Electron correlation and charge transfer instability in bilayered two-dimensional electron gas

Charge and spin dynamics in a two-dimensional electron gas.

A number of time-resolved optical experiments probing and controlling the spin and charge dynamics of the high-mobility two-dimensional electron gas in a GaAs/AlGaAs heterojunction are discussed. These include time-resolved reflectivity, luminescence, transient grating, magneto-optical Kerr effect, and electro-optical Kerr effect experiments. The optical experiments provide information on the c...

Spin-charge coupling effects in a two-dimensional electron gas

In these lecture notes we study the disordered two-dimensional electron gas in the presence of Rashba spin-orbit coupling, by using the Keldysh nonequilibrium Green function technique. We describe the effects of the spin-orbit coupling in terms of a SU(2) gauge field and derive a generalized Boltzmann equation for the charge and spin distribution functions. We then apply the formalism to discus...

Electron correlation and charge transfer at the NiÕCo interface

The evolving magnetism and electronic structure at the Ni/Co interface have been studied using x-ray absorption spectroscopy ~XAS! and x-ray photoemission spectroscopy ~XPS! with circularly polarized x rays. Deposition of ultrathin Ni films on thin films of Co grown on Cu~001! results in an intensity enhancement across the Co L2.3 absorption edge. By comparison, the intensity of the Ni L2.3 edg...

Two-dimensional electron gas near full polarization

We establish the consistency of the Fermi liquid description and find a relation between the Fermi liquid constants for a two-dimensional electron system near the point of full polarization due to a parallel magnetic field H. Our results enable us to predict connections between different thermodynamic properties of the system. In particular, we find that near the point of full polarization Hc ,...

Two dimensional electron gas at oxide interfaces