IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Nanometer Structures Thursday Sessions
       Session NS-ThA

Invited Paper NS-ThA7
Probing the Dependence of the Spin Splitting in Quantum Dots on Residual Disorder

Thursday, November 1, 2001, 4:00 pm, Room 133

Session: Quantum Dots & Single Electronics
Presenter: M. Morgenstern, Hamburg University, Germany
Authors: M. Morgenstern, Hamburg University, Germany
V. Gudmundsson, Science-Institute, Iceland
R. Wiesendanger, Hamburg University, Germany
Correspondent: Click to Email
A scanning tunneling microscope is used to induce a quantum dot into the InAs(110) surface. This quantum dot provides the unique possibility to be moved in a controlled manner across the surface. Thus charged impurities of the substrate are positionable in the quantum dot area (diameter 100 nm). Working at low temperatures (6 K) in magnetic field (6 T) allows to detect the energies of the spin split states corresponding to different Landau indices. While the state energies closely follow the disorder potential in the quantum dot, the energy difference between spin split states does not. From comparison with detailed Hartree-Fock calculations we conclude that this behaviour is directly guided by the non-local character of the exchange-interaction.