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Magnetic texture modulated superconductivity in superconductor/ferromagnet shells of semiconductor nanowires
Nabhanila Nandi, Juan Carlos Estrada Saldaña, Alexandros Vekris +11
In a one-dimensional ferromagnet-superconductor nanowire, magnetism can suppress superconductivity except where the Zeeman field is suppressed, for example domain wall superconduct…
Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers
J. Zhao, A. Mazanik, D. Razmadze +4
We report transport studies of hybrid Josephson junctions based on semiconducting InAs nanowires with fully overlapping epitaxial ferromagnetic insulator EuS and superconducting Al…
Subgap transport in superconductor--semiconductor hybrid islands: Weak and strong coupling regimes
Marco Valentini, Rubén Seoane Souto, Maksim Borovkov +5
Superconductor--semiconductor hybrid systems play a crucial role in realizing nanoscale quantum devices, including hybrid qubits, Majorana bound states, and Kitaev chains. For such…
Ground state phase diagram and "parity flipping'' microwave transitions in a gate-tunable Josephson Junction
M. R. Sahu, F. J. Matute-Cañadas, M. Benito +6
We probed a gate-tunable InAs nanowire Josephson weak link by coupling it to a microwave resonator. Tracking the resonator frequency shift when the weak link is close to pinch-off,…
Gate-tunable Superconductivity in Hybrid InSb-Pb Nanowires
Yan Chen, David van Driel, Charalampos Lampadaris +7
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. Material characterization indicate…
Supercurrent transport through 1-periodic full-shell Coulomb islands
D. Razmadze, R. Seoane Souto, E. C. T. O'Farrell +4
We experimentally investigate supercurrent through Coulomb islands, where island and leads are fabricated from semiconducting nanowires with fully surrounding superconducting shell…
InAs/MoRe hybrid semiconductor/superconductor nanowire devices
Bilal Kousar, Damon J. Carrad, Lukas Stampfer +3
Implementing superconductors capable of proximity-inducing a large energy-gap in semiconductors in the presence of strong magnetic fields is a major goal towards applications of se…
Quantum capacitance of a superconducting subgap state in an electrostatically floating dot-island
Filip K. Malinowski, R. K. Rupesh, Luka Pavešić +10
We study a hybrid device defined in an InAs nanowire with an epitaxial Al shell that consists of a quantum dot in contact with a superconducting island. The device is electrically…
Few-mode to mesoscopic junctions in gatemon qubits
Alisa Danilenko, Deividas Sabonis, Georg W. Winkler +3
We investigate a semiconductor nanowire-based gatemon qubit with epitaxial Al on two facets of the nanowire, allowing gate control of wire density. Two segments have the Al removed…
Microwave spectroscopy of interacting Andreev spins
J. J. Wesdorp, F. J. Matute-Caňadas, A. Vaartjes +13
Andreev bound states are fermionic states localized in weak links between superconductors which can be occupied with spinful quasiparticles. Microwave experiments using superconduc…
InAs-Al Hybrid Devices Passing the Topological Gap Protocol
Morteza Aghaee, Arun Akkala, Zulfi Alam +124
We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majora…
Photon assisted tunneling of high order multiple Andreev reflections in epitaxial nanowire Josephson junctions
Damon J. Carrad, Lukas Stampfer, Dags Olsteins +4
Semiconductor/superconductor hybrids exhibit a range of phenomena that can be exploited for the study of novel physics and the development of new technologies. Understanding the or…
Parity switching in a full-shell superconductor-semiconductor nanowire qubit
O. Erlandsson, D. Sabonis, A. Kringhøj +4
The rate of charge-parity switching in a full-shell superconductor-semiconductor nanowire qubit is measured by directly monitoring the dispersive shift of a readout resonator. At z…
Electrostatic control of quasiparticle poisoning in a hybrid semiconductor-superconductor island
H. Q. Nguyen, D. Sabonis, D. Razmadze +8
The performance of superconducting devices is often degraded by the uncontrolled appearance and disappearance of quasiparticles, a process known as poisoning. We demonstrate electr…
Microwave susceptibility observation of interacting many-body Andreev states
V. Fatemi, P. D. Kurilovich, M. Hays +10
Electrostatic charging affects the many-body spectrum of Andreev states, yet its influence on their microwave properties has not been elucidated. We developed a circuit quantum ele…
Dynamical polarization of the fermion parity in a nanowire Josephson junction
J. J. Wesdorp, L. Grünhaupt, A. Vaartjes +6
Josephson junctions in InAs nanowires proximitized with an Al shell can host gate-tunable Andreev bound states. Depending on the bound state occupation, the fermion parity of the j…
Signatures of interactions in the Andreev spectrum of nanowire Josephson junctions
F. J. Matute-Cañadas, C. Metzger, Sunghun Park +7
We performed microwave spectroscopy of an InAs nanowire between superconducting contacts implementing a finite-length, multi-channel Josephson weak link. Certain features in the sp…
Radio-frequency C-V measurements with sub-attofarad sensitivity
Filip K. Malinowski, Lin Han, Damaz de Jong +9
We demonstrate the use of radio-frequency (rf) resonators to measure the capacitance of nano-scale semiconducting devices in field-effect transistor configurations. The rf resonato…
Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit
Willemijn Uilhoorn, James G. Kroll, Arno Bargerbos +6
The tunneling of quasiparticles (QPs) across Josephson junctions (JJs) detrimentally affects the coherence of superconducting and charge-parity qubits, and is shown to occur more f…
Comparing tunneling spectroscopy and charge sensing of Andreev bound states in a semiconductor-superconductor hybrid nanowire structure
Deividas Sabonis, David van Zanten, Judith Suter +7
Transport studies of Andreev bound states (ABSs) are complicated by the interplay of charging effects and superconductivity. Here, we compare transport approaches to ABS spectrosco…
Direct Transport between Superconducting Subgap States in a Double Quantum Dot
Gorm Ole Steffensen, Juan Carlos Estrada Saldaña, Alexandros Vekris +5
We demonstrate direct transport between two opposing sets of Yu-Shiba-Rusinov (YSR) subgap states realized in a double quantum dot. This sub-gap transport relies on intrinsic quasi…
Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic insulator islands
S. Vaitiekėnas, R. Seoane Souto, Y. Liu +4
We report Coulomb blockade transport studies of semiconducting InAs nanowires grown with epitaxial superconducting Al and ferromagnetic insulator EuS on overlapping facets. Compari…
Andreev interference in the surface accumulation layer of half-shell InAsSb/Al hybrid nanowires
Lukas Stampfer, Damon J. Carrad, Dags Olsteins +4
Understanding the spatial distribution of charge carriers in III-V nanowires proximity coupled to superconductors is important for the design and interpretation of experiments base…
Rapid microwave-only characterization and readout of quantum dots using multiplexed gigahertz-frequency resonators
Damaz de Jong, Christian Prosko, Daan M. A. Waardenburg +6
Superconducting resonators enable fast characterization and readout of mesoscopic quantum devices. Finding ways to perform measurements of interest on such devices using resonators…