Spin dynamics in two-dimensional electron and hole systems revealed by resonant spin amplification

T. Korn; M. Griesbeck; M. Kugler; S. Furthmeier; C. Gradl; M. Hirmer; D. Schuh; W. Wegscheider; K. Korzekwa; P. Machnikowski; T. Kuhn; M. M. Glazov; E. Ya. Sherman; C. Schüller

doi:10.1117/12.930840

9 October 2012 Spin dynamics in two-dimensional electron and hole systems revealed by resonant spin amplification

T. Korn, M. Griesbeck, M. Kugler, S. Furthmeier, C. Gradl, M. Hirmer, D. Schuh, W. Wegscheider, K. Korzekwa, P. Machnikowski, T. Kuhn, M. M. Glazov, E. Ya. Sherman, C. Schüller

Author Affiliations +

Proceedings Volume 8461, Spintronics V; 84610O (2012) https://doi.org/10.1117/12.930840
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

Abstract

Understanding and controlling the spin dynamics in semiconductor heterostructures is a key requirement for the design of future spintronics devices. In GaAs-based heterostructures, electrons and holes have very different spin dynamics. Some control over the spin-orbit fields, which drive the electron spin dynamics, is possible by choosing the crystallographic growth axis. Here, (110)-grown structures are interesting, as the Dresselhaus spinorbit fields are oriented along the growth axis and therefore, the typically dominant Dyakonov-Perel mechanism is suppressed for spins oriented along this axis, leading to long spin depasing times. By contrast, hole spin dephasing is typically very rapid due to the strong spin-orbit interaction of the p-like valence band states. For localized holes, however, most spin dephasing mechanisms are suppressed, and long spin dephasing times may be observed. Here, we present a study of electron and hole spin dynamics in GaAs-AlGaAs-based quantum wells. We apply the resonant spin amplification (RSA) technique, which allows us to extract all relevant spin dynamics parameters, such as g factors and dephasing times with high accuracy. A comparison of the measured RSA traces with the developed theory reveals the anisotropy of the spin dephasing in the (110)-grown two-dimensional electron systems, as well as the complex interplay between electron and hole spin and carrier dynamics in the two-dimensional hole systems.

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T. Korn, M. Griesbeck, M. Kugler, S. Furthmeier, C. Gradl, M. Hirmer, D. Schuh, W. Wegscheider, K. Korzekwa, P. Machnikowski, T. Kuhn, M. M. Glazov, E. Ya. Sherman, and C. Schüller "Spin dynamics in two-dimensional electron and hole systems revealed by resonant spin amplification", Proc. SPIE 8461, Spintronics V, 84610O (9 October 2012); https://doi.org/10.1117/12.930840

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