Spin transitions in a small Si quantum dot

L. P. Rokhinson, L. J. Guo, S. Y. Chou, D. C. Tsui

Research output: Contribution to journalArticle

67 Scopus citations

Abstract

We investigated electron transport through an ultrasmall Si quantum dot. The B dependence of energy levels is dominated by the Zeeman shift, allowing us to measure the spin difference between two successive ground states directly. Combined with the ability to change the number of electrons N in the dot between 0 and 30, we are able to map the spin of the dot as a function of N and B. The dot becomes spontaneously polarized at N = 6 with a large spin change Δ S = 3/2, demonstrating the essential features of spin blockade. Surprisingly, for N > 20, the transitions with Δ S >1/2 do not lead to the suppression of the corresponding peaks at low temperatures.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number3
DOIs
StatePublished - Jan 2 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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