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

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

2011-09-02

arxiv.org/abs/1109.0511v2

Appl. Phys. Lett. 99, 233108 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages with 3 figures

Scientific paper

10.1063/1.3666232

We measure the excited-state spectrum of a Si/SiGe quantum dot as a function of in-plane magnetic field, and we identify the spin of the lowest three eigenstates in an effective two-electron regime. The singlet-triplet splitting is an essential parameter describing spin qubits, and we extract this splitting 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.

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