Coulomb-interaction-induced incomplete shell filling in the hole system of InAs quantum dots.
We have studied the hole charging spectra of self-assembled InAs quantum dots in perpendicular magnetic fields by capacitance-voltage spectroscopy. From the magnetic-field dependence of the individual peaks we conclude that the s-like ground state is completely filled with two holes but that the fourfold degenerate p shell is only half filled with two holes before the filling of the d shell starts. The resulting six-hole ground state is highly polarized. This incomplete shell filling can be explained by the large influence of the Coulomb interaction in this system.
Reuter
D
D
Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44799 Bochum, Germany.
Kailuweit
P
P
Wieck
A D
AD
Zeitler
U
U
Wibbelhoff
O
O
Meier
C
C
Lorke
A
A
Maan
J C
JC