Interplay of Rashba, Zeeman and Landau splitting in a magnetic two-dimensional electron gasY. S. Gui, C. R. Becker, J. Liu, V. Daumer, V. Hock, H. Buhmann and L. W. Molenkamp
Physikalisches Institut (EP 3), Universität Würzburg Am Hubland, 97074 Würzburg, Germany email@example.com
(Received 5 August 2003; accepted in final form 21 November 2003)
The transport properties of a magnetic two-dimensional electron gas consisting of a modulation doped n-type quantum well, QW, have been investigated. By analyzing the Shubnikov-de Haas oscillations and the node positions of their beating patterns, we have been able to separate the gate-voltage-dependent Rashba spin-orbit splitting from the temperature-dependent giant Zeeman splitting. It has been experimentally demonstrated that the Rashba spin-orbit splitting is larger than or comparable to the sp- d exchange-interaction-induced giant Zeeman splitting in this magnetic 2DEG even at moderately high magnetic fields.
71.70.Ej - Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect.
71.70.Gm - Exchange interactions.
72.20.My - Galvanomagnetic and other magnetotransport effects.
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