Topological Phase Detection in Rashba Nanowires with a Quantum Dot

Abstract

We study theoretically the detection of the topological phase transition occurring in Rashba nanowires with proximity-induced superconductivity using a quantum dot. The bulk states lowest in energy of such a nanowire have a spin polarization parallel or antiparallel to the applied magnetic field in the topological or trivial phase, respectively. We show that this property can be probed by the quantum dot created at the end of the nanowire by external gates. By tuning one of the two spin-split levels of the quantum dot to be in resonance with nanowire bulk states, one can detect the spin polarization of the lowest band via transport measurement. This allows one to determine the topological phase of the Rashba nanowire independently of the presence of Majorana bound states.

References in corpus (26)

• 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
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Electrically detected interferometry of Majorana fermions in a topological insulator
• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• Transport spectroscopy of NS nanowire junctions with Majorana fermions
• Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions
• Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
• Distinguishing a Majorana zero mode using spin resolved measurements
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
• Transition from fractional to Majorana fermions in Rashba nanowires
• Majorana End-States in Multi-band Microstructures with Rashba Spin-Orbit Coupling
• Majorana bound states and non-local spin correlations in a quantum wire on an unconventional superconductor
• On controlling the bound states in quantum-dot hybrid-nanowire
• Giant spin orbit interaction due to rotating magnetic fields in graphene nanoribbons
• Mutation of Andreev into Majorana bound states in long NS and SNS junctions
• Fermionic and Majorana Bound States in Hybrid Nanowires with Non-Uniform Spin-Orbit Interaction
• Majorana Fermions in Ge/Si Hole Nanowires
• Current and noise correlations in a double dot Cooper pair beam splitter
• Supercurrent interference in few-mode nanowire Josephson junctions
• Spin-resolved interference due to Majorana state on interface between normal and superconducting leads
• Probing Majorana-like states in quantum dots and quantum rings
• Zero-energy bound state at the interface between an $s$-wave superconductor and a disordered normal metal with repulsive electron-electron interactions

Cited by in corpus (7)

• On controlling the bound states in quantum-dot hybrid-nanowire
• Majorana Fermions in Magnetic Chains
• Spectroscopy of the superconducting proximity effect in nanowires using integrated quantum dots
• Entangling Spins in Double Quantum Dots and Majorana Bound States
• Absence of supercurrent sign reversal in a topological junction with a quantum dot
• Influence of long-range interaction on Majorana zero modes
• Majorana bound states in topological insulators with hidden Dirac points