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1 PublikationUltrafast response of photoexcited carriers in VO₂ at high-pressure
Braun, J. M.; Schneider, H.; Helm, M.; Mirek, R.; Boatner, L. A.; Marvel, R. E.; Haglund Jr., R. F.; Pashkin, A.
Abstract
We utilize near-infrared pump — mid-infrared probe spectroscopy to investigate the ultrafast electronic response of pressurized VO₂. A clear anomaly in the linear mid-infrared response as well as in the fluence dependence of the pump-probe signal is observed around 8 GPa indicating a pressure-induced phase transition. Distinct pump-probe signals and a pumping threshold behavior typical for the insulating VO₂ phase persist also in the high-pressure phase. Thus, in contrast to the temperature-induced rutile metallic state of VO₂, the pressure-induced monoclinic phase preserves the energy gap. However, our results indicate the appearance and a gradual growth of additional intragap states upon increasing pressure above 8 GPa. These observations can be interpreted in terms of a bandwidth-controlled Mott – Hubbard transition.
Keywords: metal-insulator transition; vanadium dioxide; ultrafast spectroscopy; high-pressure
Verknüpfte Publikationen
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Ultrafast carrier dynamics in VO₂ across the pressure-induced …
ROBIS: 25953 is previous version of this (Id 27283) publication
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New Journal of Physics 20(2018), 083003
DOI: 10.1088/1367-2630/aad4ef
ISSN: 1367-2630
Cited 15 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-27283