Comparison between semiclassical and full quantum transport analysis of THz quantum cascade lasers |
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| Affiliation: | 1. Emmy Noether Research Group “Modeling of Quantum Cascade Devices”, Technische Universität München, D-80333 Munich, Germany;2. Institute for Nanoelectronics, Technische Universität München, Arcisstr. 21, D-80333 Munich, Germany;3. Walter Schottky Institute, Technische Universität München, Am Coulombwall 3, D-85748 Garching, Germany;1. Gandhi Institute for Technological Advancement (GITA), Bhubaneswar, 752054, India;2. Biju Patnaik University of Technology (BPUT), Odisha, Rourkela, India;1. School of Sciences, Nantong University, Nantong 226007, China;2. Department of Physics, Soochow University, Suzhou 215006, China;1. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China;2. School of Physics and Optoelectronic Technology, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | We implement and compare two theoretical models for stationary electron transport in quantum cascade lasers and Stark ladders. The first one, the nonequilibrium Green's function method is a very general scheme to include coherent quantum mechanics and incoherent scattering with phonons and device imperfections self-consistently. However, it is numerically very demanding and cannot be used for systematic device parameter scans. For this reason, we also implement the approximate, numerically efficient ensemble Monte Carlo method and assess its applicability on the above mentioned transport problems. We identify a transport regime in which results of both methods quantitatively agree. In this regime, the ensemble Monte Carlo method is well suited to propose design improvements. |
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