Tunable Supercurrent Through Semiconductor Nanowires

Doh, Yong-Joo; Dam, Jorden A. van; Roest, Aarnoud L.; Bakkers, Erik P. A. M.; Kouwenhoven, Leo P.; Franceschi, S. De

doi:10.1126/science.1113523

Cited by 491 publications

(584 citation statements)

References 28 publications

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“…Josephson junctions and coherent quantum transport have been attracting interest in recent years due to the development of modern nanofabrication techniques, which enable the fabrication of nanoscale hybrid superconducting devices in a broad range of design and materials. Josephson junctions realized with semiconductor nanowires (NWs) [4][5][6][7][8][9][10] have shown a high potential in different types of nanoscale devices demonstrating, for example, tunable supercurrents [5,6], the supercurrent reversal [8], and the suppression of supercurrent by hot electron injection [10]. NWs have also been used for superconducting quantum interference devices (SQUIDs) [8] and tunable Cooper pair splitters [11].…”

Section: Introductionmentioning

confidence: 99%

Pb/InAs Nanowire Josephson Junction with High Critical Current and Magnetic Flux Focusing

et al. 2015

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We have studied mesoscopic Josephson junctions formed by highly n-doped InAs nanowires and superconducting Ti/Pb source and drain leads. The current-voltage properties of the system are investigated by varying temperature and external out-of-plane magnetic field. Superconductivity in the Pb electrodes persists up to ∼ 7 K and with magnetic field values up to 0.4 T. Josephson coupling at zero backgate voltage is observed up to 4.5 K and the critical current is measured to be as high as 615 nA. The supercurrent suppression as a function of the magnetic field reveals a diffraction pattern that is explained by a strong magnetic flux focusing provided by the superconducting electrodes forming the junction.

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Section: Introductionmentioning

confidence: 99%

Pb/InAs Nanowire Josephson Junction with High Critical Current and Magnetic Flux Focusing

et al. 2015

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“…Recent developments in techniques for fabrication of quantum dot systems have made it possible to produce S-QD-S systems [3][4][5][6][7] enabling experimental studies of this intriguing interplay. In carbon nanotubes [3], it was found that the Kondo state persists when the energy needed for breaking the Cooper pairs is compensated by the energy gained in forming the Kondo state (T K > ).…”

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confidence: 99%

Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots

et al. 2007

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We report measurements of the nonlinear conductance of InAs nanowire quantum dots coupled to superconducting leads. We observe a clear alternation between odd and even occupation of the dot, with sub-gap-peaks at $|V_{sd}|=\Delta/e$ markedly stronger(weaker) than the quasiparticle tunneling peaks at $|V_{sd}|=2\Delta/e$ for odd(even) occupation. We attribute the enhanced $\Delta$-peak to an interplay between Kondo-correlations and Andreev tunneling in dots with an odd number of spins, and substantiate this interpretation by a poor man's scaling analysis

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“…Th ey also rapidly exclude materials forming near the growing walls, terminating propagation through the crystal. Th e LED, which is a forward-biased junction of a p-type (hole-transporting) and n-type (electron-transporting) material, can be downsized by the use of 1D NWs and also benefi t, in effi ciency, from the superior electronic [2][3][4] and thermal [5] transport properties compared with their bulk counterparts. One of the challenges is doping the NWs, and the other is, of course, achieving a good electrical p-n junction.…”

Section: Solid-state Lighting and Ledsmentioning

confidence: 99%

Energy production and conversion applications of one-dimensional semiconductor nanostructures

Chattopadhyay¹,

Chen

2011

NPG Asia Mater

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W ith the projected world demand for energy reaching 612 quadrillion Btu (~649×10 18 J or 33 GW-yrs) in 2020 and the associated problem of carbon emission, it has become necessary to look for every enabling technology that may assist in reaching that goal in a sustainable way. Th is daunting task can broadly be classifi ed into two areas of research. Th e fi rst area includes enhancing the effi ciencies of existing 'power-consuming' technologies as well as energy generation and conversion. For example, the use of light-emitting diodes (LEDs) may push external effi ciencies up to 50%, against 13% for conventional technologies such as fl uorescent lamps. Th e use of sustainable energy generation by solar photovoltaics not only contributes to energy supply but also controls carbon emission. Th e second area includes efficient energy-storage systems, such as fuel cells and lithium batteries, for the portable electronic devices that continue to percolated throughout human society.Th e advent of nanoscience has shed light on almost every fi eld of science and technology, particularly in the development of renewable energies. Among the vast varieties of nanomaterials that have been developed, onedimensional (1D) nanomaterials with their inherent large specifi c surface areas and continuous transport path for charge carriers are useful for energy harvesting and conversion applications, which are mostly associated with surface reaction and carrier transport. When the diameter of a material is reduced below a critical value, the additional advantage of 1D materials, such as surface band bending-enhanced photoconductivity or even ballistic transport, may appear, which further enhances their carrier transport properties and hence energy conversion effi ciency. Extensive investigations have been made in this direction aiming to enhance the effi ciency of energy conversion and harvesting while lowering the cost of the aforementioned devices. In this review, selected 1D nanomaterials and their applications in energy conversion and generation technologies such as photonics, photovoltaics, photocatalysis and fuel cells will be covered. Solid-state lighting and LEDsIncreased technology effi ciency will eventually lower the demand for energy. For example, approximately 20% of world energy demand is for lighting purposes, which can be reduced through the effi cient use of LEDs instead of the fl uorescent, incandescent or high-pressure discharge lamps commonly used today. Group III nitride materials such as AlN, GaN and InN dominate in the fi eld of LEDs. However, ternary and quaternary compounds arising out of a mix of these, for example Al x Ga 1-x N and In x Ga 1-x N, can have their bandgaps, and hence emission, tuned from deep ultraviolet (UV) to the infrared by adjusting the composition fraction x [1]. Th ese materials are hard to grow due to the scarcity of lattice-matched substrates, which has led to defects in the crystal that deteriorate the device's optoelectronic properties. One-dimensional nanowires (NWs), on the other h...

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Tunable Supercurrent Through Semiconductor Nanowires

Cited by 491 publications

References 28 publications

Pb/InAs Nanowire Josephson Junction with High Critical Current and Magnetic Flux Focusing

Pb/InAs Nanowire Josephson Junction with High Critical Current and Magnetic Flux Focusing

Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots

Energy production and conversion applications of one-dimensional semiconductor nanostructures

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