D. G. Polyakov

Cyclotron-resonance harmonics in the ac response of a 2D electron gas with smooth disorder.

The frequency-dependent conductivity

Nonequilibrium phenomena in high Landau levels

\sigma_{xx}(\omega)

Strong Magnetoresistance Induced by Long-Range Disorder

of 2D electrons subjected to a transverse magnetic field and smooth disorder is calculated. The interplay of Landau quantization and disorder scattering gives rise to an oscillatory structure that survives in the high-temperature limit. The relation to recent experiments on photoconductivity by Zudov {\it et al.} and Mani {\it et al.} is discussed.

Quasiclassical magnetotransport in a random array of antidots

Developments in the physics of 2D electron systems during the last decade have revealed a new class of nonequilibrium phenomena in the presence of a moderately strong magnetic field. The hallmark of these phenomena is magnetoresistance oscillations generated by the external forces that drive the electron system out of equilibrium. The rich set of dramatic phenomena of this kind, discovered in high mobility semiconductor nanostructures, includes, in particular, microwave radiation-induced resistance oscillations and zero-resistance states, as well as Hall field-induced resistance oscillations and associated zero-differential resistance states. We review the experimental manifestations of these phenomena and the unified theoretical framework for describing them in terms of a quantum kinetic equation. The survey contains also a thorough discussion of the magnetotransport properties of 2D electrons in the linear response regime, as well as an outlook on future directions, including related nonequilibrium phenomena in other 2D electron systems.

Quasiclassical negative magnetoresistance of a 2D electron gas: interplay of strong scatterers and smooth disorder.

We calculate the semiclassical magnetoresistivity

Mechanisms of the microwave photoconductivity in two-dimensional electron systems with mixed disorder

{\ensuremath{\rho}}_{\mathrm{xx}}(B)

Theory of fractional microwave-induced resistance oscillations.

of noninteracting fermions in two dimensions moving in a weak and smoothly varying random potential or random magnetic field. We demonstrate that in a broad range of magnetic fields the non-Markovian character of the transport leads to a strong positive magnetoresistance. The effect is especially pronounced in the case of a random magnetic field where

Oscillatory ac conductivity and photoconductivity of a two-dimensional electron gas: Quasiclassical transport beyond the Boltzmann equation

{\ensuremath{\rho}}_{\mathrm{xx}}(B)

Compressibility of a two-dimensional electron gas under microwave radiation

becomes parametrically much larger than its

Dephasing and weak localization in disordered Luttinger liquid.

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