Effective mass and band nonparabolicity in remote doped Si/Si0.8Ge0.2 quantum wells

Electron effective mass and nonparabolicity in Ga0.47In0.53As/InP quantum wells.

The in-plane effective electron mass (m i) in narrow Ga0.47In0.53As/InP quantum wells is strongly dependent on the quantization energy. Cyclotron resonance in a series of quantum wells with well widths down to 15 Å reveals a mass enhancement of up to 50% (m i50.065m0) over the bulk value of Ga0.47In0.53As. This effect is caused by the nonparabolicity of the conduction band and wave function pen...

Hole effective mass in remote doped Si/Si12xGex quantum wells with 0.05<x<0.3

Nonparabolic band effects in GaAs/AlxGa1−xAs quantum dots and ultrathin quantum wells

We have investigated the optical properties of unstrained GaAs/AlxGa1−xAs quantum dot/well systems with the aim of studying the influence of confinement on the effective exciton mass, as determined from the photoluminescence line shift in high magnetic fields 50 T . The effective exciton mass is found to be more than twice the value for bulk GaAs. We attribute this to an enhanced nonparabolicit...

Composition dependence of the in-plane effective mass in lattice-mismatched, strained Ga1-xInxAs/InP single quantum wells

The composition dependence of the in-plane conduction band effective mass in strained 15nm-thick lattice-mismatched GatJn,As/InP single quantum wells was determined by conventional cyclotron and optically detected cyclotron resonance techniques. Our results are in agreement with a self-consistent calculation taking into account effects due to nonparabolicity, confinement, strain, and finite two...

Relaxation of quasi-two-dimensional electrons in a quantizing magnetic field probed by time-resolved cyclotron resonance

We have measured the picosecond time-resolved cyclotron resonance of photogenerated transient carriers in undoped InSb/Al0.09In0.91Sb quantum wells by two-color pump-probe spectroscopy in a magnetic field. The strong conduction-band nonparabolicity of InSb causes the average cyclotron mass of the electrons, which we monitor directly in time, to decrease as the electrons relax towards the band e...