Correlation effects in wave function mapping of molecular beam epitaxy grown quantum dots.
We investigate correlation effects in the regime of a few electrons in uncapped InAs quantum dots by tunneling spectroscopy and wave function (WF) mapping at high tunneling currents where electron-electron interactions become relevant. Four clearly resolved states are found, whose approximate symmetries are roughly s and p, in order of increasing energy. Because the major axes of the p-like states coincide, the WF sequence is inconsistent with the imaging of independent-electron orbitals. The results are explained in terms of many-body tunneling theory, by comparing measured maps with those calculated by taking correlation effects into account.
Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany. giuseppe.maruccio@unile.it; rontani@unimore.it
Giuseppe
G
Maruccio
Martin
M
Janson
Andreas
A
Schramm
Christian
C
Meyer
Tomohiro
T
Matsui
Christian
C
Heyn
Wolfgang
W
Hansen
Roland
R
Wiesendanger
Massimo
M
Rontani
Elisa
E
Molinari
D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D004579:Electron Transport; D008422:Materials Testing; D008962:Models, Theoretical; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D045663:Quantum Dots; D013223:Statistics as Topic