Eur. Phys. J. B 72, 139-144 (2009)
https://doi.org/10.1140/epjb/e2009-00346-5

Resonant charge and spin transport in a -stub coupled to a superconductor

¹ Institut für Festkörper-Forschung–Theorie3, Forschungszentrum Jülich, 52425 Jülich, Germany
² Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen, Germany
³ Harish-Chandra Research Institute, Chhatnag Road, Jhusi, 211 019 Allahabad, India

Corresponding author: ^a arijit.saha@weizmann.ac.il

Received: 5 June 2009
Revised: 10 August 2009
Published online: 13 October 2009

Abstract

We study transport through a single channel -stub geometry strongly coupled to a superconducting reservoir. In contrast to the standard stub geometry which has both transmission resonances and anti-resonances in the coherent limit, we find that due to the proximity effect, this geometry shows neither a T = 1 resonance (T is the transmission probability for electrons incident on the -stub) nor a T = 0 anti-resonance as we vary the energy of the incident electron. Instead, we find that there is only one resonant value at T = 1/4, where charge transport vanishes while the spin transport is perfect.