Three- versus Two-Dimensional Electron Gas Injection in Resonant Tunnelling

Tunnelling between two-dimensional electron gases up to 25 T

We have measured the tunnelling between 2 two-dimensional electron gases at magnetic fields B up to 25 T. When the carrier densities of the two electron layers are matched and for filling factors v < 1, we observe a clear gap in the differential conductance dI/d V as a function of the voltage Vsd applied between the layers. We have measured tunnelling peak positions and fitted gap parameters d ...

Spin injection efficiency from two adjoining ferromagnetic metals into a two-dimensional electron gas

In order to enhance spin injection efficiency from ferromagnetic (FM) metal into a two-dimensional electron gas (2DEG), we introduce another FM metal and two tunnel barriers (I) between them to investigate the current polarization in such ballistic FM/I/FM/I/2DEG junction. Our treatment is based on the free-electron scattering theory. It is found that due to quantum interference effect, the mag...

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 ,...

Interband resonant transitions in two-dimensional hexagonal lattices: Rabi oscillations, Zener tunnelling, and tunnelling of phase dislocations.

We study, analytically and numerically, the dynamics of interband transitions in two-dimensional hexagonal periodic photonic lattices. We develop an analytical approach employing the Bragg resonances of different types and derive the effective multi-level models of the Landau-Zener-Majorana type. For two-dimensional periodic potentials without a tilt, we demonstrate the possibility of the Rabi ...

Two dimensional electron gas at oxide interfaces