Hybrid Double Quantum Dots: Normal, Superconducting, and Topological Regimes

Abstract

Epitaxial semiconductor-superconductor hybrid materials are an excellent basis for studying mesoscopic and topological superconductivity, as the semiconductor inherits a hard superconducting gap while retaining tunable carrier density. Here, we investigate double-quantum-dot devices made from InAs nanowires with a patterned epitaxial Al two-facet shell that proximitizes two gate-defined segments along the nanowire. We follow the evolution of mesoscopic superconductivity and charging energy in this system as a function of magnetic field and voltage-tuned barriers. Inter-dot coupling is varied from strong to weak using side gates, and the ground state is varied between normal, superconducting, and topological regimes by applying a magnetic field. We identify the topological transition by tracking the spacing between successive cotunneling peaks as a function of axial magnetic field and show that the individual dots host weakly hybridized Majorana modes.

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• Yu-Shiba-Rusinov screening of spins in double quantum dots
• Shadow epitaxy for in-situ growth of generic semiconductor/superconductor devices
• Decays of Majorana or Andreev oscillations induced by steplike spin-orbit coupling
• Spin-resolved thermal signatures of Majorana-Kondo interplay in double quantum dots
• Topological supercurrents interaction and fluctuations in the multiterminal Josephson effect
• Partially-separated Majorana modes in a disordered medium
• Recent progress on Majorana in semiconductor-superconductor heterostructures--Engineering and detection
• Observation of 2e-periodic Supercurrents in Nanowire Single-Cooper-Pair Transistors
• Overlapping Andreev states in semiconducting nanowires: competition of 1D and 3D propagation
• Enhancement of the thermoelectric effect due to the Majorana zero modes coupled to one quantum-dot system
• Radio-frequency methods for Majorana-based quantum devices: fast charge sensing and phase diagram mapping
• $AbInitio$ Simulation of Non-Abelian Braiding Statistics in Topological Superconductors
• Kondo physics in double quantum dot based Cooper pair splitters
• Quantum transport through a quantum dot side-coupled to a Majorana bound state pair in the presence of electron-phonon interaction
• Multichannel charge Kondo effect and non-Fermi liquid fixed points in conventional and topological superconductor islands
• Transient effects in double quantum dot sandwiched laterally between superconducting and metallic leads
• Heat dissipation mechanisms in hybrid superconductor-semiconductor devices revealed by Joule spectroscopy
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• Concomitant opening of a topological bulk-gap with an emerging Majorana edge-state
• Quantum Criticality in Resonant Andreev Conduction
• Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
• Dephasing of Majorana qubits due to quasistatic disorder
• Second Order Perturbation Theory for a Superconducting Double Quantum Dot
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• Autler-Townes Doublet observation via a Cooper-Pair Beam Splitter
• Majorana polarization in disordered heterostructures
• Giant superconducting proximity effect on spintronic anisotropy
• Majorana modes in graphene strips: polarization, wavefunctions, disorder, and Andreev states
• Transient triplet blockade in Andreev junction
• Electronic transport in double-nanowire superconducting islands with multiple terminals