Full parity phase diagram of a proximitized nanowire island

Shen, Jie; Winkler, Georg; Borsoi, Francesco; Heedt, Sebastian; Levajac, Vukan; Wang, J.-Y.; Driel, David van; Bouman, Daniël; Gazibegović, Saša; Veld, Roy L. M. Op het; Car, Diana; Logan, J. A.; Pendharkar, Mihir; Palmstrøm, C. J.; Bakkers, Erik P. A. M.; Kouwenhoven, Leo P.; Heck, Bernard van

doi:10.1103/physrevb.104.045422

Cited by 30 publications

(33 citation statements)

References 50 publications

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“…We note that at higher temperature, the onset of gate leakage shifts down to 5 V causing an increase in the fit uncertainty and interrupting the monotonous decrease of the gap with gate voltage. Moreover, we observe two distinct slopes: a shallow slope between −10 V and −2 V and a steeper slope between −2 V and 5 V. Similar observations have also been made in previous experiments on similar devices [30][31][32][33]50]. We attribute the first regime to the strong hybridization of the InAs sub-bands with Al, and the second to an increase in the density in InAs with the occupation of new sub-bands.…”

supporting

confidence: 89%

Gate-tunable kinetic inductance in proximitized nanowires

Splitthoff,

Bargerbos,

Grünhaupt

et al. 2022

Preprint

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We report the detection of a gate-tunable kinetic inductance in a hybrid InAs/Al nanowire. For this purpose, we have embedded the nanowire into a quarter-wave coplanar waveguide resonator and measured the resonance frequency of the circuit. We find that the resonance frequency can be changed via the gate voltage that controls the electron density of the proximitized semiconductor and thus the nanowire inductance. Applying Mattis-Bardeen theory, we extract the gate dependence of the normal state conductivity of the nanowire, as well as its superconducting gap. Our measurements complement existing characterization methods for hybrid nanowires and provide a new and useful tool for gate-controlled superconducting electronics.

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supporting

confidence: 89%

Gate-tunable kinetic inductance in proximitized nanowires

Splitthoff,

Bargerbos,

Grünhaupt

et al. 2022

Preprint

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“…Under this condition, the measured differential conductance reflects the quasiparticle density of states (DOS) in the proximitized section of the nanowire. Here, the super gate voltage is set to V SG = -1 V, where a strong coupling between the nanowire and the superconducting shell is expected (10,34). The differential conductance is shown as a function of magnetic field parallel to the nanowire axis in Fig.…”

Section: Spectroscopy and Coulomb Blockade Of Insb/al/pt Hybridsmentioning

confidence: 99%

“…The super gate voltage V SG controls the chemical potential in the hybrid, and the tunnel gate voltages, V TL and V TR , are used to control the left and right junction conductances, respectively. In this work, we fix the super gate voltage to be V SG = -2 V, where the nanowire is expected to be strongly coupled to the superconducting shell (10,34). Bias voltages are applied to the left (V L ) or right (V R ) normal contact while keeping the middle lead grounded.…”

Section: Non-local Measurements Of Three-terminal Hybridsmentioning

confidence: 99%

Spin-mixing enhanced proximity effect in aluminum-based superconductor-semiconductor hybrids

Mazur¹,

Loo²,

Wang³

et al. 2022

Preprint

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The two-electron charging effect, a fundamental requirement for topological quantum computation, is shown to be robust against the presence of heavy adatoms. Additionally, we use non-local spectroscopy in a three-terminal geometry to probe the bulk of hybrid devices, showing that it remains free of sub-gap states. Finally, we demonstrate that semiconductor states which are proximitized by Al/Pt films maintain their ability to Zeeman-split in an applied magnetic field. Combined with the chemical stability and well-known fabrication routes of aluminum, Al/Pt emerges as the natural successor to Al-based systems and is a compelling alternative to other superconductors, whenever high-field resilience is required.

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“…In addition, this non-local feature is directly associated with the topological protection of the potential Majorana-based quantum information processing. This fact has inspired multiple recent theoretical [33][34][35][36][37][38][39][40] proposals and experimental [41][42][43][44][45][46][47][48][49][50] efforts.…”

mentioning

confidence: 99%

Double Fu-teleportation and anomalous Coulomb blockade in a Majorana-hosted superconducting island

Hao¹,

Z²,

Liu³

et al. 2022

Preprint

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We study the temperature dependence of Coulomb Blockade peak conductance based on a Majorana-hosted superconducting island. In the low-temperature regime, we discover a coherent double Fu-teleportation (FT) process, where any independent tunneling process always involves two coherent FTs; and we also find an anomalous universal scaling behavior, which shows a crossover from a [max(T, eV )] 6 to a [max(T, eV )] 3 conductance behavior as increasing energy scale. In the high-temperature regime, using the familiar rate equation method, we find that the conductance is proportional to the reciprocal of the temperature and shows a nonmonotonic temperature-dependence. Both the anomalous power-law behavior and non-monotonic temperaturedependence can be distinguished from the conductance peak in the traditional Coulomb block, and therefore, serve as a hallmark for the non-local transport in the topological superconducting island.

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Full parity phase diagram of a proximitized nanowire island

Cited by 30 publications

References 50 publications

Gate-tunable kinetic inductance in proximitized nanowires

Gate-tunable kinetic inductance in proximitized nanowires

Spin-mixing enhanced proximity effect in aluminum-based superconductor-semiconductor hybrids

Double Fu-teleportation and anomalous Coulomb blockade in a Majorana-hosted superconducting island

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