A superconductor/semiconductor/superconductor junction with a long-split gate |
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| Institution: | 1. Universidad Autónoma de Madrid, Departamento de Física Aplicada, C/ Francisco Tomás y Valiente 7, 28049 Madrid, Spain;2. IREC, Catalonia Institute for Energy Research, C/ Jardins de les Dones de Negre 1, Sant Adriá del Besòs, 08930 Barcelona, Spain;3. Centres Científics i Tecnològics (CCiTUB) i Departament d′Enginyeria Electrònica i Biomèdica de la Universitat de Barcelona, C/ Lluis Solé i Sabaris, 08028 Barcelona, Spain;4. Department of Electronics and Information Systems (ELIS), Ghent University, iGhent tower, Technology Park 15, Zwijnaarde, 9052 Ghent, Belgium;5. Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, 9000 Ghent, Belgium;6. PVcomB, Helmholtz-Zentrum Berlin, Schwarzschildstraße 3, 12489 Berlin, Germany;1. School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea;2. Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea;3. Department of Electrical Engineering, Columbia University, New York, NY 10027, USA;1. SIMaP, University of Grenoble Alps, Grenoble, France;2. SIMaP, CNRS, Grenoble, France;3. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi, PR China;4. SIL’TRONIX-ST, Archamps, France |
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| Abstract: | Measurements of superconducting and normal transport in a superconductor/semiconductor/superconductor junction with a long-split gate show that when the two-dimensional electron gas in the semiconductor is put into the pinched-off state by applying a gate voltage, the two superconducting electrodes couple through a long and narrow channel with a small number of modes. Multiple Andreev reflections the focusing of Andreev-reflected holes are observed in this situation, but the supercurrent decreases quickly as gate voltage is increased and it disappears when the channel is long and narrow. A sharp conductance peak due to the coherent motion of the electrons and holes in the narrow channel is also observed. |
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