Reflectionless tunneling in planar Nb/GaAs hybrid junctions

Cecchini, M; Pingue, Pasqualantonio; Beltram, Fabio; Lazzarino, M.; Orani, D.; Rubini, S.; Franciosi, A.

doi:10.1063/1.1357211

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Reflectionless tunneling was observed in Nb/GaAs superconductor/semiconductor junctionsfabricated by a two-step procedure. First, periodic δ-doped layers were grown by molecular-beam epitaxy near the GaAssurface, followed by an As cap layer to protect the surface during ex situ transfer. Second, Nb was deposited by dc-magnetron sputtering onto a GaAs(001) 2×4surfacein situ after thermal desorption of the cap layer. The magnetotransport behavior of the resulting hybrid junctions was successfully analyzed within the random matrix theory of phase-coherent Andreev transport. The impact of junction morphology on reflectionless tunneling and the applicability of the fabrication technique to the realization of complex superconductor/semiconductor mesoscopic systems are discussed.

Titolo:	Reflectionless tunneling in planar Nb/GaAs hybrid junctions
Autori:	CECCHINI M PINGUE, Pasqualantonio BELTRAM, Fabio M. LAZZARINO D. ORANI S. RUBINI A. FRANCIOSI mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2000
Rivista:	APPLIED PHYSICS LETTERS
Abstract:	Reflectionless tunneling was observed in Nb/GaAs superconductor/semiconductor junctionsfabricated by a two-step procedure. First, periodic δ-doped layers were grown by molecular-beam epitaxy near the GaAssurface, followed by an As cap layer to protect the surface during ex situ transfer. Second, Nb was deposited by dc-magnetron sputtering onto a GaAs(001) 2×4surfacein situ after thermal desorption of the cap layer. The magnetotransport behavior of the resulting hybrid junctions was successfully analyzed within the random matrix theory of phase-coherent Andreev transport. The impact of junction morphology on reflectionless tunneling and the applicability of the fabrication technique to the realization of complex superconductor/semiconductor mesoscopic systems are discussed.
Handle:	http://hdl.handle.net/11384/12686
Appare nelle tipologie:	1.1 Articolo in rivista

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