Kinetic coefficients of two-dimensional electrons with strong Zeeman splitting
In modern nanostructures with very low defect densities, has recently been realized a hydrodynamic regime of electric transport, in which two-dimensional (2D) electrons form a viscous fluid due to frequent electron-electron collisions. Many bright transport phenomena have been observed in these systems. Of particular interest are two-component hydrodynamic electron systems, where a richer variety of phenomena becomes possible, than in one-component systems. A simplest way to implement and control a two-component 2D electron system is to place a structure with 2D electrons in a magnetic field with a large component in the 2D plane, that leads to a Zeeman splitting of the electron energy spectrum into two subbands. Here we develop a microscopic model of hydrodynamic transport in such system. By solving the kinetic equation, we calculate the electron-electron relaxation rates of the first and second angular harmonics of the two-component distribution function. Then we derive the hydrodynamic balance equations with the kinetic coefficient containing these rates. Namely, are taken into account the shear viscosity in each fluid component and the effect of the friction between the two components. The last leads to equalization of the hydrodynamic velocities in the two subbands. The obtained equations can be used to explain the results of puzzling magnetotransport experiments in ultra-pure nanostructures in a strong oblique magnetic field.