Light induced sub-picosecond topological phase transition in MoTe2

Abstract

Recent development of ultrashort laser pulses allows for optical control of structural and electronic properties of complex quantum materials. The layered transition metal dichalcogenide MoTe2, which can crystalize into several different structures with distinct topological and electronic properties, provides possibilities to control or switch between different phases. In this study we report a photo-induced sub-picosecond structural transition between the type-II Weyl semimetal phase and normal semimetal phase in bulk crystalline MoTe2 by using ultrafast pump-probe and time-resolved second harmonic generation spectroscopy. The phase transition is most clearly characterized by the dramatic change of the shear oscillation mode and the intensity loss of second harmonic generation. This work opens up new possibilities for ultrafast manipulation of the topological properties of solids, enabling potentially practical applications for topological switch device with ultrafast excitations.

arXiv comment8 pages,4 figures

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• Floquet theory of photoinduced topological phase transitions in the organic salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$ irradiated with elliptically polarized light
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• A compact and stable incidence-plane-rotating second harmonics detector
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• Predicted novel type of photoinduced topological phase transition accompanied by collision and collapse of Dirac-cone pair in organic salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Ultrafast melting of charge-density wave fluctuations at room temperature in $1T-TiS{e}_2$ monitored under non-equilibrium conditions
• Ultrafast photoinduced phase transition in the antiferromagnetic Dirac semimetal EuAgAs
• Dominant two-dimensional electron-phonon interactions in the bulk Dirac semimetal Na3Bi
• Large change of interlayer vibrational coupling with stacking in Mo${}_{1-x}$W${}_x$Te${}_2$
• Light-induced renormalization of the band structure of chiral tellurium
• Role of interlayer shear phonons on lattice symmetry switching in the transition metal dichalcogenide WTe${}_2$
• Multiple Floquet Chern insulator phases in the spin-charge coupled triangular-lattice ferrimagnet: Crucial role of higher-order terms in the high-frequency expansion
• Giant Shear Displacement by Light-Induced Raman Force in Bilayer Graphene
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• Topological analog of the magnetic bit within the Su-Schrieffer-Heeger-Holstein model
• Low-frequency and Moiré Floquet engineering: a review
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• Research on topological materials using ultrafast spectroscopy
• Light-induced shear phonon splitting and instability in bilayer graphene
• Direct measurement of photoinduced transient conducting state in multilayer 2H-MoTe2
• Coherent Phonon-Driven Band Renormalizations in 1T${}^{\prime }$-MoTe${}_2$