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Electronic structure of InAs and InSb surfaces: density functional theory and angle-resolved photoemission spectroscopy
Shuyang Yang, Niels B. M. Schröter, Sergej Schuwalow +10
The electronic structure of surfaces plays a key role in the properties of quantum devices. However, surfaces are also the most challenging to simulate and engineer. Here, we study…
Andreev Modes from Phase Winding in a Full-shell Nanowire-based Transmon
A. Kringhøj, G. W. Winkler, T. W. Larsen +6
We investigate transmon qubits made from semiconductor nanowires with a fully surrounding superconducting shell. In the regime of reentrant superconductivity associated with the de…
Triplet-blockaded Josephson supercurrent in double quantum dots
Daniël Bouman, Ruben J. J. van Gulik, Gorm Steffensen +7
Serial double quantum dots created in semiconductor nanostructures provide a versatile platform for investigating two-electron spin quantum states, which can be tuned by electrosta…
Nontopological zero-bias peaks in full-shell nanowires induced by flux tunable Andreev states
Marco Valentini, Fernando Peñaranda, Andrea Hofmann +7
A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstr…
Quantum-Dot Parity Effects in Trivial and Topological Josephson Junctions
D. Razmadze, E. C. T. O'Farrell, P. Krogstrup +1
An odd-occupied quantum dot in a Josephson junction can flip transmission phase, creating a π-junction. When the junction couples topological superconductors, no phase flip is expe…
Destructive Little-Parks Effect in a Full-Shell Nanowire-based Transmon
Deividas Sabonis, Oscar Erlandsson, Anders Kringhøj +6
A semiconductor transmon with an epitaxial Al shell fully surrounding an InAs nanowire core is investigated in the low regime. Little-Parks oscillations as a function of…
Au-Assisted Substrate-Faceting for Inclined Nanowire Growth
Jung-Hyun Kang, Filip Krizek, Magdalena Zaluska-Kotur +4
We study the role of gold droplets in the initial stage of nanowire growth via the vapor liquid solid method. Apart from serving as a collections center for growth species, the gol…
Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires
S. Vaitiekėnas, Y. Liu, P. Krogstrup +1
We report transport measurements and tunneling spectroscopy in hybrid nanowires with epitaxial layers of superconducting Al and the ferromagnetic insulator EuS, grown on semiconduc…
A Parity-Protected Superconductor-Semiconductor Qubit
T. W. Larsen, M. E. Gershenson, L. Casparis +7
Coherence of superconducting qubits can be improved by implementing designs that protect the parity of Cooper pairs on superconducting islands. Here, we introduce a parity-protecte…
Flux-induced topological superconductivity in full-shell nanowires
S. Vaitiekėnas, G. W. Winkler, B. van Heck +8
We present a novel route to realizing topological superconductivity using magnetic flux applied to a full superconducting shell surrounding a semiconducting nanowire core. In the d…
Transparent Gatable Superconducting Shadow Junctions
Sabbir A. Khan, Charalampos Lampadaris, Ajuan Cui +14
Gate tunable junctions are key elements in quantum devices based on hybrid semiconductor-superconductor materials. They serve multiple purposes ranging from tunnel spectroscopy pro…
Temperature Induced Shifts of Yu-Shiba-Rusinov Resonances in Nanowire-Based Hybrid Quantum Dots
Juan Carlos Estrada Saldaña, Alexandros Vekris, Victoria Sosnovtseva +4
The strong coupling of a superconductor to a spinful quantum dot results in Yu-Shiba-Rusinov (YSR) discrete subgap excitations. In isolation and at zero temperature, the excitation…