DOI: 10.1142/s0217984903005913. Coherent Transport in Nb/δ-Doped-GaAs Hybrid Microstructures

Coherent Transport in Nb/δ-Doped-GaAs Hybrid Microstructures

10.1142/s0217984903005913

Crossref journal-article

World Scientific Pub Co Pte Lt

Modern Physics Letters B (219)

Abstract

Coherent transport in Nb/GaAs superconductor-semiconductor microstructures is presented. The structure fabrication procedure is based on δ-doped layers grown by molecular-beam-epitaxy near the GaAs surface, followed by an As cap layer to protect the active semiconductor layers during ex situ transfer. The superconductor is then sputter deposited in situ after thermal desorption of the protective layer. Two types of structures in particular will be discussed, i.e. a reference junction and the engineered one that contains an additional insulating AlGaAs barrier inserted during the growth in the semiconductor. This latter configuration may give rise to controlled interference effects and realizes the model introduced by de Gennes and Saint-James in 1963. While both structures show reflectionless tunneling-dominated transport, only the engineered junction shows additionally a low-temperature single marked resonance peaks superimposed to the characteristic Andreev-dominated subgap conductance. The analysis of coherent magnetotransport in both microstructures is successfully performed within the random matrix theory of Andreev transport and ballistic effects are included by directly solving the Bogoliubov–de Gennes equations. The impact of junction morphology on reflectionless tunneling and the application of the employed fabrication technique to the realization of complex semiconductor-superconductor systems are also discussed.

Bibliography

Giazotto, F., Pingue, P., & Beltram, F. (2003). Coherent Transport in Nb/Î´-Doped-GaAs Hybrid Microstructures. Modern Physics Letters B, 17(18), 955â971.

Authors 3

F. Giazotto (first)
P. Pingue (additional)
F. Beltram (additional)

References 33 Referenced 9

{'key': 'rf1', 'first-page': '1823', 'volume': '46', 'author': 'Andreev A. F.', 'journal-title': 'Zh. Eksp. Teor. Fiz.'} / Zh. Eksp. Teor. Fiz. by Andreev A. F.
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{'key': 'rf13', 'volume-title': 'Semiconductor Material and Device Characterization', 'author': 'Schroder D. K.', 'year': '1990'} / Semiconductor Material and Device Characterization by Schroder D. K. (1990)
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10.1007/978-3-642-74751-9

Dates

Type	When
Created	21 years, 11 months ago (Sept. 25, 2003, 5:28 p.m.)
Deposited	6 years ago (Aug. 6, 2019, 9:07 a.m.)
Indexed	2 years, 1 month ago (Aug. 1, 2023, 6:33 a.m.)
Issued	22 years ago (Aug. 10, 2003)
Published	22 years ago (Aug. 10, 2003)
Published Online	13 years, 9 months ago (Nov. 21, 2011)
Published Print	22 years ago (Aug. 10, 2003)

Funders 0

None

BibTeX

@article{Giazotto_2003, title={Coherent Transport in Nb/δ-Doped-GaAs Hybrid Microstructures}, volume={17}, ISSN={1793-6640}, url={http://dx.doi.org/10.1142/s0217984903005913}, DOI={10.1142/s0217984903005913}, number={18}, journal={Modern Physics Letters B}, publisher={World Scientific Pub Co Pte Lt}, author={Giazotto, F. and Pingue, P. and Beltram, F.}, year={2003}, month=aug, pages={955–971} }

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