Energy Spectroscopy of Andreev Levels between Two Superconductors

Journal Article · Sat Nov 01 00:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.4010· OSTI ID:553123

Morpurgo, A F; van Wees, B J; Klapwijk, T M ^[1]; Borghs, G ^[2]

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1. Department of Applied Physics and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen (The Netherlands)
2. Interuniversity Microelectronics Center, Kapeldreef 75, B-3030, Leuven (Belgium)

We perform energy spectroscopy of Andreev reflection processes occurring at two superconducting electrodes connected in series via a ballistic two dimensional channel, by measuring the voltage dependence of that part of the conductance modulated by the macroscopic phase difference. The amplitude of the modulation oscillates as a function of energy and the phase exhibits an abrupt shift close to {pi} at the energy for which the amplitude is minimum. A microscopic theoretical description ascribes the phenomenon to the precursor of a bound state formed between the two superconductors. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 553123
• Journal Information: Physical Review Letters, Vol. 79, Issue 20; Other Information: PBD: Nov 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
SUPERCONDUCTING JUNCTIONS
REFLECTION
PHASE SHIFT
MODULATION
BOUND STATE
ENERGY LEVELS
OSCILLATIONS
NIOBIUM
INDIUM ARSENIDES
TUNNEL EFFECT