| Issue |
Europhys. Lett.
Volume 36, Number 3, October III 1996
|
|
|---|---|---|
| Page(s) | 197 - 202 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00210-x | |
| Published online | 01 September 2002 | |
Shell structure and electron-electron interaction in self-assembled InAs quantum dots
1
Sektion Physik, LMU München - Geschwister-Scholl-Platz 1,
80539 München, Germany
2
Materials Department and QUEST, University of California, Santa
Barbara, CA 93117, USA
Received:
12
July
1996
Accepted:
12
September
1996
Using far-infrared spectroscopy, we investigate the excitations of
self-organized InAs quantum dots as a function of the electron number per
dot, 
, which is monitored in situ by capacitance
spectroscopy. Whereas the well-known two-mode spectrum is observed when the
lowest (s-) states are filled, we find a rich excitation spectrum for
, which reflects the importance of electron-electron interaction
in the present, strongly non-parabolic confining potential.
From capacitance spectroscopy we find that the electronic shell structure
in our dots gives rise to a distinct pattern in the charging energies which
strongly deviates from the monotonic behavior of the Coulomb blockade found
in mesoscopic or metallic structures.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 78.30.Fs – III-V and II-VI semiconductors / 78.66.Fd – III-V semiconductors
© EDP Sciences, 1996
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