Volume 127, Number 5, September 2019
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 October 2019|
Effect of current-induced electron heating on irradiated magnetoresistance in high-mobility 2D electron systems
Escuela Politecnica Superior, Universidad Carlos III de Madrid - Madrid, 28911, Spain and Unidad Asociada al Instituto de Ciencia de Materiales, CSIC - Cantoblanco, Madrid, 28049, Spain
Received: 14 June 2019
Accepted: 25 August 2019
We present a theoretical work to study the influence of an external DC-current on the irradiated magnetoresistance through a very high-mobility 2D electron system. Recent experiments report that an increasing DC-current through the system under radiation, dramatically reduces magnetoresistance, including background and irradiated contributions. On the one hand, the former ends up progressively negative (negative giant magnetoresistance) and on the other hand, the effect of radiation, i.e., the radiation-induced resistance oscillations, tends to vanish. In our theoretical model, the DC-current–induced hot electrons when scattered by charged impurities end up, to an increasing extent, between Landau levels with a very low density of states to get to. This makes the scattering process much less effective, decreasing both the magnetoresistance itself and the radiation-induced resistance oscillations. We conclude that both effects are not separable, being tightly linked by the scattering process.
PACS: 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 75.75.-c – Magnetic properties of nanostructures
© EPLA, 2019
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