Two-dimensional spectroscopy on a THz quantum cascade structure
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Date
2021-01
Publication Type
Journal Article
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yes
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Abstract
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.
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published
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Book title
Journal / series
Nanophotonics
Volume
10 (1)
Pages / Article No.
171 - 180
Publisher
De Gruyter
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
2D spectroscopy; Nonlinear spectroscopy; Quantum cascade laser; Quantum wells; 2D THz Spectroscopy; Semiconductors; THz; Time-resolved spectroscopy
Organisational unit
03759 - Faist, Jérôme / Faist, Jérôme
03918 - Fiebig, Manfred / Fiebig, Manfred
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Notes
Funding
820419 - Quantum simulation and entanglement engineering in quantum cascade laser frequency combs (EC)
724344 - On Chip Terahertz Frequency Combs (EC)
766719 - Intersubband Laser Light Using Monolithic INtegrated Terahertz Emitters on Silicon (EC)
178825 - Dynamical processes in systems with strong electronic correlations (SNF)
724344 - On Chip Terahertz Frequency Combs (EC)
766719 - Intersubband Laser Light Using Monolithic INtegrated Terahertz Emitters on Silicon (EC)
178825 - Dynamical processes in systems with strong electronic correlations (SNF)