Two-dimensional spectroscopy on a THz quantum cascade structure
| Autor: | David Stark, Jérôme Faist, Martin Franckié, Manfred Fiebig, Sergej Markmann, Shovon Pal, Mattias Beck, Giacomo Scalari |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Time-resolved spectroscopy
Terahertz radiation QC1-999 Quantum cascade laser 02 engineering and technology 01 natural sciences 2D spectroscopy Nonlinear spectroscopy Quantum wells 2D THz Spectroscopy Semiconductors THz law.invention 010309 optics law 0103 physical sciences Electrical and Electronic Engineering Spectroscopy Quantum Quantum well Physics business.industry 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Semiconductor Cascade Optoelectronics 0210 nano-technology business Biotechnology |
| Zdroj: | Nanophotonics, 10 (1) Nanophotonics Nanophotonics, Vol 10, Iss 1, Pp 171-180 (2020) |
| ISSN: | 2192-8614 |
| Popis: | Understanding and controlling the nonlinear optical properties and coherent quantum evolution of complex multilevel systems out of equilibrium is essential for the new semiconductor device generation. In this work, we investigate the nonlinear system properties of an unbiased quantum cascade structure by performing two-dimensional THz spectroscopy. We study the time-resolved coherent quantum evolution after it is driven far from equilibrium by strong THz pulses and demonstrate the existence of multiple nonlinear signals originating from the engineered subbands and find the lifetimes of those states to be in the order of 4–8 ps. Moreover, we observe a coherent population exchange among the first four intersubband levels during the relaxation, which have been confirmed with our simulation. We model the experimental results with a time-resolved density matrix based on the master equation in Lindblad form, including both coherent and incoherent transitions between all density matrix elements. This allows us to replicate qualitatively the experimental observations and provides access to their microscopic origin. Nanophotonics, 10 (1) ISSN:2192-8614 |
| Databáze: | OpenAIRE |
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