From zero resistance states to absolute negative conductivity in microwave irradiated 2D el.pdf
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From zero resistance states to absolute negative conductivity in microwave irradiated 2D el
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From zero resistance states to absolute negative conductivity in microwave irradiated
2D electron systems
J. In?arrea1,2 and G. Platero1
1Instituto de Ciencia de Materiales, CSIC, Cantoblanco, Madrid, 28049, Spain
2Escuela Polite?cnica Superior, Universidad Carlos III, Leganes, Madrid, 28911, Spain
(Dated: February 6, 2008)
Recent experimental results regarding a 2D electron gas subjected to microwave radiation reveal
that magnetoresistivity, apart from presenting oscillations and zero resistance states, can evolve to
negative values at minima. In other words, the current can evolve from flowing with no dissipation,
to flow in the opposite direction of the dc bias applied. Here we present a theoretical model in
which the existence of radiation-induced absolute negative conductivity is analyzed. Our model
explains the transition from zero resistance states to absolute negative conductivity in terms of
multiphoton assisted electron scattering due to charged impurities and shows how this transition
can be driven by tuning microwave frequency and intensity. This opens the possibility of controlling
the magnetoconductivity in microwave driven nanodevices and understanding the novel optical and
transport properties of such devices.
PACS numbers:
The effect of an AC field on the electronic transport
properties of nanostructures has been an active research
topic in the last years. One reason for this is that the AC
field can profoundly modify the electronic structure and
the dynamical properties of electrons in the nanostruc-
ture. The application of an external AC potential also
allows the electronic properties to be tuned in a con-
trollable way1,2. Ten years ago, transport experiments
on AC-driven weakly coupled semiconductors superlat-
tices reveled a fascinating, non-intuitive, behavior: for
certain parameters of the AC potential and stationary
electric field,
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