arXiv subjects

Sara Safa

Publications and source records attributed to Sara Safa.

3 recordsLinked to original sources

arXiv2015

Vertical transport in InAs/GaSb superlattice: role of ionized impurity and interface roughness scatterings

We report on the vertical electron mobility versus temperature by applying the interface roughness scattering and ionized impurity scattering in InAs/GaSb superlattices. Using the Finite difference K.P method, we calculated the band structure of InAs/Gasb superlattices and then studied the transport properties of these systems. Several structural parameters such as layer thicknesses, interface roughness height, correlation length and ion density have been investigated and characterized that how the vertical mobility change with varying these parameters. Theoretical modeling results show that these two scattering mechanism are important in lower temperatures and thin layer systems.

cond-mat.mtrl-sci↗

arXiv2015

Role of Ionized Impurity and Interface Roughness Scatterings in the Electronic Transport of InAs/GaSb Type II Superlattices at Low Temperatures

The in-plane electron mobility has been calculated in InAs/GaSb type-II superlattices at low temperatures. The interface roughness scattering and ionized impurity scattering are investigated as the dominant scattering mechanisms in limiting the electron transport at low temperatures. For this purpose, the band structures and wave functions of electrons in such superlattices are calculated by solving the K.P Hamiltonian using the numerical Finite Difference method. The scattering rates have obtained for different temperatures and structural parameters. We show that the scattering rates are high in thin-layer superlattices and the mobility rises as the temperature increases in low-temperature regime.

cond-mat.mtrl-sci↗

arXiv2015

Study of the Electron Mobility in InAs/GaSb Type II Superlattices at High Temperatures

In this paper, we present a study of the effects of temperature on the electron mobility in InAs/GaSb type-II superlattices (SLs) in which the band structures and wave functions are calculated by solving the K.P Hamiltonian using the numerical Finite Difference method. In the model the dominant scattering mechanisms such as alloy scattering, acoustic phonon scattering and optical phonon scattering are taken into account. The obtained electron mobility of the type II SLs is depended on the structural parameters and different scattering parameters. A comparison of our calculated results with published experimental data is shown to be in good agreement.

cond-mat.mtrl-sci↗