Embedded metallic nanoparticles facilitate metastability of switchable metallic domains in Mott threshold switches

Minguk Jo, Ye-Won Seo, Hyojin Yoon, Yeon-Seo Nam, Si-Young Choi, Byung Joon Choi and Junwoo Son ()
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Minguk Jo: Pohang University of Science and Technology (POSTECH)
Ye-Won Seo: Pohang University of Science and Technology (POSTECH)
Hyojin Yoon: Pohang University of Science and Technology (POSTECH)
Yeon-Seo Nam: Pohang University of Science and Technology (POSTECH)
Si-Young Choi: Pohang University of Science and Technology (POSTECH)
Byung Joon Choi: Department of Materials Science and Engineering (MSE), Seoul National University of Science and Technology (Seoultech)
Junwoo Son: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Mott threshold switching, which is observed in quantum materials featuring an electrically fired insulator-to-metal transition, calls for delicate control of the percolative dynamics of electrically switchable domains on a nanoscale. Here, we demonstrate that embedded metallic nanoparticles (NP) dramatically promote metastability of switchable metallic domains in single-crystal-like VO2 Mott switches. Using a model system of Pt-NP-VO2 single-crystal-like films, interestingly, the embedded Pt NPs provide 33.3 times longer ‘memory’ of previous threshold metallic conduction by serving as pre-formed ‘stepping-stones’ in the switchable VO2 matrix by consecutive electical pulse measurement; persistent memory of previous firing during the application of sub-threshold pulses was achieved on a six orders of magnitude longer timescale than the single-pulse recovery time of the insulating resistance in Pt-NP-VO2 Mott switches. This discovery offers a fundamental strategy to exploit the geometric evolution of switchable domains in electrically fired transition and potential applications for non-Boolean computing using quantum materials.

Date: 2022
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DOI: 10.1038/s41467-022-32081-x

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