Changes in the Magnetization of a Double Quantum Dot

Details Changes in the Magnetization of a Double Quantum Dot Changes in the Magnetization of a Double Quantum Dot

1998-02-11

arxiv.org/abs/cond-mat/9802118v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, plus 3 figures

Scientific paper

10.1103/PhysRevLett.80.4951

From accurate measurements of the energy states in a double quantum dot we deduce the change in magnetization due to single electron tunneling. As a function of magnetic field we observe crossings and anti-crossings in the energy spectrum. The change in magnetization exhibits wiggles as a function of magnetic field with maximum values of a few effective Bohr magnetons in GaAs. These wiggles are a measure of the chaotic motion of the discrete energy states versus magnetic field. Our results show good agreement with a numeric calculation but deviate significantly from semiclassical estimates.

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