Spin transitions in a small Si quantum dot

Details Spin transitions in a small Si quantum dot Spin transitions in a small Si quantum dot

2000-05-16

arxiv.org/abs/cond-mat/0005262v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revtex, 5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.63.035321

We have studied the magnetic field dependence of the ground state energies in a small Si quantum dot. At low fields the first five electrons are added in a spin-up -- spin-down sequence minimizing the total spin. This sequence does not hold for larger number of electrons in the dot. At high fields the dot undergoes transitions between states with different spins driven entirely by Zeeman energy. We identify some features that can be attributed to transitions between different spin configurations preserving the total spin of the dot. For a few peaks we observed large linear shifts that correspond to the change of the spin of the dot by 3/2. Such a change requires that an electron in the dot flips its spin during every tunneling event.

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