Stacking order dynamics in the quasi-two-dimensional dichalcogenide 1T-TaS2 probed with MeV ultrafast electron diffraction

Structural Dynamics
L Le GuyaderH A Dürr

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-TaS2 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 0.3 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

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Citations

Sep 8, 2019·Nature Communications·Jae Whan ParkHan Woong Yeom
Apr 18, 2020·Physical Review Letters·Jongjun M LeeGil Young Cho
Mar 8, 2020·Nature Communications·Quirin StahlTobias Ritschel
Apr 21, 2021·Nature Communications·Jan RavnikDragan Mihailovic

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Methods Mentioned

BETA
electron diffraction

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