Coherent coupling between vortex bound states and magnetic impurities in 2D layered superconductors

Abstract

Bound states in superconductors are expected to exhibit a spatially resolved electron-hole asymmetry which is the hallmark of their quantum nature. This asymmetry manifests as oscillations at the Fermi wavelength, which is usually tiny and thus washed out by thermal broadening or by scattering at defects. Here we demonstrate theoretically and confirm experimentally that, when coupled to magnetic impurities, bound states in a vortex core exhibit an emergent axial electron-hole asymmetry on a much longer scale, set by the coherence length. We study vortices in 2H-NbSe${}_2$ and in 2H-NbSe${}_{1.8}$S_{0.2}$ with magnetic impurities, characterizing these with detailed Hubbard-corrected density functional calculations. We find that the induced electron-hole imbalance depends on the band character of the superconducting material. Our results open interesting prospects for the study of coupled superconducting bound states.

References in corpus (27)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• New directions in the pursuit of Majorana fermions in solid state systems
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Search for Majorana fermions in superconductors
• Scanning tunneling spectroscopy of high-temperature superconductors
• Majorana fermions emerging from magnetic nanoparticles on a superconductor without spin-orbit coupling
• End states and subgap structure in proximity-coupled chains of magnetic adatoms
• Observing Majorana Bound States in p-wave Superconductors Using Noise Measurements in Tunneling Experiments
• Long range coherent magnetic bound states in superconductors
• Single magnetic adsorbates on s-wave superconductors
• Low-lying Quasiparticle Excitations around a Vortex Core in Quantum Limit
• Topologically protected surface states in a centrosymmetric superconductor beta-PdBi2
• Anisotropic Impurity-States, Quasiparticle Scattering and Nematic Transport in Underdoped Ca(Fe1-xCox)2As2
• Local Electronic Structure of a Single Magnetic Impurity in a Superconductor
• Coupled Yu-Shiba-Rusinov states in molecular dimers on NbSe${}_2$
• Experimental Observation of Topological Superconductivity and Majorana Zero Modes on beta-Bi2Pd Thin Films
• Intrinsic atomic scale modulations of the superconducting gap of 2H-NbSe2
• Probing magnetic interactions between Cr adatoms on the $\beta$-Bi${}_2$Pd superconductor
• Magnetic field dependence of the density of states in the multiband superconductor $\beta$-Bi${}_2$Pd
• Imaging atomic-scale effects of high-energy ion irradiation on superconductivity and vortex pinning in Fe(Se,Te)
• Yu-Shiba-Rusinov states in the charge-density modulated superconductor NbSe2
• On the field dependence of the vortex core size
• Field dependence of the vortex core size probed by STM
• Resistance of Layered Superclean Superconductors at Low Temperatures
• Friedel Oscillations of Vortex Bound States Under Extreme Quantum Limit in KCa2Fe4As4F2
• Probing vortex Majorana fermions and topology in semiconductor-superconductor heterostructures
• Large spectral gap and impurity-induced states in a two-dimensional Abrikosov vortex

Cited by in corpus (5)

• Necklace-like pattern of vortex bound states
• Negative differential resistance state in the free-flux-flow regime of driven vortices in a single crystal of 2H-NbS${}_2$
• Enhancement of vortex liquid phase and reentrant behavior in NiBi3 single crystals
• Yu-Shiba-Rusinov multiplets and clusters of multiorbital adatoms in superconducting substrates: Subgap Green's function approach
• Quantum interference among vortex bound states in superconductors