Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3666232
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Funding
- ARO and LPS [W911NF-08-1-0482]
- NSF [DMR-0805045]
- United States Department of Defense
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0805045] Funding Source: National Science Foundation
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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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