Journal
PHYSICAL REVIEW X
Volume 9, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.9.021036
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Funding
- National Natural Science Foundation of China [11888101, 11774008]
- National Key Research and Development Program of China [2017YFA0302904, 2016YFA0300902, 2018YFA0305604, 2017YFA0303302]
- Key Research Program of the Chinese Academy of Sciences [XDPB08-2]
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The 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 crystallize 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 photoinduced subpicosecond 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 a topological switch device with ultrafast excitations.
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