Raja N. Mir | Searcharxiv

arXiv2019

Electron Transport Through 2D Waveguide Using QTBM

Simulation of Electron Transport through two dimensional(2D) waveguide using Quantum Transport Boundary Method (QTBM) is done. Specifically, as an example the results of modeling L-shaped contact for a rectangular waveguide are presented. 2D-QTBM approach can be used in any scenario where the vertical axis of the device structure is significantly large and therefore the 2D approximation would be considered valid. This method elegantly generalizes to arbitrary shaped waveguides.

cond-mat.mes-hall↗

arXiv2015

Simple remedy for spurious states in discrete k(dot)p models of semiconductor structures

The spurious states found in numerical implementations of envelope function models for semiconductor heterostructures and nanostructures are artifacts of the use of the centered-difference formula. They are readily removed by employing a first-order difference scheme. The technique produces none of the loss of accuracy that is commonly feared from lower-order formulations; the fidelity to the continuum band structure is actually improved. Moreover the stability is absolute, thus no adjustments to the model parameters are required. These properties are demonstrated in an explicit calculation of a 3-band model of a semiconductor superlattice.

cond-mat.mes-hall↗