Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-08
Phys. Rev. B 85, 045314 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 12 figures, and 1 table. Selected for an Editors' Suggestion in PRB and for a Viewpoint in Physics
Scientific paper
10.1103/PhysRevB.85.045314
We explore similarities between the quantum wells and quantum dots used as optical gain media in semiconductor lasers. We formulate a mapping procedure which allows a simpler, often analytical, description of quantum well lasers to study more complex lasers based on quantum dots. The key observation in relating the two classes of laser is that the influence of a finite capture time on the operation of quantum dot lasers can be approximated well by a suitable choice of the gain compression factor in quantum well lasers. Our findings are applied to the rate equations for both conventional (spin-unpolarized) and spin lasers in which spin-polarized carriers are injected optically or electrically. We distinguish two types of mapping that pertain to the steady-state and dynamical operation respectively and elucidate their limitations.
Gøthgen Christian
Lee Jeongsu
Oszwałdowski Rafał
Žutić Igor
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