Effective mass (solid-state physics)

About: Effective mass (solid-state physics) is a research topic. Over the lifetime, 12539 publications have been published within this topic receiving 295485 citations.

k→⋅p→ theory, effective-mass approach, and spin splitting for two-dimensional electrons in GaAs-GaAlAs heterostructures

Abstract: A five-level k\ensuremath{\rightarrow}\ensuremath{\cdot}p\ensuremath{\rightarrow} theory is developed for conduction-band electrons in heterostructures. A local effective mass and a local g factor are obtained which depend on the variation of the p-type valence- and higher conduction-band edges. The effective mass and the spin splitting found in cyclotron and spin-resonance experiments are explained. A finite spin splitting is obtained at zero magnetic field and the possibility of determining the interface discontinuity from the spin splitting is discussed.

Effect of Disorder on the Conduction-Band Effective Mass, Valence-Band Spin-Orbit Splitting, and the Direct Band Gap in III-V Alloys

Abstract: The conduction-band effective mass in small-band-gap III-V alloys has been observed to be heavier than would be expected from a standard $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}\ifmmode\cdot\else\textperiodcentered\fi{}\stackrel{\ensuremath{\rightarrow}}{\mathrm{p}}$ calculation in the virtual-crystal approximation. Here we analyze the effect of disorder-induced valence-conduction band mixing on this effective mass. It is found that with a consistent set of assumptions for interband and intraband mixing, one can account for the variation of the band gap, the spin-orbit splitting, and the conduction-band mass in these alloys.

Confinement and phase transitions

Abstract: Using a density dependent quark mass to express non-perturbative interaction effects, we calculate the critical density for a phase transition between nuclear and quark matter atT=0.

Doping mechanism in aluminum doped zinc oxide films

Abstract: The doping mechanism in aluminum doped zinc oxide films has been interpreted by considering the relationship between Hall mobility and effective mass of electrons with carrier concentrations. Both degeneracy and the nonparabolic nature of the conduction band are taken into account for determining the charge state of the dopant. It is ascertained that aluminum liberates one free carrier in the zinc oxide lattice by substituting the zinc atom.

Anisotropy of the Ginzburg-Landau parameter κ in NbSe 2

Abstract: On small single crystals of 2H NbSe 2 we have measured the temperature and angular dependence ofH c2 as well as the temperature dependence ofH c1 close toT c. Using an effective mass approach to the Ginzburg-Landau equations we have analyzed our data in terms of an anisotropic κ and obtained values for the coherence distances and penetration depths parallel and perpendicular to the layers. The connection between these parameters and normal-state properties is discussed and shown to be more complex than in the isotropic case.