Topological superconductivity in semiconductor-superconductor-magnetic insulator heterostructures

Abstract

Hybrid superconductor-semiconductor heterostructures are promising platforms for realizing topological superconductors and exploring Majorana bound states physics. Motivated by recent experimental progress, we theoretically study how magnetic insulators offer an alternative to the use of external magnetic fields for reaching the topological regime. We consider different setups, where: (1) the magnetic insulator induces an exchange field in the superconductor, which leads to a splitting in the semiconductor by proximity effect, and (2) the magnetic insulator acts as a spin-filter tunnel barrier between the superconductor and the semiconductor. We show that the spin splitting in the superconductor alone cannot induce a topological transition in the semiconductor. To overcome this limitation, we propose to use a spin-filter barrier that enhances the magnetic exchange and provides a mechanism for a topological phase transition. Moreover, the spin-dependent tunneling introduces a strong dependence on the band alignment, which can be crucial in quantum-confined systems. This mechanism opens up a route towards networks of topological wires with fewer constraints on device geometry compared to previous devices that require external magnetic fields.

arXiv comment9+5 pages, 6 figures

References in corpus (28)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Unpaired Majorana fermions in quantum wires
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Helical liquids and Majorana bound states in quantum wires
• A generic new platform for topological quantum computation using semiconductor heterostructures
• Non-Abelian statistics and topological quantum information processing in 1D wire networks
• Realizing Majorana zero modes in superconductor-semiconductor heterostructures
• Scalable Designs for Quasiparticle-Poisoning-Protected Topological Quantum Computation with Majorana Zero Modes
• Milestones toward Majorana-based quantum computing
• Evidence of topological superconductivity in planar Josephson junctions
• Two-dimensional epitaxial superconductor-semiconductor heterostructures: A platform for topological superconducting networks
• Topological invariants for spin-orbit coupled superconductor nanowires
• Topological Superconductivity in a Planar Josephson Junction
• Two-dimensional platform for networks of Majorana bound states
• Colloquium: Nonequilibrium effects in superconductors with a spin-splitting field
• Signature of a pair of Majorana zero modes in superconducting gold surface states
• Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires
• Selective Area Grown Semiconductor-Superconductor Hybrids: A Basis for Topological Networks
• Revealing the magnetic proximity effect in EuS/Al bilayers through superconducting tunneling spectroscopy
• Semiconductor - Ferromagnetic Insulator - Superconductor Nanowires: Stray Field and Exchange Field
• Proximity-induced low-energy renormalization in hybrid semiconductor-superconductor Majorana structures
• Spin-polarized quasiparticle transport in exchange-split superconducting aluminum on europium sulfide
• Spin splitting induced in a superconductor by an antiferromagnetic insulator
• Temperature-dependent quasiparticle band structure of the ferromagnetic semiconductor EuS
• Measurement of the spin polarization of the magnetic semiconductor EuS with zero-field and Zeeman-split Andreev reflection spectroscopy
• Ferromagnetic EuS films: Magnetic stability, electronic structure and magnetic surface states
• Phase-Controllable Nonlocal Spin Polarization in Proximitized Nanowires

Cited by in corpus (22)

• Majorana nanowires for topological quantum computation
• Geometry controlled superconducting diode and anomalous Josephson effect triggered by the topological phase transition in curved proximitized nanowires
• Nonsinusoidal current-phase relations in semiconductor-superconductor-ferromagnetic insulator devices
• Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic insulator islands
• Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
• Tunable proximity effects and topological superconductivity in ferromagnetic hybrid nanowires
• Topological superconductivity in nanowires proximate to a diffusive superconductor-magnetic insulator bilayer
• Semiconductor-ferromagnet-superconductor planar heterostructures for 1D topological superconductivity
• Topological superconductivity in tripartite superconductor-ferromagnet-semiconductor nanowires
• Mitigating disorder-induced zero-energy states in weakly-coupled semiconductor-superconductor hybrid systems
• Phenomenology of Majorana zero modes in full-shell hybrid nanowires
• Robust topological superconductivity in weakly coupled nanowire-superconductor hybrid structures
• Fluxoid-induced pairing suppression and near-zero modes in quantum dots coupled to full-shell nanowires
• Topological superconductivity in a magnetic-texture coupled Josephson junction
• Optimizing the topological properties of stacking semiconductor-ferromagnet-superconductor heterostructures
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Minimal Zeeman field requirement for a topological transition in superconductors
• Quantum Simulation of Quantum Phase Transitions Using the Convex Geometry of Reduced Density Matrices
• Zero-bias conductance peaks at zero applied magnetic field due to stray fields from integrated micromagnets in hybrid nanowire quantum dots
• Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers
• Percolative supercurrent in superconductor-ferromagnetic insulator bilayers
• Odd-frequency Pairing in Josephson Junctions Coupled by Magnetic Textures