Stacking order dynamic in the quasi-two-dimensional dichalcogenide 1T-TaS${}_2$ probed with MeV ultrafast electron diffraction

Abstract

Transitions between different charge density wave (CDW) states in quasi-two-dimensional materials may be accompanied also by changes in the inter-layer stacking of the CDW. Using MeV ultrafast electron diffraction, the out-of-plane stacking order dynamics in the quasi-two-dimensional dichalcogenide 1T-TaS${}_2$ is investigated for the first time. From the intensity of the CDW satellites aligned around the commensurate $l$ = 1/6 characteristic stacking order, it is found out that this phase disappears with a 0.5 ps time constant. Simultaneously, in the same experiment, the emergence of the incommensurate phase, with a slightly slower 2.0 ps time constant, is determined from the intensity of the CDW satellites aligned around the incommensurate $l$ = 1/3 characteristic stacking order. These results might be of relevance in understanding the metallic character of the laser-induced metastable "hidden" state recently discovered in this compound.

References in corpus (4)

• Memristive phase switching in two-dimensional crystals
• A metallic mosaic phase and the origin of Mott insulating state in 1T-TaS2
• Nanoscale manipulation of the Mott insulating state coupled to charge order in 1T-TaS2
• Ultrafast transmission electron microscopy on dynamic process of a CDW transition in 1T-TaSe2

Cited by in corpus (17)

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• A time-domain phase diagram of metastable states in a charge ordered quantum material
• Real-time observation of the coherent transition to a metastable emergent state in 1T-TaS${}_2$
• Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks
• Large optical tunability from charge density waves in 1T-TaS${}_2$ under incoherent illumination
• Unconventional light-induced states visualized by ultrafast electron diffraction and microscopy
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• A high-efficiency programmable modulator for extreme ultraviolet light with nm feature size based on an electronic phase transition
• Distinguishing and controlling Mottness in 1T-TaS${}_2$ by ultrafast light
• Megahertz cycling of ultrafast structural dynamics enabled by nanosecond thermal dissipation
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• Femtosecond trimer quench cycled at megahertz rates in the unconventional charge-density wave material $1\text{T’}-{\text{TaTe}}_2$
• Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides
• Nonvolatile optical control of interlayer stacking order in 1T-TaS2