Frolov, S.M. and Lüscher, S. and Yu, W. and Ren, Y. and Folk, J.A. and Wegscheider, Werner (2009) Ballistic spin resonance. nature 458 (458), pp. 868-871.
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The phenomenon of spin resonance has had far-reaching influence since its discovery 70 years ago1. Electron spin resonance driven by high-frequency magnetic fields has enhanced our understanding of quantum mechanics, and finds application in fields as diverse as medicine and quantum information2. Spin resonance can also be induced by high-frequency electric fields in materials with a spin–orbit interaction; the oscillation of the electrons creates a momentum-dependent effective magnetic field acting on the electron spin3, 4, 5, 6, 7, 8, 9. Here we report electron spin resonance due to a spin–orbit interaction that does not require external driving fields. The effect, which we term ballistic spin resonance, is driven by the free motion of electrons that bounce at frequencies of tens of gigahertz in micrometre-scale channels of a two-dimensional electron gas. This is a frequency range that is experimentally challenging to access in spin resonance, and especially difficult on a chip. The resonance is manifest in electrical measurements of pure spin currents10—we see a strong suppression of spin relaxation length when the oscillating spin–orbit field is in resonance with spin precession in a static magnetic field. These findings illustrate how the spin–orbit interaction can be harnessed for spin manipulation in a spintronic circuit11, and point the way to gate-tunable coherent spin rotations in ballistic nanostructures without external alternating current fields.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Partially|
|Deposited On:||30 Jun 2009 08:21|
|Last Modified:||05 Aug 2009 13:59|