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Neuróhr, K.; Golubov, A. A.; Klocke, Th.; Kaufmann, James; Schäpers, Th.; Appenzeller, Joerg; Uhlisch, D.; Ustinov, A. V.; Hollfelder, M.; Lüth, H.; Braginski, A. I.

doi:10.1103/physrevb.54.17018

Cited by 32 publications

(45 citation statements)

References 30 publications

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“…Although the BTK model does not include effects of disorder and an intermediate non-superconducting layer at the interface [1], it is widely applied to both ballistic and diffusive systems, in order to obtain an estimate of the junction transmissivity. In the BTK model, a potential barrier at the interface is approximated by a δ-function potential.…”

Section: Discussion and Comparison With Theorymentioning

confidence: 99%

“…Below we will argue that the new double-dip structure in the differential resistance detected in our measurements is related to the transport in SN-2DEG contacts in a ballistic regime [1]. Experimental data for zero magnetic field will be analyzed in our work within the quasiclassical model for the proximity effect developed in [1,36]. A schematic of the sample layout is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Various new effects arising due to the Andreev reflection at the S/2DEG interface were studied in such systems, both theoretically and experimentally [1,2,3,4,5,6,7,8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

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Andreev reflection and enhanced subgap conductance in NbN∕Au∕InGaAs-InP junctions

Batov

Schaepers

Golubov

et al. 2004

Journal of Applied Physics

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We report on the fabrication of highly transparent superconductor/normal metal/twodimensional electron gas junctions formed by a superconducting NbN electrode, a thin (10nm) Au interlayer, and a two-dimensional electron gas in a InGaAs/InP heterostructure. High junction transparency has been achieved by exploiting of a newly developed process of Au/NbN evaporation and rapid annealing at 400 • C. This allowed us to observe for the first time a decrease in the differential resistance with pronounced double-dip structure within the superconducting energy gap in superconductor-2DEG proximity systems. The effect of a magnetic field perpendicular to the plane of the 2DEG on the differential resistance of the interface was studied. It has been found that the reduced subgap resistance remains in high magnetic fields. Zero-field data are analyzed within the previously established quasiclassical model for the proximity effect.

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Section: Discussion and Comparison With Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Andreev reflection and enhanced subgap conductance in NbN∕Au∕InGaAs-InP junctions

Batov

Schaepers

Golubov

et al. 2004

Journal of Applied Physics

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“…Then, the bulk SC is known to induce a hard gap in the NW, ∆ i ≈ γ i [34,36]. A more general treatment of the SC-NW interface that takes into account higher orders in t ⊥,i (i.e., highly transparent interfaces) is outside the scope of the present work, and we refer the reader to the well-known bibliography on the subject [38][39][40].…”

Section: ⊥Imentioning

confidence: 99%

Soft Superconducting Gap in Semiconductor Majorana Nanowires

et al. 2013

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We theoretically consider the ubiquitous soft gap measured in the tunneling conductance of semiconductorsuperconductor hybrid structures, in which recently observed signatures of elusive Majorana bound states have created much excitement. We systematically study the effects of magnetic and non-magnetic disorder, temperature, dissipative Cooper pair breaking, and interface inhomogeneity, which could lead to a soft gap. We find that interface inhomogeneity with moderate dissipation is the only viable mechanism that is consistent with the experimental observations. Our work indicates that improving the quality of the superconductor-semiconductor interface should result in a harder induced gap.

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“…21,22 Furthermore, the low Schottky barrier leads to a high transparency at the superconductor/2DEG interface. 23 Two different modes of injection are employed. First, in the three-terminal configuration the injection current is driven from a normal conducting terminal to one of the superconducting electrodes.…”

Section: Introductionmentioning

confidence: 99%

Current-injection in a ballistic multiterminal superconductor/two-dimensional electron gas Josephson junction

et al. 2003

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We study the suppression of the critical current in a multi-terminal superconductor/two-dimensional electron gas/superconductor Josephson junction by means of hot carrier injection. As a superconductor Nb is used, while the two-dimensional electron gas is located in a strained InGaAs/InP heterostructure. Two different modes of injection are employed. First, in the three-terminal injection mode, where the injection current flows from an injector contact to one of the superconducting electrodes, only a partial suppression is obtained. Second, in the four-terminal mode, where the injection current flows between two opposite injector contacts, a complete suppression is achieved. A theoretical model for the critical current suppression in a short junction is presented, which takes the two-dimensional character of the junction into account. Qualitatively, the experimental data agree well with the theoretical predictions. The injection voltage required in the experiment to suppress the supercurrent is lower than theoretically predicted. This is explained by the fact that the width of the normal region of the junction is slightly too large to be in the short-junction limit.

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Properties of lateral Nb contacts to a two-dimensional electron gas in anIn0.77Ga0.23

Cited by 32 publications

References 30 publications

Andreev reflection and enhanced subgap conductance in NbN∕Au∕InGaAs-InP junctions

Andreev reflection and enhanced subgap conductance in NbN∕Au∕InGaAs-InP junctions

Soft Superconducting Gap in Semiconductor Majorana Nanowires

Current-injection in a ballistic multiterminal superconductor/two-dimensional electron gas Josephson junction

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