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APS » Journals » Phys. Rev. B » Volume 48 » Issue 4
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Phys. Rev. B 48, 2811–2814 (1993)

Three signatures of phase-coherent Andreev reflection

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I. K. Marmorkos and C. W. J. Beenakker
Instituut-Lorentz, University of Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands

R. A. Jalabert
Service de Physique de l’Etat Condensé, Commissariat à l’Energie Atomique de Saclay, 91191 Gif-sur-Yvette Cédex, France

Received 4 May 1993; published in the issue dated 15 July 1993

An efficient numerical scheme is developed to compute the differential conductance GNS of a disordered normal-metal–superconductor (NS) junction at voltages V and magnetic fields B. A sharp peak is found in GNS around V,B=0 in the case of a resistive NS interface, as observed experimentally and confirming the theory of ‘‘reflectionless tunneling.’’ An ideal interface shows a conductance dip, due to an enhanced weak-localization effect. Finally, it is demonstrared that time-reversal-symmetry breaking does not reduce the ‘‘universal conductance fluctuations’’ in GNS by a factor of 2.

© 1993 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.48.2811
DOI:
10.1103/PhysRevB.48.2811
PACS:
74.80.Fp, 73.40.Gk, 74.50.+r
 
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