Quasiparticle transport and induced superconductivity in InAs-AlSb quantum wells with Nb electrodes

Kroemer, H.; Nguyen, C.; Hu, Evelyn L.; Yuh, E.L.; Thomas, M.; Wong, K. C.

doi:10.1016/0921-4526(94)90073-6

Cited by 23 publications

(9 citation statements)

References 17 publications

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“…Figure 3 shows the variation of the current with temperature, T, when the interface is transparent [25,26]. As shown from our results our theory fits nicely the available experimental results [21][22][23][24][25][26].…”

Section: Results and Conclusionsupporting

confidence: 78%

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Quantum Transport in a Superconductor-Semiconductor Mesoscopic System

Aly

Phillips

2002

phys. stat. sol. (b)

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PACS: 73.30.+y; 73.40.Gk The quantum transport characteristics of a mesoscopic system are studied. Using the WKB method the current density was derived due to both, normal tunneling and Andreev reflection processes. The tunneling process was treated as a stochastic process, therefore, the energies of the tunneled electrons and the value of the Schottky barrier height at the S-Sm interface are determined by using a Monte-Carlo simulation technique. Numerical calculation of the current has been performed at different temperatures and bias voltage. The obtained results fit nicely with the experimental results in the literature. These results are very important for nanotechnology applications.

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Section: Results and Conclusionsupporting

confidence: 78%

“…A further confirmation of the present theory has been done. Figures 1-3 show the variation of the current with temperature, T, and with the bias voltage, V 0 , when the Schottky barrier was considered [22][23][24]. This is the case of Si.…”

Section: Results and Conclusionmentioning

confidence: 99%

Quantum Transport in a Superconductor-Semiconductor Mesoscopic System

Aly

Phillips

2002

phys. stat. sol. (b)

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“…For the numerical computation of the proximityinduced pair potential and the current-voltage characteristics we use system parameters similar to the ones reported by the Kroemer group [9,10,12]. We assume that the InAs channel extends in x-direction over 15 nm (thickness L x ), and in z-direction the extensions of the insulating layers between the Nb electrodes, 2a, and of the Nb electrodes themselves, D − a, are about 500nm.…”

Section: Proximity Effectmentioning

confidence: 99%

“…One observes peculiar (subgap) structures [5]- [7], [9]- [12] and spikes [11] in the differential resistances, and current-voltage characteristics (CVCs) show first a steep rise of the current, then a plateau and finally a linear current increase with "high" voltages [10,12]. The observed phenomena are interpreted in terms of Andreev reflections [5]- [12].…”

Section: Introductionmentioning

confidence: 99%

Proximity effect, Andreev reflections, and charge transport in mesoscopic superconducting/semiconducting heterostructures

Jacobs

Kümmel

Plehn

1999

Superlattices and Microstructures

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Received ( )In the quasi-twodimensional (Q2D) electron gas of an InAs channel between an AlSb substrate and superconducting Niobium layers the proximity effect induces a pair potential so that a Q2D mesoscopic superconducting-normal-superconducting (SNS) junction forms in the channel. The pair potential is calculated with quasiclassical Green's functions in the clean limit. For such a junction alternating Josephson currents and current-voltage characteristics (CVCs) are computed, using the non-equilibrium quasiparticle wavefunctions which solve the time-dependent Bogoliubov-de Gennes Equations. The CVCs exhibit features found experimentally by the Kroemer group: A steep rise of the current at small voltages ("foot") changes at a "corner current" to a much slower increase of current with higher voltages, and the zero-bias differential resistance increases with temperature. Phase-coherent multiple Andreev reflections and the associated Cooper pair transfers are the physical mechanisms responsible for the oscillating Josephson currents and the CVCs. Additional experimental findings not reproduced by the theory require model improvements, especially a consideration of the external current leads which should give rise to hybrid quasiparticle/collective-mode excitations.

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“…By varying L x and L y one can vary the dimensionality of the system. By showing in detail how in any transport experiment involving superconductors electron ↔ hole scattering brings about normal current ↔ supercurrent conversion our analysis may also prove useful for the understanding of transport phenomena in quasi-two-dimensional (Q2D) superconducting/semiconducting heterojunctions [20][21][22] and superconducting quantum dots in Q2D channels.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of conversion of supercurrents into normal currents and vice versa

Jacobs

Kümmel

2001

Phys. Rev. B

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The generation and destruction of the supercurrent in a superconductor (S) between two resistive normal (N ) current leads connected to a current source is computed from the source equation for the supercurrent density. This equation relates the gradient of the pair potential's phase to electron and hole wavepackets that create and destroy Cooper pairs in the N/S interfaces. Total Andreev reflection and supercurrent transmission of electrons and holes are coupled together by the phase rigidity of the non-bosonic Cooper-pair condensate. The calculations are illustrated by snapshots from a computer film.

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Quasiparticle transport and induced superconductivity in InAs-AlSb quantum wells with Nb electrodes

Cited by 23 publications

References 17 publications

Quantum Transport in a Superconductor-Semiconductor Mesoscopic System

Quantum Transport in a Superconductor-Semiconductor Mesoscopic System

Proximity effect, Andreev reflections, and charge transport in mesoscopic superconducting/semiconducting heterostructures

Dynamics of conversion of supercurrents into normal currents and vice versa

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