Electron Transport and Terahertz Gain in Quantum-Dot Cascades

Electron transport through quantum-dot (QD) cascades was investigated using the formalism of nonequilibrium Green's functions within the self-consistent Born approximation. Polar coupling to optical phonons, deformation potential coupling to acoustic phonons, as well as anharmonic decay of long...

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Bibliographic Details
Published in:IEEE photonics technology letters 2008-01, Vol.20 (2), p.129-131
Main Authors: Vukmirovic, N., Indjin, D., Ikonic, Z., Harrison, P.
Format: Article
Language:English
Subjects:
Approximation methods
Cascades
Current density
Deformable models
Electron optics
Electron transport
Green's function methods
Joining
Optical coupling
Optical design
Phonons
Quantum cascade lasers
Quantum dots
quantum dots (QDs)
quantum-cascade lasers (QCLs)
Scattering
Simulation
terahertz
Terahertz frequencies
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Summary:Electron transport through quantum-dot (QD) cascades was investigated using the formalism of nonequilibrium Green's functions within the self-consistent Born approximation. Polar coupling to optical phonons, deformation potential coupling to acoustic phonons, as well as anharmonic decay of longitudinal optical phonons were included in the simulation. A QD cascade laser structure comprising two QDs per period was designed and its characteristics were simulated. Significant values of population inversion enabling lasing in the terahertz frequency range were predicted, with operating current densities being more than an order of magnitude smaller than in existing terahertz quantum-well-based quantum-cascade lasers.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2007.912533