Terahertz response of optically excited semiconductors
M. Kira, W. Hoyer, S.W. Koch
TL;DR
This paper presents a microscopic theory explaining the ultrafast terahertz response of optically excited semiconductors, including plasmon resonance buildup and excitonic population formation, aligning with recent experimental observations.
Contribution
It introduces a comprehensive microscopic model that explains terahertz responses and the role of many-body correlations in semiconductors under optical excitation.
Findings
Ultrafast plasmon resonance buildup explained
Incoherent excitonic populations form slowly
Terahertz field probes correlated electron-hole pairs
Abstract
The induced terahertz response of semiconductor systems is investigated with a microscopic theory. In agreement with recent terahertz experiments, the developed theory fully explains the ultrafast build up of the plasmon resonance and the slow formation of incoherent excitonic populations. For incoherent conditions, it is shown that a terahertz field exclusively probes the correlated electron-hole pairs via a symmetry breaking between many-body correlations with even and odd functional form.
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Taxonomy
TopicsTerahertz technology and applications · Semiconductor Quantum Structures and Devices · Photonic Crystals and Applications