Research Interests

My research is on two dimensional electron system (2DES) in semiconductor micro- and nano-structures. I have focused my attention on the effects of the electron-electron interaction on the ground state and excited states of the 2DES in an external magnetic field at low temperature. I have worked on the following problems:

• Screening of long range potential fluctuations in a confined 2DES. Effects on equilibrium properties.
• Quantum dots, ground state properties and FIR absorption.
• Screening of impurities in small systems. Ground state properties and FIR absorption.
• Spin inversion states in small systems.
• Effects of screening on the Hofstadter energy spectrum in a periodically modulated 2DES.
• 2DES in a periodically modulated magnetic field.
• Magnetization of mesoscopic electronic systems.
• Memory and hysteresis effects caused by the exchange interaction of electrons.
• Non-linear excitation of electronic systems in semiconductors on the nano scale by THz radiation pulses.
• Transport through quantum wires with embedded quantum dots and rings with and without an external magnetic field.

Most of the work has been carried out in close cooperation with experimental groups and can be categorized as modelling of electronic systems somwhere between theoretical and applied physics. Many projects have resulted in heavy numerical work.

The research has been supported by:

• The Research Fund of the Icelandic state
• The University of Iceland Research Fund
• NorFA
• NATO Science Foundation

Einfaldir textar á íslensku um rannsóknirnar:

• Lotubundin rafeindakerfi í tvívíðum hálfleiðurum.
• Leiðni nanórafeindakerfa í hálfleiðurum.