Current-phase relations of InAs nanowire Josephson junctions:From interacting to multimode regimes
| Autor: | Kathryn A. Moler, Roman M. Lutchyn, Gerbold Menard, Mingtang Deng, Peter Krogstrup, Zheng Cui, Charles Marcus, Andrey E. Antipov, Sean Hart |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Josephson effect
Superconductivity Physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Condensed Matter - Superconductivity Anharmonicity Nanowire FOS: Physical sciences 02 engineering and technology Electronic structure Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences 3. Good health Superconductivity (cond-mat.supr-con) MAJORANA Quantum dot Condensed Matter::Superconductivity Qubit Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics 0210 nano-technology |
| Zdroj: | Hart, S, Cui, Z, Menard, G, Deng, M, Antipov, A E, Lutchyn, R M, Krogstrup, P, Marcus, C M & Moler, K A 2019, ' Current-phase relations of InAs nanowire Josephson junctions : From interacting to multimode regimes ', Physical Review B, vol. 100, no. 6, 064523 . https://doi.org/10.1103/PhysRevB.100.064523 Physical Review B |
| DOI: | 10.1103/PhysRevB.100.064523 |
| Popis: | Gate-tunable semiconductor-superconductor nanowires with superconducting leads form exotic Josephson junctions that are a highly desirable platform for two types of qubits: those with topological superconductivity (Majorana qubits) and those based on tunable anharmonicity (gatemon qubits). Controlling their behavior, however, requires understanding their electrostatic environment and electronic structure. Here we study gated InAs nanowires with epitaxial aluminum shells. By measuring current-phase relations (CPR) and comparing them with analytical and numerical calculations, we show that we can tune the number of modes, determine the transparency of each mode, and tune into regimes in which electron-electron interactions are apparent, indicating the presence of a quantum dot. To take into account electrostatic and geometrical effects, we perform microscopic self-consistent Schrodinger-Poisson numerical simulations, revealing the energy spectrum of Andreev states in the junction as well as their spatial distribution. Our work systematically demonstrates the effect of device geometry, gate voltage and phase bias on mode behavior, providing new insights into ongoing experimental efforts and predictive device design. Comment: Main: 16 pages, 4 figures. Supplement: 8 pages, 4 figures |
| Databáze: | OpenAIRE |
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