An InAsSb surface quantum well with in-situ deposited Nb as a platform for semiconductor-superconductor hybrid devices

• URL: http://arxiv.org/abs/2510.00711v1
• Date: Wed, 01 Oct 2025 09:42:21 GMT
• Title: An InAsSb surface quantum well with in-situ deposited Nb as a platform for semiconductor-superconductor hybrid devices
• Authors: Sjoerd Telkamp, Zijin Lei, Tommaso Antonelli, Christian Reichl, Ilya Besedin, Georg Jakobs, Stefan Fält, Christian Marty, Rüdiger Schott, Werner Wegscheider,
• Abstract summary: We present a novel semiconductor-superconductor hybrid material based on a molecular beam epitaxially grown InAsSb surface quantum well with an in-situ deposited Nb top layer.<n>The in-situ deposition of the Nb results in a high-quality interface that enables strong coupling to the InAsSb quantum well.<n>The large induced superconducting gap combined with strong spin-orbit interaction position this material as an attractive platform for experiments exploring gate-tunable superconductivity and topological superconducting devices.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a novel semiconductor-superconductor hybrid material based on a molecular beam epitaxially grown InAsSb surface quantum well with an in-situ deposited Nb top layer. Relative to conventional Al-InAs based systems, the InAsSb surface quantum well offers a lower effective mass and stronger spin-orbit interaction, while the Nb layer has a higher critical temperature and a larger critical magnetic field. The in-situ deposition of the Nb results in a high-quality interface that enables strong coupling to the InAsSb quantum well. Transport measurements on Josephson junctions reveal an induced superconducting gap of 1.3 meV. Furthermore, a planar asymmetric SQUID is realized, exhibiting gate-tunable superimposed oscillations originating from both the individual Josephson junction and the full SQUID loop. The large induced superconducting gap combined with strong spin-orbit interaction position this material as an attractive platform for experiments exploring gate-tunable superconductivity and topological superconducting devices.

Related papers

• High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry [0.731365367571807]
  We report high-field magneto transport measurements up to 41 Tesla of AHTS across the entire superconducting dome.<n>The measured superconducting coherence length demonstrates that atomic-scale engineering controls not only the critical temperature but also the intrinsic pair size at Fano-Feshbach resonances physics.
  arXiv  Detail & Related papers  (2025-12-12T11:42:35Z)
• Enhanced and modulable induced superconducting gap and effective Landé g-factor in Pb-InSb hybrid devices [19.425902886527076]
  We show lead (Pb)-based hybrid quantum devices exhibit a remarkably large and hard proximity-induced superconducting gap.<n>These findings underscore the superior functionality of Pb-based hybrid systems.
  arXiv  Detail & Related papers  (2025-06-04T04:27:57Z)
• Crystalline superconductor-semiconductor Josephson junctions for compact superconducting qubits [0.5579360860559355]
  We study vertically stacked van der Waals Josephson junctions with semiconducting weak links, whose crystalline structures and clean interfaces offer a promising platform for quantum devices.<n>We fabricate a prototype all-crystalline merged-element transmon qubit with transmon frequency and anharmonicity closely matching design parameters.<n>We demonstrate dispersive coupling between this transmon and a microwave resonator, highlighting the potential of crystalline superconductor-semiconductor structures for compact, tailored superconducting quantum devices.
  arXiv  Detail & Related papers  (2025-01-24T23:08:13Z)
• Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
  We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
  arXiv  Detail & Related papers  (2024-10-18T22:25:50Z)
• Superconductivity induced by strong electron-exciton coupling in doped atomically thin semiconductor heterostructures [2.774762581379568]
  We study a mechanism to induce superconductivity in atomically thin semiconductors. By accounting for the strong-coupling physics of trions, we find that the effective electron-exciton interaction develops a strong frequency and momentum dependence.
  arXiv  Detail & Related papers  (2023-10-16T18:00:03Z)
• Gate-tunable Superconductivity in Hybrid InSb-Pb Nanowires [3.8949119001393333]
  We present a report on hybrid InSb-Pb nanowires that combine high spin-orbit coupling with a high critical field and a large superconducting gap. Hard induced superconducting gaps and gate-tunable supercurrent are observed in the hybrid nanowires.
  arXiv  Detail & Related papers  (2023-09-15T17:40:32Z)
• Fragmented superconductivity in the Hubbard model as solitons in Ginzburg-Landau theory [39.58317527488534]
  Superconductivity and charge density waves are observed in close vicinity in strongly correlated materials. We investigate the nature of such an intertwined state of matter stabilized in the phase diagram of the elementary $t$-$tprime$-$U$ Hubbard model. We provide conclusive evidence that the macroscopic wave functions of the superconducting fragments are well-described by soliton solutions of a Ginzburg-Landau equation.
  arXiv  Detail & Related papers  (2023-07-21T18:00:07Z)
• Negative electrohydrostatic pressure between superconducting bodies [39.58317527488534]
  We predict a negative (attractive) pressure between planar superconducting bodies. The resulting surface energies are in better agreement than those predicted by the Hartree-Fock theory. The model circumvents the bulk limitations of the Bardeen-Cooper-Schrieffer and Ginzburg-Landau theories.
  arXiv  Detail & Related papers  (2023-07-10T21:08:22Z)
• Ternary Metal Oxide Substrates for Superconducting Circuits [65.60958948226929]
  Substrate material imperfections and surface losses are one of the major factors limiting superconducting quantum circuitry from reaching the scale and complexity required to build a practicable quantum computer. Here, we examine two ternary metal oxide materials, spinel (MgAl2O4) and lanthanum aluminate (LaAlO3), with a focus on surface and interface characterization and preparation.
  arXiv  Detail & Related papers  (2022-01-17T06:10:15Z)
• TOF-SIMS Analysis of Decoherence Sources in Nb Superconducting Resonators [48.7576911714538]
  Superconducting qubits have emerged as a potentially foundational platform technology. Material quality and interfacial structures continue to curb device performance. Two-level system defects in the thin film and adjacent regions introduce noise and dissipate electromagnetic energy.
  arXiv  Detail & Related papers  (2021-08-30T22:22:47Z)
• Discovery of Nb hydride precipitates in superconducting qubits [37.69303106863453]
  We report the first evidence of the formation of niobium hydrides within niobium films on silicon in superconducting qubits fabricated at Rigetti Computing. High-resolution transmission electron microscopy (HRTEM) analyses are performed at room and cryogenic temperatures (106 K) on superconducting qubit niobium film areas. Our findings highlight a new previously unknown source of decoherence in superconducting qubits, contributing to both quasi and two-level system (TLS) losses.
  arXiv  Detail & Related papers  (2021-08-23T20:01:38Z)
• Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
  tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits. We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
  arXiv  Detail & Related papers  (2020-11-29T09:57:50Z)
• Tunable quantum photonics platform based on fiber-cavity enhanced single photon emission from two-dimensional hBN [52.915502553459724]
  In this work we present a hybrid system consisting of defect centers in few-layer hBN grown by chemical vapor deposition and a fiber-based Fabry-Perot cavity. We achieve very large cavity-assisted signal enhancement up to 50-fold and equally strong linewidth narrowing owing to cavity funneling. Our work marks an important milestone for the deployment of 2D materials coupled to fiber-based cavities in practical quantum technologies.
  arXiv  Detail & Related papers  (2020-06-23T14:20:46Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.