Phase coherence in superconducting and molecular nanostructures

• Unité de recherche: COST
• Numéro de projet: C99.0115
• Titre du projet anglais: Phase coherence in superconducting and molecular nanostructures

Mots-clé (Anglais)

Theory of Nanostructures; Mesoscopic Superconductivity; Quantum Coherence; Molecular Electronics

Programme de recherche (Anglais)

COST-Action P5 - Mesoscopic electronics

Description succincte (Anglais)

See abstract

Partenaires et organisations internationales (Anglais)

A, B, CZ, DK, FIN, F, D, H, I, NL, PL, SK, E, S, CH, GB

Résumé des résultats (Abstract) (Anglais)

We have calculated the dephasing rate of ultracold atoms in an atomic waveguide subject to a fluctuating current. Taking excited states of the trap into account, we find a dephasing rate that scales like the fourth power of the distance of the trap minimum to the wire. In addition, we have analyzed the difference between dephasing and phase averaging in an experimentally relevant Mach-Zehnder interferometer device. We have also discussed dephasing in a symmetric interference setup consisting of two single-level quantum dots. Finally, we have discovered a new mechanism that may lead to positive cross-correlations beween the currents in two leads of a three-terminal quantum dot with ferromagnetic leads, viz., dynamical spin blockade.

Références bases de données (Anglais)

Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. [phone] Swiss Project-Number: C99.0115