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2 results

  • 6 - Coupled Simulation of Quantum Electronic Transport and Thermal Transport in Mid-Infrared Quantum Cascade Lasers

  • from Part I - Bandstructure Engineering, Modeling and State-of-the-Art QCLs
  • Edited by Dan Botez, University of Wisconsin, Madison, Mikhail A. Belkin, Technische Universität München
  • Book:
    Mid-Infrared and Terahertz Quantum Cascade Lasers
    Published online:
    25 August 2023
    Print publication:
    14 September 2023, pp 173-200

  • Summary

    In this chapter, we overview recent developments of a simulation framework capable of capturing the highly nonequilibrium physics of the strongly coupled electron and phonon systems in quantum cascade lasers (QCLs). In midinfrared (mid-IR) devices, both electronic and optical phonon systems are largely semiclassical and described by coupled Boltzmann transport equations, which we solve using an efficient stochastic technique known as ensemble Monte Carlo. The optical phonon system is strongly coupled to acoustic phonons, the dominant carriers of heat, whose dynamics and thermal transport throughout the whole device are described via a global heat-diffusion solver. We discuss the roles of nonequilibrium optical phonons in QCLs at the level of a single stage , anisotropic thermal transport of acoustic phonons in QCLs, outline the algorithm for multiscale electrothermal simulation, and present data for a mid-IR QCL based on this framework.

The Physics of Graphene
  • 2nd edition
  • Mikhail I. Katsnelson
  • Published online:
    24 May 2020
    Print publication:
    19 March 2020
  • Leading graphene research theorist Mikhail I. Katsnelson systematically presents the basic concepts of graphene physics in this fully revised second edition. The author illustrates and explains basic concepts such as Berry phase, scaling, Zitterbewegung, Kubo, Landauer and Mori formalisms in quantum kinetics, chirality, plasmons, commensurate-incommensurate transitions and many others. Open issues and unsolved problems introduce the reader to the latest developments in the field. New achievements and topics presented include the basic concepts of Van der Waals heterostructures, many-body physics of graphene, electronic optics of Dirac electrons, hydrodynamics of electron liquid and the mechanical properties of one atom-thick membranes. Building on an undergraduate-level knowledge of quantum and statistical physics and solid-state theory, this is an important graduate textbook for students in nanoscience, nanotechnology and condensed matter. For physicists and material scientists working in related areas, this is an excellent introduction to the fast-growing field of graphene science.