Spin and orbital structure of the first six holes in a silicon metal-oxide-semiconductor quantum dot

S. D. Liles (), R. Li, C. H. Yang, F. E. Hudson, M. Veldhorst, A. S. Dzurak and A. R. Hamilton
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S. D. Liles: University of New South Wales
R. Li: University of New South Wales
C. H. Yang: The University of New South Wales
F. E. Hudson: The University of New South Wales
M. Veldhorst: TU Delft
A. S. Dzurak: The University of New South Wales
A. R. Hamilton: University of New South Wales

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Valence band holes confined in silicon quantum dots are attracting significant attention for use as spin qubits. However, experimental studies of single-hole spins have been hindered by challenges in fabrication and stability of devices capable of confining a single hole. To fully utilize hole spins as qubits, it is crucial to have a detailed understanding of the spin and orbital states. Here we show a planar silicon metal-oxide-semiconductor-based quantum dot device and demonstrate operation down to the last hole. Magneto-spectroscopy studies show magic number shell filling consistent with the Fock–Darwin states of a circular two-dimensional quantum dot, with the spin filling sequence of the first six holes consistent with Hund’s rule. Next, we use pulse-bias spectroscopy to determine that the orbital spectrum is heavily influenced by the strong hole–hole interactions. These results provide a path towards scalable silicon hole-spin qubits.

Date: 2018
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DOI: 10.1038/s41467-018-05700-9

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