Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-02-06
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Proceedings of ICPS-25 conference
Scientific paper
We investigated electron transport through ultra small Si quantum dots. We found that 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. In some dots the number of electrons N in the dot can be tuned starting from zero, and the total spin of the dot can be mapped as a function of N and B. For one of the dots we deduced that the dot becomes spontaneously polarized at N=6 with a large spin change \Delta S=3/2, demonstrating the essential features of spin blockade. Surprisingly, for N>20, the transitions with \Delta S>1/2 do not lead to the suppression of the corresponding peaks at low temperatures.
Chou Stephen Y.
Guo Jay L.
Rokhinson Leonid P.
Tsui Daniel C.
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