Spin manipulation of free two-dimensional electrons in Si/SiGe quantum wells |
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Authors: | Tyryshkin A M Lyon S A Jantsch W Schäffler F |
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Affiliation: | Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544 USA. |
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Abstract: | Understanding the mechanisms controlling the spin coherence of electrons in semiconductors is essential for designing structures for quantum computing applications. Using a pulsed electron paramagnetic resonance spectrometer, we measure spin echoes and deduce a spin coherence time (T2) of up to 3 mus for an ensemble of free two-dimensional electrons confined in a Si/SiGe quantum well. The decoherence can be understood in terms of momentum scattering causing fluctuating effective Rashba fields. Further confining the electrons into a nondegenerate (other than spin) ground state of a quantum dot can be expected to eliminate this decoherence mechanism. |
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