Transport signatures of a quantum spin Hall - chiral topological superconductor junction
arXiv:1904.02984 · doi:10.1103/PhysRevB.101.235308
Abstract
We investigate transport through a normal-superconductor (NS) junction made from a quantum spin Hall (QSH) system with helical edge states and a two-dimensional (2D) chiral topological superconductor (TSC) having a chiral Majorana edge mode. We employ a two-dimensional extended four-band model for HgTe-based quantum wells in a magnetic (Zeeman) field and subject to s-wave superconductivity. We show using the Bogoliubov-de Gennes scattering formalism that this structure provides a striking transport signal of a 2D TSC. As a function of the sample width (or Fermi energy) the conductance resonances go through a sequence of (non-trivial phase) and plateaux (trivial phase) which fall within the region of a non-zero Chern number (2D limit) as the sample width becomes large. These signatures are a manifestation of the topological nature of the QSH effect and the TSC.
arXiv comment13 pages, 9 figures
References in corpus (48)
- Topological Insulators
- Topological insulators and superconductors
- Quantum Spin Hall Effect in Graphene
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Topological Order and the Quantum Spin Hall Effect
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
- 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
- Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
- Exponential Protection of Zero Modes in Majorana Islands
- Majorana Fermion Induced Resonant Andreev Reflection
- The Quantum Spin Hall Effect: Theory and Experiment
- Quantum Spin Hall Effect in Inverted Type II Semiconductors
- Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures
- Quantized Majorana conductance
- Finite size effects of helical edge states in HgTe/CdTe quantum wells
- Chiral Majorana edge state in a quantum anomalous Hall insulator-superconductor structure
- Majorana Fermions in Semiconductor Nanowires
- Probing Atomic Structure and Majorana Wavefunctions in Mono-Atomic Fe-chains on Superconducting Pb-Surface
- Topological Quantum Computation Based on Chiral Majorana Fermions
- Multichannel Generalization of Kitaev's Majorana End States and a Practical Route to Realize Them in Thin Films
- Quantized conductance at the Majorana phase transition in a disordered superconducting wire
- Single valley Dirac fermions in zero-gap HgTe quantum wells
- Search for Majorana fermions in multiband semiconducting nanowires
- Quantum point contact as a probe of a topological superconductor
- Chiral topological superconductor and half-integer conductance plateau from quantum anomalous Hall plateau transition
- Scattering formula for the topological quantum number of a disordered multi-mode wire
- Fingerprint of Different Spin-Orbit Terms for Spin Transport in HgTe Quantum Wells
- Majorana bound states without vortices in topological superconductors with electrostatic defects
- Conductance and noise signatures of Majorana backscattering
- A mechanism of conductance plateau without 1D chiral Majorana fermions
- Disorder-induced half-integer quantized conductance plateau in quantum anomalous Hall insulator-superconductor structures
- Deterministic creation and braiding of chiral edge vortices
- Probing the helical edge states of a topological insulator by Cooper-pair injection
- Low-energy sub-gap states in multi-channel Majorana wires
- Quantum phase transition of chiral Majorana fermion in the presence of disorder
- Crossover from Majorana edge to end states in quasi-one-dimensional p-wave superconductors
- Signatures of Rashba spin-orbit interaction in the superconducting proximity effect in helical Luttinger liquids
- Dephasing-enabled triplet Andreev conductance
- Generic helical edge states due to Rashba spin-orbit coupling in a topological insulator
- Disorder and magnetic-field induced breakdown of helical edge conduction in an inverted electron-hole bilayer
- Chiral Majorana edge states in HgTe quantum wells
- Helical edge states in multiple topological mass domains
- Gate defined wires in HgTe quantum wells: from Majorana fermions to spintronics
- Interplay of bulk and edge states in transport of two-dimensional topological insulators
- Conductance oscillations and speed of chiral Majorana mode in a quantum-anomalous-Hall 2d strip