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

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Schäpers, Th. and Guzenko, V.A. and Müller, R.P. and Golubov, A.A. and Brinkman, A. and Crecelius, G. and Kaluza, A. and Lüth, H. (2003) Current-injection in a ballastic multiterminal superconductor/two-dimensional electron gas Josephson junction. Physical Review B: Condensed matter and materials physics, 67 (1). 014522. ISSN 1098-0121

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Abstract: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.
Item Type:Article
Copyright:© 2003 The American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/40549
Official URL:http://dx.doi.org/10.1103/PhysRevB.67.014522
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Metis ID: 212385