Josephson Effect in a Few-Hole Quantum Dot.
Adv Mater
; 30(44): e1802257, 2018 Nov.
Article
em En
| MEDLINE
| ID: mdl-30260519
ABSTRACT
A Ge-Si core-shell nanowire is used to realize a Josephson field-effect transistor with highly transparent contacts to superconducting leads. By changing the electric field, access to two distinct regimes, not combined before in a single device, is gained in the accumulation mode the device is highly transparent and the supercurrent is carried by multiple subbands, while near depletion, the supercurrent is carried by single-particle levels of a strongly coupled quantum dot operating in the few-hole regime. These results establish Ge-Si nanowires as an important platform for hybrid superconductor-semiconductor physics and Majorana fermions.
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MEDLINE
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En
Ano de publicação:
2018
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Article