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Elemental tellurium is a strongly spin-orbit coupled Peierls-distortedsemiconductor whose band structure features topologically protected Weyl nodes.Using time-dependent density functional theory calculations, we show thatimpulsive optical excitation can be used to transiently control the amplitudeof the Peierls distortion, realizing a mechanism to switch tellurium betweenthree states: Weyl semiconductor, Weyl metal and non-Weyl metal. Further, wepresent experimental evidence of this inverse-Peierls distortion usingtime-resolved optical second harmonic generation measurements. These resultsprovide a pathway to multifunctional ultrafast Weyl devices and introducePeierls systems as viable hosts of light-induced topological transitions.

A light-induced Weyl semiconductor-to-metal transition mediated by Peierls instability