Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 34: Spin controlled transport II

HL 34.5: Vortrag

Mittwoch, 25. März 2009, 15:15–15:30, BEY 118

High bandwidth detection of electrically detected magnetic resonance — •Hans Huebl, Robert P. Starrett, Laurens H. Willems van Beveren, Dane R. McCamey, and Andrew J. Fergusson — Centre for Quantum Computer Technology, University of New South Wales, Sydney, Australia

Several proposals discuss the realization of quantum computation with the help of the spin degree of freedom in semiconductors. Electrically detected magnetic resonance (EDMR) provides a well established tool to investigate spin states in semiconductors which was recently extended to investigate the spin dynamics of phosphorus donors in silicon. Typically, the detection bandwidth of EDMR is limited by the characteristic RC time constant of the setup. In this contribution we show that by embedding the sample in a LRC resonant circuit, a so-called tank circuit, it is possible to overcome this limitations. Here, we investigate a silicon MOSFET where the microwave magnetic field to induce the spin transitions is generated on chip by a shorted coplanar stripline[1]. We monitor the spin dependent change in resistance with a current amplifier and simultaneously perform rf-refectometry off the tank circuit. A spin resonance signature was observed in both cases. Investigating the detection bandwidth by using frequency modulation of the microwaves indicates that the spin signature observed is detected up to f_mod=1 MHz limited here by the electronic setup used. This shows that this method has the expected high bandwidth opening the view to faster phenomena in EDMR. [1] Willems van Beveren et al., APL 93, 072102 (2008)