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Multivalley effect on electronic states in Si quantum dots

✍ Scribed by Yoko Hada; Mikio Eto

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
84 KB
Volume
17
Category
Article
ISSN
1386-9477

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✦ Synopsis

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 ÿlled 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 ÿelds, 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.

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