Journal
PHYSICAL REVIEW B
Volume 86, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.115319
Keywords
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Funding
- Australian National Fabrication Facility
- Australian Research Council [CE110001027]
- US Army Research Office [W911NF-08-1-0527]
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Understanding interactions between orbital and valley quantum states in silicon nanodevices is crucial in assessing the prospects of spin-based qubits. We study the energy spectra of a few-electron silicon metal-oxide-semiconductor quantum dot using dynamic charge sensing and pulsed-voltage spectroscopy. The occupancy of the quantum dot is probed down to the single-electron level using a nearby single-electron transistor as a charge sensor. The energy of the first orbital excited state is found to decrease rapidly as the electron occupancy increases from N = 1 to 4. By monitoring the sequential spin filling of the dot we extract a valley splitting of similar to 230 mu eV, irrespective of electron number. This indicates that favorable conditions for qubit operation are in place in the few-electron regime.
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