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arxiv 2110.15746 v1 pith:3YDMZMSJ submitted 2021-10-29 cond-mat.str-el

Optical spectroscopy and ultrafast pump-probe study of structural phase transition in 1T'-TaTe2

T. C. Hu , Q. Wu , Z. X. Wang , L. Y. Shi , Q. M. Liu , L. Yue , S. J. Zhang , R. S. Li
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X. Y. Zhou S. X. Xu D. Wu T. Dong N. L. Wang
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classification cond-mat.str-el
keywords transitionphasestructuralopticalultrafastelectronicoriginpump-probe
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1T'-TaTe2 exhibits an intriguing first-order structural phase transition at around 170 K. Understanding the electronic structural properties is a crucial way to comprehend the origin of the structural phase transition. We performed a combined optical and ultrafast pump-probe study on the compound across the transition temperature. The phase transition leads to abrupt changes of both optical spectra and ultrafast electronic relaxation dynamics. The measurements revealed a sudden reconstruction of band structure. We elaborate that the phase transition is of the first order and can not be attributed to the conventional density-wave type instability. Our work is illuminating for understanding the origin of the structural phase transition.

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