TY - JOUR
T1 - Molecular states observed in a single pair of strongly coupled self-assembled InAs quantum dots
AU - Ota, T.
AU - Stopa, M.
AU - Rontani, M.
AU - Hatano, T.
AU - Yamada, K.
AU - Tarucha, S.
AU - Song, H. Z.
AU - Nakata, Y.
AU - Miyazawa, T.
AU - Ohshima, T.
AU - Yokoyama, N.
N1 - Funding Information:
The authors thank K. Ono, S. Amaha and T. Sato for valuable discussions. The authors acknowledge financial support from a Grant-in-Aid for Scientific Research A (No. 40302799), SORST-JST, Focused Research and Development Project for the Realization of the World’s Most Advanced IT Nation, IT program, MEXT and MIUR-FIRB “Quantum phases…”, INFM I.T. Calcolo Parallelo 2003, and the Italian Ministry for Foreign Affairs, DGPCC.
PY - 2003/9
Y1 - 2003/9
N2 - 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 a 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.
AB - 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 a 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.
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U2 - 10.1016/j.spmi.2004.03.003
DO - 10.1016/j.spmi.2004.03.003
M3 - Article
AN - SCOPUS:3242670872
SN - 0749-6036
VL - 34
SP - 159
EP - 164
JO - Superlattices and Microstructures
JF - Superlattices and Microstructures
IS - 3-6
ER -