Electrical control of spin relaxation in a quantum dot |
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Authors: | Amasha S Maclean K Radu Iuliana P Zumbühl D M Kastner M A Hanson M P Gossard A C |
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Institution: | Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. samasha@mit.edu |
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Abstract: | We demonstrate electrical control of the spin relaxation time T1 between Zeeman-split spin states of a single electron in a lateral quantum dot. We find that relaxation is mediated by the spin-orbit interaction, and by manipulating the orbital states of the dot using gate voltages we vary the relaxation rate W identical withT1(-1) by over an order of magnitude. The dependence of W on orbital confinement agrees with theoretical predictions, and from these data we extract the spin-orbit length. We also measure the dependence of W on the magnetic field and demonstrate that spin-orbit mediated coupling to phonons is the dominant relaxation mechanism down to 1 T, where T1 exceeds 1 s. |
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