Electronic states in Si quantum dots are theoretically examined, considering a multivalley structure of conduction band. In quantum dots smaller than about 5 nm, one-electron energy levels in equivalent valleys are filled consecutively with increasing the number of electrons N. Owing to the absence of intervalley spin-couplings, high-spin states are realized more often in small magnetic fields, than in GaAs quantum dots. In much larger dots, electrons are accommodated in a valley, making the highest spin of S = N/2, to gain the exchange energy.
|ジャーナル||Physica E: Low-Dimensional Systems and Nanostructures|
|出版ステータス||Published - 2003 4月|
|イベント||Proceedings pf the International Conference on Superlattices - ICSNN 2002 - Touluse, France|
継続期間: 2002 7月 22 → 2002 7月 26
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