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

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)023076
JournalPhysical Review Research
Volume2
Publication statusPublished - 24 Apr 2020

Documents

  • LJ16693W

    LJ16693W.pdf, 2.62 MB, application/pdf

    28/04/2020

    Accepted author manuscript

    Other

King's Authors

Abstract

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 understood and 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 under specific conditions. This transition is very atypical, as it involves purely chargelike excitations and requires only small nuclear displacement and might prompt future experimental investigations.

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