Numerical solution of multiband k.p model for tunnelling in type-II heterostructures
South African Journal of Science
| Field | Value | |
| Title | Numerical solution of multiband k.p model for tunnelling in type-II heterostructures | |
| Creator | Botha, A.E. | |
| Description | A new and very general method was developed for calculating the charge and spin-resolved electron tunnelling in type-II heterojunctions. Starting from a multiband k.p description of the bulk energy-band structure, a multiband k.p Riccati equation was derived. The reflection and transmission coefficients were obtained for each channel by integrating the Riccati equation over the entire heterostructure. Numerical instability was reduced through this method, in which the multichannel log-derivative of the envelope function matrix, rather than the envelope function itself, was propagated. As an example, a six-band k.p Hamiltonian was used to calculate the current-voltage characteristics of a 10-nm wide InAs/ GaSb/InAs single quantum well device which exhibited negative differential resistance at room temperature. The calculated current as a function of applied (bias) voltage was found to be in semiquantitative agreement with the experiment, a result which indicated that inelastic transport mechanisms do not contribute significantly to the valley currents measured in this particular device. | |
| Publisher | AOSIS | |
| Date | 2010-01-19 | |
| Identifier | 10.4102/sajs.v105i7/8.83 | |
| Source | South African Journal of Science; Vol 105, No 7/8 (2009); 294 1996-7489 0038-2353 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://journals.sajs.aosis.co.za/index.php/sajs/article/view/83/64
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