### 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.

Language | English |
---|---|

Article number | 085311 |

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

Volume | 88 |

Issue number | 8 |

DOIs | |

Publication status | Published - 12 Aug 2013 |

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### Keywords

- Si quantum dots
- silicon
- quantum dots

### Cite this

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

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

}

*Physical Review B - Condensed Matter and Materials Physics*, vol. 88, no. 8, 085311. https://doi.org/10.1103/PhysRevB.88.085311

**Coulomb interaction and valley-orbit coupling in Si quantum dots.** / Jiang, Luyao; Yang, C. H.; Pan, Zhaodi; Rossi, Alessandro; Dzurak, Andrew S.; Culcer, Dimitrie.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Coulomb interaction and valley-orbit coupling in Si quantum dots

AU - Jiang, Luyao

AU - Yang, C. H.

AU - Pan, Zhaodi

AU - Rossi, Alessandro

AU - Dzurak, Andrew S.

AU - Culcer, Dimitrie

PY - 2013/8/12

Y1 - 2013/8/12

N2 - 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.

AB - 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.

KW - Si quantum dots

KW - silicon

KW - quantum dots

UR - http://www.scopus.com/inward/record.url?scp=84884516505&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.88.085311

DO - 10.1103/PhysRevB.88.085311

M3 - Article

VL - 88

JO - Physical Review B: Condensed Matter and Materials Physics

T2 - Physical Review B: Condensed Matter and Materials Physics

JF - Physical Review B: Condensed Matter and Materials Physics

SN - 1098-0121

IS - 8

M1 - 085311

ER -