Tunable singlet-triplet splitting in a few-electron Si/SiGe quantum dot

Shi, Zhan and Simmons, C. B. and Prance, J. R. and Gamble, John King and Friesen, Mark and Savage, D. E. and Lagally, M. G. and Coppersmith, S. N. and Eriksson, M. A. (2011) Tunable singlet-triplet splitting in a few-electron Si/SiGe quantum dot. Applied Physics Letters, 99 (23): 233108. -. ISSN 0003-6951

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We measure the excited-state spectrum of a Si/SiGe quantum dot as a function of in-plane magnetic field and identify the spin of the lowest three eigenstates in an effective two-electron regime. We extract the singlet-triplet splitting, an essential parameter for spin qubits, from the data. We find it to be tunable by lateral displacement of the dot, which is realized by changing two gate voltages on opposite sides of the device. We present calculations showing the data are consistent with a spectrum in which the first excited state of the dot is a valley-orbit state. (C) 2011 American Institute of Physics. [doi:10.1063/1.3666232]

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Journal Article
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Applied Physics Letters
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?? physicsphysics and astronomy (miscellaneous)qc physics ??
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26 Oct 2012 14:14
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15 Jul 2024 13:21