Flux-periodic resistance oscillations in arrays of superconducting weak links based on InAs-AlSb quantum wells with Nb electrodes

Thomas, M.; Blank, H.-R.; Wong, K. C.; Nguyen, C.; Kroemer, H.; Hu, Evelyn L.

doi:10.1103/physrevb.54.r2311

Cited by 7 publications

(16 citation statements)

References 10 publications

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“…11 During that study, a sample with an initial width of 98µm was etched down, first to a width of 44µm, then to 16 µm. The devices showed the expected dependence of flux quantization effects on width, but also an unexpected decrease in the apparent activation energies of their zerobias resistance.…”

Section: Width Dependence a Experimental Resultsmentioning

confidence: 99%

“…These observations are strongly supported by some of our own work, which falls into a similar parameter range, although we did not stress the relative magnitudes of electrode separation and coherence length. [4][5][6][11][12][13][14][15] On the theoretical side, the work most relevant to the devices of interest here is probably that by Kümmel, Gunsenheimer, Nicolsky, Zaikin, et al (KGNZ), [25][26][27] (where additional references to earlier work can be found). These authors studied the operation of weak links in the ballistic limit, emphasizing the central role of multiple Andreev reflections in such devices.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Much of that interest was stimulated by the 1978/1980 papers of Silver et al 17 and Clark et al, 18 who proposed three-terminal gate-modulatable weak-link devices, referred to as hybrid Josephson field effect transistors, or briefly JOFETs. These devices draw on the ability to modulate the electron concentration in a thin semiconductor layer via a gate electrode, and thereby modulate the Josephson critical current.…”

Section: Introductionmentioning

confidence: 99%

“…For device applications, working with larger separations offers Series arrays used for studying the low-bias resistance of the weak links, made by molecular beam epitaxy and laser holography. 6,11 The top shows a crosssection through a pair of Nb lines separated by a narrow stripe of InAs-AlSb quantum well, the bottom shows the overall layout. All I-V measurements are four-point measurements, made by imposing a current I via the outer contacts and measuring the voltage V between the inner contacts.…”

Section: Introductionmentioning

confidence: 99%

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Current-voltage characteristics of semiconductor-coupled superconducting weak links with large electrode separations

et al. 1998

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We have studied the current-voltage characteristics of superconducting weak links in which the coupling medium is the 2-D electron gas in InAs-based semiconductor quantum wells, with relatively large (typically 0.5µm) separations between niobium electrodes. The devices exhibit Josephson-like current-voltage characteristics; however, the falloff of the differential resistance with decreasing temperature is thermally activated, and is orders of magnitude slower than for more conventional weak links. Most unexpectedly, the thermal activation energies are found to be proportional to the width of the device, taken perpendicular to the current flow. This behavior falls outside the range of established theories; we propose that it is a fluctuation effect caused by giant shot noise associated with multiple Andreev reflections. The possibility of non-equilibrium effects is discussed.

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Section: Width Dependence a Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Current-voltage characteristics of semiconductor-coupled superconducting weak links with large electrode separations

et al. 1998

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“…5. More recent experiments on arrays of superconducting weak links based on InAs-AlSb quantum wells with Nb electrodes 7 may also suggest interjunction coupling due to long-range magnetic effects, and we will, therefore, investigate the nature of the external magnetic coupling in some detail.…”

Section: Introductionmentioning

confidence: 99%

Magnetic interaction between spatially extended superconducting tunnel junctions

Grønbech‐Jensen

Samuelsen

2002

Phys. Rev. B

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A general description of magnetic interactions between superconducting tunnel junctions is given. The description covers a wide range of possible experimental systems, and we explicitly explore two experimentally relevant limits of coupled junctions. One is the limit of junctions with tunneling distance much smaller than the London penetration depth of the superconductors, the other is the limit where the tunneling distance is much larger than the London penetration depth. The former case has previously been studied in the context of adjacent conventional Josephson junctions, while the latter has been considered through arrays of superconducting weak links based on semiconductor quantum wells with superconducting electrodes. We use the model to make direct interpretations of the published experiments and thereby propose that long-range magnetic interactions are responsible for the reported experimental signatures of coupling between tunnel junctions.

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Nonequilibrium Josephson-like effects in wide mesoscopic SNS junctions

Argaman

1999

Superlattices and Microstructures

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Mesoscopic superconducting-normal-metal-superconducting (S-N-S) junctions with a large separation between the superconducting electrodes (i.e. wide junctions) exhibit nonequilibrium supercurrents, even at temperatures for which the equilibrium Josephson effect is exponentially small. The second harmonic of the Josephson frequency dominates these currents, as observed in recent experiments. A simple description of these effects, in the spirit of the Resistively-Shunted-Junction model, is suggested here. It is used to calculate dc I-V characteristics, and to examine the effects of various types of noise and of external microwave radiation (Shapiro steps). It is found that the nonequilibrium supercurrents are excited when the junction is driven by a dc bias or an ac bias, or even by external noise. In the case of junctions which are also long in the direction perpendicular to the current flow, thermodynamic phase fluctuations (thermal noise) alone can drive the quasiparticles out of local equilibrium. Magnetic flux is then predicted to be trapped in units of Φ0/2 = hc/4e.

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Flux-periodic resistance oscillations in arrays of superconducting weak links based on InAs-AlSb quantum wells with Nb electrodes

Cited by 7 publications

References 10 publications

Current-voltage characteristics of semiconductor-coupled superconducting weak links with large electrode separations

Current-voltage characteristics of semiconductor-coupled superconducting weak links with large electrode separations

Magnetic interaction between spatially extended superconducting tunnel junctions

Nonequilibrium Josephson-like effects in wide mesoscopic SNS junctions

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