On the Nature of Charge Transport in Quantum-Cascade Lasers

Details On the Nature of Charge Transport in Quantum-Cascade Lasers On the Nature of Charge Transport in Quantum-Cascade Lasers

2001-08-21

arxiv.org/abs/cond-mat/0108335v1

Physics

Condensed Matter

4 pages, 7 Postscript figures. Phys. Rev. Lett. (in press)

Scientific paper

10.1103/PhysRevLett.87.146603

The first global quantum simulation of semiconductor-based quantum-cascade lasers is presented. Our three-dimensional approach allows to study in a purely microscopic way the current-voltage characteristics of state-of-the-art unipolar nanostructures, and therefore to answer the long-standing controversial question: is charge transport in quantum-cascade lasers mainly coherent or incoherent? Our analysis shows that: (i) Quantum corrections to the semiclassical scenario are minor; (ii) Inclusion of carrier-phonon and carrier-carrier scattering gives excellent agreement with experimental results.

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