Phase-tunable multiple Andreev reflections in a quantum spin Hall strip
arXiv:2301.09114 · doi:10.1088/1361-6668/ace2f0
Abstract
A quantum spin Hall strip where different edges are contacted by -wave superconductors with a phase difference supports Majorana bound states protected by time-reversal symmetry. We study signatures of these states in a four-terminal setup where two Josephson junctions are built on opposite edges of the strip and the phase difference between superconductors can be controlled by an external flux. Applying a voltage bias across the quantum spin Hall strip results in a sequence of conductance peaks from multiple Andreev reflections. We find that this so-called subharmonic gap structure is very sensitive to the phase difference and displays a phase-controlled even-odd effect, where all odd spikes disappear when the Majorana states are formed for . Moreover, the remaining even spikes split when the superconductors forming the junction have different gap size. We explain these features by showing that any midgap bound states enhance the transmission of the even order multiple Andreev reflections, while the reduced density of states at the gap edges suppresses the odd order ones.
arXiv comment9 pages, 5 figures
References in corpus (60)
- Topological Insulators
- Topological insulators and superconductors
- Quantum Spin Hall Effect in Graphene
- Fault-tolerant quantum computation by anyons
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Non-Abelian Anyons and Topological Quantum Computation
- Topological Order and the Quantum Spin Hall Effect
- Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
- Unpaired Majorana fermions in quantum wires
- Topological Insulator Materials
- Non-Abelian statistics and topological quantum information processing in 1D wire networks
- Josephson Current and Noise at a Superconductor-Quantum Spin Hall Insulator-Superconductor Junction
- Nonlocal edge state transport in the quantum spin Hall state
- Majorana Fermion Induced Resonant Andreev Reflection
- Introduction to topological superconductivity and Majorana fermions
- Quantum Spin Hall Effect in Inverted Type II Semiconductors
- The Helical Liquid and the Edge of Quantum Spin Hall Systems
- Electrically detected interferometry of Majorana fermions in a topological insulator
- Stability of the quantum spin Hall effect: effects of interactions, disorder, and Z_2 topology
- Hamiltonian approach to the transport properties of superconducting quantum point contacts
- Manipulation of Majorana fermion, Andreev reflection and Josephson current on topological insulators
- Tunneling characteristic of a chain of Majorana bound states
- AC JOSEPHSON EFFECT IN A SINGLE QUANTUM CHANNEL
- Evidence of topological superconductivity in planar Josephson junctions
- Induced Superconductivity in the Quantum Spin Hall Edge
- Fractional ac Josephson effect in p- and d-wave superconductors
- Topological Superconductivity in a Phase-Controlled Josephson Junction
- Spin polarization of the quantum spin Hall edge states
- Observing Majorana Bound States in p-wave Superconductors Using Noise Measurements in Tunneling Experiments
- Gapless Andreev bound states in the quantum spin Hall insulator HgTe
- Midgap edge states and pairing symmetry of quasi-one-dimensional organic superconductors
- Time Reversal Invariant Topological Superconductivity and Majorana Kramers Pairs
- Edge-mode Superconductivity in a Two Dimensional Topological Insulator
- Inducing time reversal invariant topological superconductivity and fermion parity pumping in quantum wires
- Non-equilibrium Josephson effect through helical edge states
- Low-energy theory of transport in Majorana wire junctions
- Multiple Andreev reflection and critical current in topological superconducting nanowire junctions
- Spin-helical transport in normal and superconducting topological insulators
- Odd-Frequency Triplet Superconductivity at the Helical Edge of a Toplogical Insulator
- Conductance signatures of odd-frequency superconductivity in quantum spin Hall systems using a quantum point contact
- Detection of Majorana Kramers pairs using a quantum point contact
- Tunable hybridization of Majorana bound states at the quantum spin Hall edge
- Evidence for Majorana bound states in transport properties of hybrid structures based on helical liquids
- Helical Liquids in Semiconductors
- Quantization of Conductance Minimum and Index Theorem
- Anomalous Proximity Effect and Theoretical Design for its Realization
- Influence of the impurity scattering on charge transport in unconventional superconductor junctions
- Current fluctuations in unconventional superconductor junctions with impurity scattering
- Supercurrent carried by non-equlibrium quasiparticles in a multiterminal Josephson junction
- Transport in superconductor--normal metal--superconductor tunneling structures: Spinful p-wave and spin-orbit-coupled topological wires
- Phase-tunable electron transport assisted by odd-frequency Cooper pairs in topological Josephson junctions
- Manipulation of Cooper pair entanglement in hybrid topological Josephson junctions
- Phase dependent multiple Andreev reflections in SNS interferometers
- Andreev interferometer with three superconducting electrodes
- Signatures of Majorana Kramers pairs in superconductor-Luttinger liquid and superconductor-quantum dot-normal lead junctions
- Cross-correlations of coherent multiple Andreev reflections
- Spin-polarized multiple Andreev reflections in spin-split superconductors
- The invisible Majorana bound state at the helical edge
- Identifying Majorana bound states at quantum spin Hall edges using a metallic probe
- Multiple Andreev reflections in two-dimensional Josephson junctions with broken time-reversal symmetry