Implementation of non-uniform mesh in non-equilibrium Green’s function simulations of quantum cascade lasers

Hałdaś, G.

doi:10.1007/s10825-019-01386-4

Cited by 18 publications

(6 citation statements)

References 25 publications

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“…The rest of the cascade was mimicked by suitable contact selfenergies 17 . Non-uniform discretization mesh was used to reduce numerical load without losing the accuracy 38 . The parameters m* and E g for ternary materials used for QCL layers were taken from ref.…”

Section: Methodsmentioning

confidence: 99%

Light-enhanced incoherence of electronic transport in quantum cascade lasers

Kolek

2020

Sci Rep

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Since their invention in the middle of the 1990s, quantum cascade lasers (QCLs) attract increasing theoretical interest stimulated by their widening applications. one of the key theoretical issues is the optimization of electronic transport which in most of these devices is governed by the injection barrier of QCL heterostructure. In the paper, the nonequilibrium Green's function formalism is used to study electronic transition through the injection barrier as a function of laser field in the cavity; for the increasing field, a crossover is observed from the strong coupling regime, in which electronic transport through the barrier is coherent, to the weak coupling regime, in which electronic transport gets incoherent. This crossover is characterized by gain recovery time, τ rec , which takes sub-picosecond values for mid-IR QCLs operating at room temperature. This time is also important for the performance of devices under steady-state conditions; the maximum output power is obtained when the figure of merit, FOM = (g(0)/g th − 1)/g c τ rec [g(0) is the linear response gain, g th is the threshold gain needed to compensate all losses, g c is the gain cross-section], reaches maximum. It is shown that the use of this optimization criterion can result in the structures essentially different from those which can be obtained when the optimized quantity is the linear response gain, g(0).

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Section: Methodsmentioning

confidence: 99%

Light-enhanced incoherence of electronic transport in quantum cascade lasers

Kolek

2020

Sci Rep

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“…Then, the gain/absorption was calculated basing on the theory outlined by Lee and Wacker (2002), implemented for the case of energy-dependent effective mass (Kolek 2015). All the formulations were adapted for the case of nonuniform grid as in Hałdaś's (2019) paper.…”

Section: Model and Methodsmentioning

confidence: 99%

Comparison of quantum cascade structures for detection of nitric oxide at ~ 5.2 μm

2019

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“…Selection of recent computational research: Hałdaś et al used an NEGF approach to simulate scattering transport in a THz QCL [365]. The authors developed a non-uniform mesh based approach to tackle the computational effort.…”

Section: Quantum Cascade Devicesmentioning

confidence: 99%

Computational perspective on recent advances in quantum electronics: from electron quantum optics to nanoelectronic devices and systems

Weinbub

Kosik

2022

J. Phys.: Condens. Matter

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Quantum electronics has significantly evolved over the last decades. Where initially the clear focus was on light-matter interactions, nowadays approaches based on the electron's wave nature have solidified themselves as additional focus areas. This development is largely driven by continuous advances in electron quantum optics, electron based quantum information processing, electronic materials, and nanoelectronic devices and systems. The pace of research in all of these areas is astonishing and is accompanied by substantial theoretical and experimental advancements. What is particularly exciting is the fact that the computational methods, together with broadly available large-scale computing resources, have matured to such a degree so as to be essential enabling technologies themselves. These methods allow to predict, analyze, and design not only individual physical processes but also entire devices and systems, which would otherwise be very challenging or sometimes even out of reach with conventional experimental capabilities. This review is thus a testament to the increasingly towering importance of computational methods for advancing the expanding field of quantum electronics. To that end, computational aspects of a representative selection of recent research in quantum electronics are highlighted where a major focus is on the electron's wave nature. By categorizing the research into concrete technological applications, researchers and engineers will be able to use this review as a source for inspiration regarding problem-specific computational methods.

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Implementation of non-uniform mesh in non-equilibrium Green’s function simulations of quantum cascade lasers

Cited by 18 publications

References 25 publications

Light-enhanced incoherence of electronic transport in quantum cascade lasers

Light-enhanced incoherence of electronic transport in quantum cascade lasers

Comparison of quantum cascade structures for detection of nitric oxide at ~ 5.2 μm

Computational perspective on recent advances in quantum electronics: from electron quantum optics to nanoelectronic devices and systems

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