Spin transitions in a small Si quantum dot

Abstract

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.

Revtex, 5 pages, 3 figures

References in corpus (4)

• A Tunable Kondo Effect in Quantum Dots
• The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy
• Spin splitting and even-odd effects in carbon nanotubes
• Double-dot charge transport in Si single electron/hole transistors

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