Spin Polarization Dependence of Carrier Effective Mass in Semiconductor Structures: Spintronic Effective Mass

The structural dependence of the effective mass and Luttinger parameters in semiconductor quantum wells

The dependence of the Composite Fermion effective mass on carrier density and Zeeman energy

Measurements of the temperature-dependent resistivity of high-mobility GaAs/GaAlAs heterojunctions are used to measure the effective mass of Composite Fermions (CF). The CF effective mass is found to increase approximately linearly with the effective field B∗ up to effective fields of 14 T. Data from all fractions around ν = 1/2 are unified by the single parameter B∗ for samples studied over a ...

Dependence of effective mass on spin and valley degrees of freedom.

We measure the effective mass (m) of interacting two-dimensional electrons confined to an AlAs quantum well while we change the conduction-band valley occupation and the spin polarization via the application of strain and magnetic field, respectively. Compared to its band value, m is enhanced unless the electrons are fully valley- and spin-polarized. Incidentally, in the fully spin- and valley-...

Spin-valley filtering in strained graphene structures with artificially induced carrier mass and spin-orbit coupling.

The interplay of massive electrons with spin-orbit coupling in bulk graphene results in a spin-valley dependent gap. Thus, a barrier with such properties can act as a filter, transmitting only opposite spins from opposite valleys. In this Letter we show that a strain induced pseudomagnetic field in such a barrier will enforce opposite cyclotron trajectories for the filtered valleys, leading to ...

Excitons with anisotropic effective mass

We present a simple analytic scheme for calculating the binding energy of excitons in semiconductors that takes full account of the existing anisotropy in the effective mass, as a complement to the qualitative treatment in most textbooks. Results obtained for excitons in gallium nitride form the basis for a discussion of the accuracy of this approach. Zusammenfassung. Wir präsentieren ein einfa...