Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-01-28
Superlattices and Microstructures, Vol. 34, Issues 3-6, p. 159 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
PDF file only. 10 pages, 3 figures. In press on Superlattices and Microstructures. Proceedings of 6-th International Conferenc
Scientific paper
10.1016/j.spmi.2004.03.003
Molecular states in a SINGLE PAIR of strongly coupled self-assembled InAs quantum dots are investigated using a sub-micron sized single electron transistor containing just a few pairs of coupled InAs dots embedded in a GaAs matrix. We observe a series of well-formed Coulomb diamonds with charging energy of less than 5 meV, which are much smaller than those reported previously. This is because electrons are occupied in molecular states, which are spread over both dots and occupy a large volume. In the measurement of ground and excited state single electron transport spectra with magnetic field, we find that the electrons are sequentially trapped in symmetric and anti-symmetric states. This result is well-explained by numerical calculation using an exact diagonalization method.
Hatano Takafumi
Miyazawa Takeshi
Nakata Yoshifumi
Ohshima Takayoshi
Ota Toshihiko
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