### Abstract

The valley-orbit coupling in a few-electron Si quantum dot is expected to be a function of its occupation number N. We study the spectrum of multivalley Si quantum dots for 2≤N≤4, showing that, counterintuitively, electron-electron interaction effects on the valley-orbit coupling are negligible. For N=2 they are suppressed by valley interference, for N=3 they vanish due to spinor overlaps, and for N=4 they cancel between different pairs of electrons. To corroborate our theoretical findings, we examine the experimental energy spectrum of a few-electron metal-oxide-semiconductor quantum dot. The measured spin-valley state filling sequence in a magnetic field reveals that the valley-orbit coupling is definitively unaffected by the occupation number.

Original language | English |
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Article number | 085311 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 88 |

Issue number | 8 |

DOIs | |

Publication status | Published - 12 Aug 2013 |

### Keywords

- Si quantum dots
- silicon
- quantum dots

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## Cite this

*Physical Review B - Condensed Matter and Materials Physics*,

*88*(8), [085311]. https://doi.org/10.1103/PhysRevB.88.085311