Tuning the coupling of an individual magnetic impurity to a superconductor: quantum phase transition and transport

Abstract

The exchange scattering at magnetic adsorbates on superconductors gives rise to Yu-Shiba-Rusinov (YSR) bound states. Depending on the strength of the exchange coupling, the magnetic moment perturbs the Cooper pair condensate only weakly, resulting in a free-spin ground state, or binds a quasiparticle in its vicinity, leading to a (partially) screened spin state. Here, we use the flexibility of Fe-porphin molecules adsorbed on a Pb(111) surface to reversibly and continuously tune between these distinct ground states. We find that the FeP moment is screened in the pristine adsorption state. Approaching the tip of a scanning tunneling microscope, we exert a sufficiently strong attractive force to tune the molecule through the quantum phase transition into the free-spin state. We ascertain and characterize the transition by investigating the transport processes as function of tip-molecule distance, exciting the YSR states by single-electron tunneling as well as (multiple) Andreev reflections.

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• Spin-polarized Yu-Shiba-Rusinov states in an iron based superconductor
• Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers
• Yu-Shiba-Rusinov states in the charge-density modulated superconductor NbSe2
• Enhancing the Josephson diode effect with Majorana bound states
• Quantum spins and hybridization in artificially-constructed chains of magnetic adatoms on a superconductor
• Observation of magnetic adatom-induced Majorana vortex and its hybridization with field-induced Majorana vortex in an iron-based superconductor
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• Coupled Yu-Shiba-Rusinov states induced by a many-body molecular spin on a superconductor
• Photon-assisted tunneling at the atomic scale: Probing resonant Andreev reflections from Yu-Shiba-Rusinov states
• The fate of the Kondo cloud in a superconductor
• Interfering tunneling paths through magnetic molecules on superconductors: Asymmetries of Kondo and Yu-Shiba-Rusinov resonances
• Long range and highly tunable interaction between local spins coupled to a superconducting condensate
• Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor ${\mathrm{FeTe}}_{0.55}{\mathrm{Se}}_{0.45}$
• Superconducting Quantum Interference at the Atomic Scale
• A many-body approach to transport in quantum systems: From the transient regime to the stationary state
• Interplay Between Yu-Shiba-Rusinov States and Multiple Andreev Reflections
• Quantum magnetism and topological superconductivity in Yu-Shiba-Rusinov chains
• Dynamical quantum phase transitions in a mesoscopic superconducting system
• Photon-assisted resonant Andreev reflections: Yu-Shiba-Rusinov and Majorana states
• Practical Guide to Quantum Phase Transitions in Quantum-Dot-Based Tunable Josephson Junctions
• Microscopic charging and in-gap states in superconducting granular aluminum
• Pair excitations of a quantum spin on a proximitized superconductor
• Large spatial extension of the zero-energy Yu-Shiba-Rusinov state in magnetic field
• From Cooper pair splitting to the non-local spectroscopy of a Shiba state
• Identification of topological superconductivity in magnetic impurity systems using bulk spin-polarization
• Magnetic impurity in a one-dimensional few-fermion system
• Tunneling processes between Yu-Shiba-Rusinov bound states
• Resonance-enhanced vibrational spectroscopy of molecules on a superconductor
• Tuning the Spin Interaction in Non-planar Organic Diradicals Through Mechanical Manipulation
• Extending the spin excitation lifetime of a magnetic molecule on a proximitized superconductor
• Zeeman effects on Yu-Shiba-Rusinov states
• Majorana quasiparticles in atomic spin chains on superconductors
• Impurity-induced resonant spinon zero modes in Dirac quantum spin-liquids
• Magnetic-Field-Induced Transition in a Quantum Dot Coupled to a Superconductor
• Nanoscale Control of Quantum States in Radical Molecules on Superconducting Pb(111)
• Yu-Shiba-Rusinov states in 2D superconductors with arbitrary Fermi contours
• Tuning the electronic states and superconductivity in alkali fulleride films
• Magnetic Impurities on Superconducting Surfaces: Phase Transitions and the Role of Impurity-Substrate Hybridization
• Universal scaling of tunable Yu-Shiba-Rusinov states across the quantum phase transition
• Yu-Shiba-Rusinov bands in a self-assembled kagome lattice of magnetic molecules
• Systematic study of Mn atoms, artificial dimers and chains on superconducting Ta(110)
• Tracking a Spin-Polarized Superconducting Bound State across a Quantum Phase Transition
• Full Counting Statistics of Yu-Shiba-Rusinov Bound States
• Yu-Shiba-Rusinov States and Ordering of Magnetic Impurities Near the Boundary of a Superconducting Nanowire
• Hamiltonian learning with real-space impurity tomography in topological moire superconductors
• Probing and dressing magnetic impurities in a superconductor
• Phase shift and magnetic anisotropy induced field splitting of impurity states in (Li1-xFex)OHFeSe superconductor
• Observation of Yu-Shiba-Rusinov-like states at the edge of CrBr3/NbSe2 heterostructure
• Effect of Van Hove singularities on Shiba states in two-dimensional $s$-wave superconductors
• Controlling Majorana hybridization in magnetic chain-superconductor systems
• Quantum phase transition in magnetic nanographenes on a lead superconductor
• Yu-Shiba-Rusinov states in a superconductor with topological Z2 bands
• Magnetic bound states embedded in tantalum superconducting thin films
• Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K${}_3$C${}_{60}$
• Study of Yu-Shiba-Rusinov bound states by tuning the electron density at the Fermi energy
• Control of Yu-Shiba-Rusinov States through a Bosonic Mode
• RKKY interaction in triplet superconductors: Dzyaloshinskii-Moriya-type interaction mediated by spin-polarized Cooper pairs
• High-Resolution Spectroscopy of the Intermediate Impurity States near a Quantum Phase Transition
• Gap inversion in one-dimensional Andreev crystals
• Control of Andreev Reflection via a Single-Molecule Orbital
• Quantifying the quantum nature of high spin YSR excitations in transverse magnetic field
• Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor
• Magnetic flux induced topological superconductivity in magnetic atomic rings
• Spectral properties of Andreev crystals
• Signatures of Amorphous Shiba State in FeTe${}_{0.55}$Se${}_{0.45}$
• Observation of Yu-Shiba-Rusinov states in superconducting graphene
• In-gap states of magnetic impurity in quantum spin Hall insulator proximitized to a superconductor
• Odd-parity ground state in dilute Yu-Shiba-Rusinov dimers and chains
• Temperature dependent energy gap for Yu-Shiba-Rusinov states at the quantum phase transition
• Fermi-Level Pinning of Yu-Shiba-Rusinov States in a Superconductor with Weakly Broken Spin-Rotational Invariance
• Fractional spin excitations and conductance in the spiral staircase Heisenberg ladder
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• Nanoscale functionalized superconducting transport channels as photon detectors
• Dynamical Coulomb Blockade as a Signature of the Sign-Reversing Cooper Pairing Potential
• Direct observation of intrinsic surface magnetic disorder in amorphous superconducting films
• Yu-Shiba-Rusinov bound states boost odd-frequency superconductivity
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• Merohedral disorder and impurity impacts on superconductivity of fullerenes
• Diode effect in microwave irradiated Josephson junctions with Yu-Shiba-Rusinov states