The role of orbital dynamics in spin relaxation and weak antilocalization in quantum dots

Details The role of orbital dynamics in spin relaxation and weak antilocalization in quantum dots The role of orbital dynamics in spin relaxation and weak antilocalization in quantum dots

2004-05-12

arxiv.org/abs/cond-mat/0405266v2

Phys. Rev. Lett. 94, 026809 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages

Scientific paper

10.1103/PhysRevLett.94.026809

We develop a semiclassical theory for spin-dependent quantum transport to describe weak (anti)localization in quantum dots with spin-orbit coupling. This allows us to distinguish different types of spin relaxation in systems with chaotic, regular, and diffusive orbital classical dynamics. We find, in particular, that for typical Rashba spin-orbit coupling strengths, integrable ballistic systems can exhibit weak localization, while corresponding chaotic systems show weak antilocalization. We further calculate the magnetoconductance and analyze how the weak antilocalization is suppressed with decreasing quantum dot size and increasing additional in-plane magnetic field.

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