A Topological SQUIPT based on helical edge states in proximity to superconductors

Abstract

We propose a device based on a topological Josephson junction where the helical edge states of a two-dimensional topological insulator are in close proximity to two superconducting leads. The presence of a magnetic flux through the junction leads to a Doppler shift in the spectrum of Andreev bound states, and affects the quantum interference between proximized edge states. We inspect the emergent features, accessing the density of states through a tunnel-coupled metallic probe, thus realizing a Topological Superconducting Quantum Interference Proximity Transistor (TSQUIPT). We calculate the expected performances of this new device, concluding that it can be used as a sensitive, absolute magnetometer due to the voltage drop across the junction decaying to a constant value as a function of the magnetic flux. Contrary to conventional SQUID and SQUIPT designs, no ring structure is needed. The findings pave the way for novel and sensitive devices based on hybrid devices that exploit helical edge states.

8 pages, 7 figures

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Cited by in corpus (13)

• Nonlocal Thermoelectricity in a S-TI-S Junction in Contact with a N-Metal Probe: Evidence for Helical Edge States
• Synthetic Weyl Points and Chiral Anomaly in Majorana Devices with Nonstandard Andreev-Bound-State Spectra
• Coherent Josephson thermodynamic cycles
• Nonlocal thermoelectricity in a topological Andreev interferometer
• Phase-tunable thermal rectification in the topological SQUIPT
• Phase-coherent caloritronics with ordinary and topological Josephson junctions
• Magnetoelectrically-Tunable Andreev-Bound-State Spectra and Spin Polarization in P-Wave Josephson Junctions
• Nonlocal thermoelectric engines in hybrid topological Josephson junctions
• Levitons in helical liquids with Rashba spin-orbit coupling probed by a superconducting contact
• Signatures of Jackiw-Rebbi resonance in the thermal conductance of topological Josephson junctions with magnetic islands
• Trapping Majorana Zero Modes in Vortices of Magnetic Texture Crystals Coupled to Nodal Superconductors
• Identifying Majorana bound states at quantum spin Hall edges using a metallic probe
• Anomalous flux periodicity in proximitised quantum spin Hall constrictions