Magnetoresistance results are presented for p-SiGe samples on the metallic side of the B=0 metal-insulator transition. It was possible to separate the weak localization and Zeeman interaction effects but the results could not be explained quantitatively within the framework of standard theories for quantum corrections of a weakly interacting two-dimensional system. Analysis using a theory for interaction corrections at intermediate temperatures, recently proposed by Zala, Narozhny, and Aleiner provided values of the Fermi-liquid parameter Fσ0 of order -0.5. Similar values also explain the linear increase of resistance with temperature characteristic of the metallic phase.
Physical Review B
- Pub Date:
- March 2002
- Metal-insulator transitions and other electronic transitions;
- Conductivity phenomena in semiconductors and insulators;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems