Electron-boson-interaction induced particle-hole symmetry breaking of conductance into subgap states in superconductors

Abstract

Particle-hole symmetry (PHS) of conductance into subgap states in superconductors is a fundamental consequence of a noninteracting mean-field theory of superconductivity. The breaking of this PHS has been attributed to a noninteracting mechanism, i.e., quasiparticle poisoning (QP), a process detrimental to the coherence of superconductor-based qubits.Here, we show that the ubiquitous electron-boson interactions in superconductors can also break the PHS of subgap conductances. We study the effect of such couplings on the PHS of subgap conductances in superconductors using both the rate equation and Keldysh formalism, which have different regimes of validity. In both regimes, we found that such couplings give rise to a particle-hole $asymmetry$ in subgap conductances which increases with increasing coupling strength, increasing subgap-state particle-hole content imbalance and decreasing temperature. Our proposed mechanism is general and applies even for experiments where the subgap-conductance PHS breaking cannot be attributed to QP.

arXiv comment6 pages, 4 figures, 18 pages of Supplemental material. Published version

References in corpus (56)

• Fault-tolerant quantum computation by anyons
• Non-Abelian Anyons and Topological Quantum Computation
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Coupling Superconducting Qubits via a Cavity Bus
• Majorana Fermion Induced Resonant Andreev Reflection
• Hamiltonian approach to the transport properties of superconducting quantum point contacts
• Phonon effects in molecular transistors: Quantum and classical treatment
• Tunneling characteristic of a chain of Majorana bound states
• Scaling of Majorana Zero-Bias Conductance Peaks
• Andreev bound states versus Majorana bound states in quantum dot-nanowire-superconductor hybrid structures: Trivial versus topological zero-bias conductance peaks
• Evidence of topological superconductivity in planar Josephson junctions
• Keldysh technique and non-linear sigma-model: basic principles and applications
• Near-zero-energy end states in topologically trivial spin-orbit coupled superconducting nanowires with a smooth confinement
• Ballistic Majorana nanowire devices
• Topological Superconductivity in a Phase-Controlled Josephson Junction
• Majorana qubit decoherence by quasiparticle poisoning
• Quantum point contact as a probe of a topological superconductor
• Nonequilibrium quasiparticles and $2e$ periodicity in single-Cooper-pair transistors
• Dephasing in Quantum Dots: Quadratic Coupling to Acoustic Phonons
• Nonlocality of Majorana Modes in Hybrid Nanowires
• Zero-Energy Modes from Coalescing Andreev States in a Two-Dimensional Semiconductor-Superconductor Hybrid Platform
• Thermopower of Single-Molecule Devices
• Two-dimensional topological superconductivity in Pb/Co/Si(111)
• Parity lifetime of bound states in a proximitized semiconductor nanowire
• Topological superconductivity in full shell proximitized nanowires
• Flux-induced topological superconductivity in full-shell nanowires
• Flux-induced Majorana modes in full-shell nanowires
• Signature of Dispersing 1D Majorana Channels in an Iron-based Superconductor
• Non-Majorana states yield nearly quantized conductance in superconductor-semiconductor nanowire devices
• Tunneling processes into localized subgap states in superconductors
• Three dimensional collective charge excitations in electron-doped cuprate superconductors
• Ubiquitous non-Majorana Zero-Bias Conductance Peaks in Nanowire Devices
• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Failure of protection of Majorana based qubits against decoherence
• Observation of Lattice and Andreev Bound States of Vortices in Ba0.6K0.4Fe2As2 Single Crystals with Scanning Tunneling Microscopy/Spectroscopy
• Mapping the orbital structure of impurity bound states in a superconductor
• Discrete energy levels of Caroli-de Gennes-Martricon states in quantum limit due to small Fermi energy in FeTe${}_{0.55}$Se${}_{0.45}$
• Decay rates for topological memories encoded with Majorana fermions
• Transport signatures of quasiparticle poisoning in a Majorana island
• Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires
• Dephasing of Majorana-based qubits
• Role of dissipation in realistic Majorana nanowires
• Spin-polarized Yu-Shiba-Rusinov states in an iron based superconductor
• How to infer non-Abelian statistics and topological invariants from tunneling conductance properties of realistic Majorana nanowires
• Probing confined phonon modes by transport through a nanowire double quantum dot
• Coherent Electron-Phonon Coupling in Tailored Quantum Systems
• Tuning interactions between spins in a superconductor
• Nonlinearity in NS transport: scattering matrix approach
• Conductance spectroscopy of topological superconductor wire junctions
• Microwave detection of electron-phonon interactions in a cavity-coupled double quantum dot
• Interfering tunneling paths through magnetic molecules on superconductors: Asymmetries of Kondo and Yu-Shiba-Rusinov resonances
• Non-equilibrium theory of tunneling into localized state in superconductor
• Photon-assisted resonant Andreev reflections: Yu-Shiba-Rusinov and Majorana states
• Conductance asymmetries in mesoscopic superconducting devices due to finite bias
• Temperature Induced Shifts of Yu-Shiba-Rusinov Resonances in Nanowire-Based Hybrid Quantum Dots

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• Quantum transport through a quantum dot side-coupled to a Majorana bound state pair in the presence of electron-phonon interaction
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