Weak antilocalization in quantum wells in tilted magnetic fields

Details Weak antilocalization in quantum wells in tilted magnetic fields Weak antilocalization in quantum wells in tilted magnetic fields

2003-12-02

arxiv.org/abs/cond-mat/0312074v1

Phys. Rev. B 70, 155323(1-7) (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 8 figures

Scientific paper

10.1103/PhysRevB.70.155323

Weak antilocalization is studied in an InGaAs quantum well. Anomalous magnetoresistance is measured and described theoretically in fields perpendicular, tilted and parallel to the quantum well plane. Spin and phase relaxation times are found as functions of temperature and parallel field. It is demonstrated that spin dephasing is due to the Dresselhaus spin-orbit interaction. The values of electron spin splittings and spin relaxation times are found in the wide range of 2D density. Application of in-plane field is shown to destroy weak antilocalization due to competition of Zeeman and microroughness effects. Their relative contributions are separated, and the values of the in-plane electron g-factor and characteristic size of interface imperfections are found.

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