Spintronics: electron spin coherence, entanglement, and transport

Details Spintronics: electron spin coherence, entanglement, and transport Spintronics: electron spin coherence, entanglement, and transport

1999-12-02

arxiv.org/abs/cond-mat/9912040v3

Superlattices and Microstructures 27, 289 (2000).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages and 3 eps figures. To appear in the proceedings of the Surfaces and Interfaces of Mesoscopic Devices 99. Acknowledgmen

Scientific paper

10.1006/spmi.2000.0829

Prospect of building spintronic devices in which electron spins store and transport information has attracted strong attention in recent years. Here we present some of our representative theoretical results on three fundamental aspects of spintronics: spin coherence, spin entanglement, and spin transport. In particular, we discuss our detailed quantitative theory for spin relaxation and coherence in electronic materials, resolving in the process a long-standing puzzle of why spin relaxation is extremely fast in Al (compared with other simple metals). In the study of spin entanglement, we consider two electrons in a coupled GaAs double-quantum-dot structure and explore the Hilbert space of the double dot. The specific goal is to critically assess the quantitative aspects of the proposed spin-based quantum dot quantum computer architecture. Furthermore, we discuss our theory of spin-polarized transport across a semiconductor-metal interface. In particular, we study Andreev reflection, which enables us to quantify the degree of carrier spin polarization and the strength of interfacial scattering.

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