Spin effects in coherent nanoconductors with ferromagnetic contacts

Audrey Cottet (1)

1 LPA - Laboratoire Pierre Aigrain

The manipulation of the electronic spin degree of freedom is an important goal in the context of the development of quantum information and spin electronics. Coherent conductors connected to ferromagnetic contacts are particularly interesting in this context. Indeed, they are subject to spin-dependent quantum interferences, which can be used to manipulate the spin degree of freedom. In this talk, I will focus on effective fields induced inside a coherent conductor by a ferromagnetic contact. I will first discuss the nature of these fields. Second, I will show that these effective fields can be used to design a spin quantum bit adapted for Circuit Quantum Electrodynamics experiments[1]. This setup is based on a double quantum dot connected to two non-collinear ferromagnetic contacts. This allows to obtain a strong spin/photon coupling, which can be switched on and off with a simple gate voltage. Third, I will show that the contact-induced effective fields can also be used to induce unconventional superconducting correlations inside a normal metal wire[2]. [1] A. Cottet and T. Kontos, Phys. Rev. Lett. 105, 160502 (2010) [2] A. Cottet, unpublished

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Audrey Cottet. Spin effects in coherent nanoconductors with ferromagnetic contacts. Seminar at the Institute for Theory of Statistical Physics Physikzentrum, University of Aachen, Jun 2011, Aix-La-Chapelle, Germany. ⟨hal-00605473⟩