Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-04-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.76.115313
We study the magnetotransport in small hybrid junctions formed by high-mobility GaInAs/InP heterostructures coupled to superconducting (S) and normal metal (N) terminals. Highly transmissive superconducting contacts to a two-dimensional electron gas (2DEG) located in a GaInAs/InP heterostructure are realized by using a Au/NbN layer system. The magnetoresistance of the S/2DEG/N structures is studied as a function of dc bias current and temperature. At bias currents below a critical value, the resistance of the S/2DEG/N structures develops a strong oscillatory dependence on the magnetic field, with an amplitude of the oscillations considerably larger than that of the reference N/2DEG/N structures. The experimental results are qualitatively explained by taking Andreev reflection in high magnetic fields into account.
Batov Igor E.
Chtchelkatchev Nikolay M.
Hardtdegen Hilde
Schäpers Th.
Ustinov Alexey V.
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