between pairing and correlations in spin-polarized bound states
• Chiral $p-$wave superconductivity in Pb${}_{1-x}$Sn${}_x$Te: signatures from bound-state spectra and wavefunctions