Charge and spin transport through normal lead coupled to $s$-wave superconductor and a Majorana zero mode

Abstract

Zero-bias charge conductance peak (ZBCCP) is a significant symbol of Majorana zero modes (MZMs). The proximity effect of s-wave superconductor is usually demanded in the fabrication of MZMs. So in transport experiments, the system is inevitably coupled to the s-wave superconductor. Here we study how the ZBCCP is affected by coupling of the s-wave superconductor. The results show that the ZBCCP could be changed into a zero-bias valley due to the coupling of s-wave superconductor, although the conductance at the zero bias still keeps a quantized value $2e^2/h$. So it does not mean no MZM exists when no ZBCCP is experimentally observed. In addition, the spin transport is investigated. Four reflection processes (the normal reflection, spin-flip reflection, normal Andreev reflection, and equal-spin Andreev reflection) usually occur. The reflection coefficients are strongly dependent on the spin direction of the incident electron, and they may be symmetrical or Fano resonance shapes. But the spin conductance always shows a zero-bias peak with the height $e/2\pi$ regardless of the direction of the spin bias and the coupling strength of the s-wave superconductor. So measuring spin transport properties could be a more reliable method to judge the existence of MZMs.

arXiv comment8 pages, 5 figures

References in corpus (50)

• Fault-tolerant quantum computation by anyons
• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Helical liquids and Majorana bound states in quantum wires
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Direct electronic measurement of the spin Hall effect
• Realizing Majorana zero modes in superconductor-semiconductor heterostructures
• Majorana Fermion Induced Resonant Andreev Reflection
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Colloquium: Majorana Fermions in nuclear, particle and solid-state physics
• Evidence for Majorana bound state in an iron-based superconductor
• Observation of topological superconductivity on the surface of an iron-based superconductor
• Observation of Majorana fermions with spin selective Andreev reflection in the vortex of topological superconductor
• Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures
• Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• Quantized Majorana conductance
• Zero-bias peaks in spin-orbit coupled superconducting wires with and without Majorana end-states
• Scaling of Majorana Zero-Bias Conductance Peaks
• On A Proper Definition of Spin Current
• Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions
• Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
• Zero-voltage conductance peak from weak antilocalization in a Majorana nanowire
• Detecting a Majorana-Fermion Zero Mode Using a Quantum Dot
• Topological Superconductor Bi2Te3/NbSe2 heterostructures
• Kondo Correlations and the Fano Effect in Closed AB-Interferometers
• Quantum point contact as a probe of a topological superconductor
• Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor
• Reproducing topological properties with quasi-Majorana states
• Experimental Phase Diagram of a One-Dimensional Topological Superconductor
• Flux-induced Majorana modes in full-shell nanowires
• Topological superconductivity in full shell proximitized nanowires
• Flux-induced topological superconductivity in full-shell nanowires
• Observation of spin current in quantum spin liquid
• Selective Equal-Spin Andreev Reflections Induced by Majorana Fermions
• Bias-controllable intrinsic spin polarization in a quantum dot
• Quantum transport through a graphene nanoribbon-superconductor junction
• Persistent spin current in nano-devices and definition of the spin current
• Controllable Andreev retroreflection and specular Andreev reflection in a four-terminal graphene-superconductor hybrid system
• Detection of a Majorana-fermion zero mode by a T-shaped quantum-dot structure
• Spin-dependent zero-bias peak in a hybrid nanowire-quantum dot system: Distinguishing isolated Majorana fermions from Andreev bound states
• Fano Resonances in Majorana Bound States - Quantum Dot Hybrid Systems
• Double quantum dot as detector of spin bias
• Majorana oscillations modulated by Fano interference and dregree of non-locality in a topological superconducting nanowire-quantum dot system
• Fano resonance in a two-level quantum dot side-coupled to leads
• Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot
• Spin-flip reflection at the normal metal-spin superconductor interface

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