We analyze the structures emerging in the spacetime representation of the probability density woven by a slightly relativistic particle caught in a one-dimensional box. In particular, we evaluate the relativistic effects on the revival time and the specific changes produced in the intermode traces, which quantum carpets consist of. Moreover, we present a detailed mathematical analysis of such q...

Photoluminescence PL has been used as a means of unambiguously observing band gap reduction in InNAs epilayers grown by molecular beam epitaxy. The observed redshift in room temperature emission as a function of nitrogen concentration is in agreement with the predictions of the band anticrossing BAC model, as implemented with model parameters derived from tight-binding calculations. The tempera...

In order to study heterostructures composed both of materials with strongly different parameters and of materials with narrow band gaps, we have developed an approach @E. P. Pokatilov et al., Phys. Rev. B 64, 245328 ~2001!, preceding paper!#, which combines the spherical eight-band effective-mass Hamiltonian and the Burt’s envelope-function representation. Using this method, electron and hole s...

In order to study heterostructures composed both of materials with strongly different parameters and of materials with narrow band gaps, we have developed an approach [E. P. Pokatilov et al., Phys. Rev. B (the preceding article in the present issue)], which combines the spherical 8-band effectivemass Hamiltonian and the Burt’s envelope function representation. Using this method, electron and ho...

Hole mobility over a wide range of temperatures in pure Si and Ge is studied within the framework of effective mass theory using the Monte Carlo method. With this aim, we have implemented a three-band model (heavy, light, and split-off holes) introducing nonparabolicity even for the latter, which is usually considered parabolic in the literature. The warping in the heavy and light bands was tak...

We present a numerically efficient density-matrix model applicable to mid-infrared quantum cascade lasers. The is based on Markovian master equation for the density matrix that includes in-plane dynamics, preserves positivity of and does not rely phenomenologically introduced dephasing times. Nonparabolicity in band structure accounted with three-band $${\bf k}\cdot {\bf p}$$ model, which condu...

We have carried out saturation spectroscopy of cyclotron resonance in a semiconducting InAs/Al Ga Sb single quantum well using the UCSB free electron laser and have extracted an effective Landau level lifetime using an n-level rate equation model. The effective lifetime shows strong oscillations ('an order of magnitude) with frequency. Minima are shifted to higher frequencies than those given b...

Black phosphorus exhibits a high degree of band anisotropy. However, we find that its in-plane static screening remains relatively isotropic for momenta relevant to elastic long-range scattering processes. On the other hand, the collective electronic excitations in the system exhibit a strong anisotropy. Band nonparabolicity, due to interband couplings, leads to a plasmon frequency which scales...