Terahertz Lasing at Roomtemperature: Numerical Study of a Vertical-Emitting Quantum Cascade Laser Based on a Quantum Dot Superlattice

Abstract

We investigate room temperature lasing of terahertz quantum cascade lasers using quantum dot chains as active material suitable for wireless communication and imaging technologies. Bandstructure calculations for such extended systems of coupled quantum dots are made possible by a novel 'linear combination of quantum dot orbitals'--method, based on single quantum dot wavefunctions. Our results demonstrate strong vertical-emission of coupled quantum dots, reduced phonon coupling and in-plane scattering, enabling room-temperature lasing with significantly reduced threshold current densities.

arXiv commentReviewed and extended manuscript submitted to PRB; associated manuscript entitled "Efficient electronic structure calculations for extended systems of coupled quantum dots using a linear combination of quantum dot orbitals method"

References in corpus (8)

• Thermoelectrically cooled THz quantum cascade laser operating up to 210 K
• Quantum-Dot Cascade Laser: Proposal for an Ultra-Low-Threshold Semiconductor Laser
• Polaron relaxation in self-assembled quantum dots: Breakdown of the semi-classical model
• Two-well quantum cascade laser optimization by non-equilibrium Green's function modelling
• Coulomb effects in tunneling through a quantum dot stack
• Spectral broadening in self-assembled GaAs quantum dots with narrow size distribution
• Transport in serial spinful multiple-dot systems: The role of electron-electron interactions and coherences
• Efficient electronic structure calculations for extended systems of coupled quantum dots using a linear combination of quantum dot orbitals method

Cited by in corpus (2)

• Efficient electronic structure calculations for extended systems of coupled quantum dots using a linear combination of quantum dot orbitals method
• The Emission Directionality of Electronic Intraband Transitions in Stacked Quantum Dots