Physikalisch-Technische Bundesanstalt

Quantum systems of electrons in two dimensions show in a strong transverse magnetic field an astonishing variety in their physical behaviors as the density of charge carriers (or the magnetic field) and the disorder are varied. We are investigating theoretically the following topics:

• graphene - Dirac approximation
  symmetries and disorder in the system
  density of states
  conductivity tensor            

• fractional quantum-Hall-effect
  influence of finite temperature, electron-spin
  Collaboration with Dr. Sivinee Sawatdiaree, NMI Bangkok

• filling factor 1, "Skyrmions" in Quantum Hall systems
  effective field theory, nature of the elementary excitations, spin relaxation
  Collaboration with Prof. Dr. Yu. A. Bychkov (L.D. Landau Institute, Moscow, Russia)
  There are methodical relations to the theory of the Heisenberg-antiferromagnet in two dimensions.
  Collaboration with Prof. Dr. H. U. Everts (Universität Hannover, Germany)

List of publications

Senior Scientist
PD Dr. Walter Apel
Tel.: 0531-592-8122
E-Mail: walter.apel@ptb.de
 
 
Address
Physikalisch-Technische Bundesanstalt
Fachbereich PSt 4
Bundesallee 100
D-38116 Braunschweig