Optical properties of a tip-induced quantum dot.

Authors :: Kemerink, M.
Sauthoff, K.
Koenraad, P.M.
Gerritsen, J.W.
van Kempen, H.
Fomin, V.M.
Wolter, J.H.
Devreese, J.T.
Source :: Applied Physics A: Materials Science & Processing; 2001, Vol. 72 Issue 8, pS239, 4p
Publication Year :: 2001
Abstract: Abstract. We have performed optical spectroscopy measurements on a STM-tip-induced quantum dot in a GaAs layer. The dominant confinement in the (hole) quantum dot is found to be in the direction parallel to the tip axis. Electron confinement is achieved by a sub-surface AlGaAs barrier. Currentdependent measurements indicate that many-body interactions can cause spectral blueshifts up to 75 meV for a tunneling current of 10 nA. Consequently, a full treatment of the many-body problem is required for an accurate description of this type of system. [ABSTRACT FROM AUTHOR]