A superconductor/semiconductor/superconductor junction with a long-split gate

✍ Scribed by Hideaki Takayanagi; Etsuko Toyoda; Tatsushi Akazaki

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 509 KB
• Volume: 25
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1999.0754

✦ Synopsis

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.