A. Ney, R. Rajaram, et al.
Journal of Magnetism and Magnetic Materials
Electrical tuning of coherent electron spin dynamics is demonstrated in a specially designed AlxGa1-xAs quantum well in which the Al concentration x is parabolically varied across the structure. Application of an electric bias leads to a continuous displacement of an unperturbed wave function into regions with different Al concentration. Using time-resolved optical techniques, we directly observe gate-voltage mediated tunability of electron spin precession over a 13 GHz frequency range at low temperatures and at a fixed magnetic field of 6 T. Such control of spin coherence persists up to room temperature. Furthermore, complete suppression of spin precession and reversal of the sign of g is demonstrated. © 2002 Elsevier Science B.V. All rights reserved.
A. Ney, R. Rajaram, et al.
Journal of Magnetism and Magnetic Materials
R.D. Murphy, R.O. Watts
Journal of Low Temperature Physics
R. Ghez, J.S. Lew
Journal of Crystal Growth
Heinz Schmid, Hans Biebuyck, et al.
Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures