Theoretical model for negative giant magnetoresistance in ultrahigh-mobility 2D electron systems
Escuela Politécnica Superior, Universidad Carlos III - Leganes, Madrid, 28911, Spain
Received: 13 February 2014
Accepted: 5 May 2014
We report on theoretical studies of the recently discovered negative giant magnetoresistance in ultraclean two-dimensional electron systems at low temperatures. We adapt a transport model to a ultraclean scenario and calculate the elastic scattering rate (electron-charged impurity) in a regime where the Landau level width is much smaller than the cyclotron energy. We obtain that for low magnetic fields the scattering rate and, as a consequence, the longitudinal magnetoresistance dramatically drop because of the small density of states between Landau levels. We also study the dependence of this striking effect on temperature and an in-plane magnetic field.
PACS: 73.40.-c – Electronic transport in interface structures / 73.50.-h – Electronic transport phenomena in thin films / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
© EPLA, 2014