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I'm currently working on the measurement of energy levels of a vertical quantum dot, using
a technique developed by our group called single electron capacitance spectroscopy (SECS).
The quantum dot system that we studied can be made to contain as few as one electron. By measuring
the energy required for additional number of electrons to enter the dot, we can map out the
energy spectrum of the dot (or "artificial atoms"). This allows us to study, in great details, the
electron-electron interaction and many body effects in this system.
The approach to quantum confinement of ours differs from most other
quantum dot groups in that we work with vertical dots, in stead of lateral ones.
Specifically, I'm trying to make a vertical single quantum dot and study the ferromagnetic-
antiferromagnetic transition of the top level electron spins.
The picture at the upper left corner is a image of one practice sample, using E-beam lithography.
More details to come soon.
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