APS » PROLA » Phys. Rev. B » Volume 48 » Issue 4
< Previous article | Next article >

Phys. Rev. B 48, 2811 - 2814 (1993)

Three signatures of phase-coherent Andreev reflection

Download: Page Images , PDF (734 kB), or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

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

Rapid Communication Received 4 May 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

[ Abstract  |  Previous article  |  Next article  |  Issue 4 ]