Nonlinear response formula for an interacting two-dimensional electron gas under a magnetic field and microwave radiation

Compressibility of a two-dimensional electron gas under microwave radiation

M. G. Vavilov,1 I. A. Dmitriev,2,* I. L. Aleiner,3 A. D. Mirlin,2,4,† and D. G. Polyakov2,* 1Center for Materials Sciences and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 2Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany 3Physics Department, Columbia University, New York, New York 10027, USA 4Institut für Theorie der...

Non-uniform two-dimensional electron gas in a magnetic field

Basic properties of a two-dimensional electron gas with spatially varying carrier concentration in external magnetic fields are reviewed. The two main problems: modification of galvanomagnetic coefficients due to random fluctuations of equilibrium concentration and the concentration gradient created by the Lorenz force in the Hall direction — are considered for weak, classically strong, and qua...

Nonlinear resistivity of a two-dimensional electron gas in a magnetic field

We develop a theory of nonlinear response to an electric field of a two-dimensional electron gas 2DEG placed in a classically strong magnetic field. The latter leads to a nonlinear current-voltage characteristic at a relatively weak electric field. The origin of the nonlinearity is twofold: the formation of a nonequilibrium electron distribution function and the geometrical resonance in the int...

Resistivity of a Disordered Two-dimensional Electron Gas under Magnetic Field

Phase-resolved nonlinear response of a two-dimensional electron gas under femtosecond intersubband excitation.

Strong electric-field transients resonant to intersubband transitions in n-type modulation-doped GaAs/AlGaAs quantum wells induce coherent Rabi oscillations, which are demonstrated by a phase-resolved measurement of the light emitted by the sample. The time evolution of the intersubband polarization is influenced by Coulomb-mediated many-body effects. The subpicosecond period and the phase of t...