Impact of terahertz short pulses on the oxygen defect state in TiO$_{2-x}$ Article Swipe

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Paola Di Pietro , Johannes Schmidt , Nidhi Adhlakha , Sandeep Kumar Chaluvadi , Federico Mazzola , Veronica Stopponi , Luca Tomarchio , P. Orgiani , S. Lupi , A. Perucchi ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2407.12606

Oxygen deficient titanium dioxide (TiO$_{2-x}$) is a very attractive material for several applications ranging from photocatalysis to resistive switching. Oxygen vacancies turn insulating anatase titanium dioxide into a polaronic conductor, while creating a defect state band below the ultraviolet semiconducting gap. Here we employ a combination of broadband infrared (IR) reflectivity and THz-pump/IR-probe measurements to investigate the relationship between localized defect states and delocalized conducting polaronic states. We show that the THz pump allows to convert deeply localized electrons into metastable polarons with a lifetime in the ns range. These long-lived metastable states may find application in novel opto-electronic applications exploiting the interplay of dc resistivity, with terahertz and infrared signals.

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Terahertz radiation Oxygen State (computer science) Materials science Optoelectronics Engineering physics Physics Computer science Quantum mechanics Algorithm

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2407.12606
PDF: https://arxiv.org/pdf/2407.12606
OA Status: green
Related Works: 10
OpenAlex ID: https://openalex.org/W4402345946

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DOI: https://doi.org/10.48550/arxiv.2407.12606

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Title: Impact of terahertz short pulses on the oxygen defect state in TiO$_{2-x}$

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Type: preprint

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Language: en

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Publication year: 2024

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Publication date: 2024-07-17

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Authors: Paola Di Pietro, Johannes Schmidt, Nidhi Adhlakha, Sandeep Kumar Chaluvadi, Federico Mazzola, Veronica Stopponi, Luca Tomarchio, P. Orgiani, S. Lupi, A. Perucchi

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Landing page: https://arxiv.org/abs/2407.12606

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PDF URL: https://arxiv.org/pdf/2407.12606

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Concepts: Terahertz radiation, Oxygen, State (computer science), Materials science, Optoelectronics, Engineering physics, Physics, Computer science, Quantum mechanics, Algorithm

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