Temperature dependence of microwave-induced magnetoresistance oscillation in two-dimensional electron systems

2009 ◽  
Vol 94 (23) ◽  
pp. 232107 ◽  
Author(s):  
X. L. Lei ◽  
S. Y. Liu
Keyword(s):  
Temperature Dependence ◽  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Magnetoresistance Oscillation ◽  
Two Dimensional Electron Systems

MAGNETIC FIELD INDUCED INSTABILITIES IN LOCALIZED TWO-DIMENSIONAL ELECTRON SYSTEMS

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2708-2712
Author(s):  
MATTHIAS BAENNINGER ◽  
ARINDAM GHOSH ◽  
MICHAEL PEPPER ◽  
HARVEY E. BEERE ◽  
IAN FARRER ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Fields ◽  
Temperature Dependence ◽  
Electron Density ◽  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Transport Studies ◽  
Two Dimensional Electron Systems

The results of extensive transport studies in localized regime of mesoscopic two-dimensional electron systems (2DES) with varying disorder are presented. A quick overview of previously achieved result is given. The main focus is on the observation of density dependent instabilities manifested by strong resistance oscillations induced by high perpendicular magnetic fields B⊥. While the amplitude of the oscillations is strongly enhanced with increasing B⊥, their position in electron density remains unaffected. The temperature dependence of resistivity shows a transition from an activated behaviour at high temperature to a saturated behaviour at low T. In the positions of resistance minima, the T dependence can even become metal-like (dρ/dT > 0). The activation energies obtained from the high T behaviour exhibit a formation of plateaux in connection with the resistance oscillations when analyzed as a function of electron density. We suggest the interplay between a strongly interacting electron phase and the background disorder as a possible explanation for our observation.

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