Role of the lattice in the light-induced insulator-to-metal transition in vanadium dioxide

Cedric Weber, Swagata Acharya, Brian Cunningham, Myrta Grüning, Liangliang Zhang, Hang Zhao, Soo-Yong Tan, Yan Zhang, Cunlin Zhang, Kai Liu, Mark van Schilfgaarde, Mostafa Shalaby

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Vanadium dioxide is a model material system which exhibits a metal-to-insulator transition at 67 ◦ C. This holds potential for future ultrafast switching in memory devices but typically requires a purely electronic process to avoid the slow lattice response. The role of lattice vibrations is thus important, but it is not fully understoodand it has been a long-standing source of controversy. We use ultrafast spectroscopy and ab initio quantum calculations to study the mechanism responsible for the transition. We identify an atypical Peierls vibrational mode associated with the transition and study its associated properties. Our findings led to theoretical prediction of a new electron-phonon pathway for a purely reversible electronic transition in a true bistable fashion underspecific conditions. This transition is very atypical, as it involves purely chargelike excitations and requires only small nuclear displacement and might prompt future experimental investigations.
Original languageEnglish
Article number023076
Number of pages6
JournalPhysical Review Research
Publication statusPublished - 24 Apr 2020


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