تقرير
Unconventional charge density wave and photoinduced lattice symmetry change in Kagome Metal CsV$_3$Sb$_5$ probed by time-resolved spectroscopy
العنوان: | Unconventional charge density wave and photoinduced lattice symmetry change in Kagome Metal CsV$_3$Sb$_5$ probed by time-resolved spectroscopy |
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المؤلفون: | Wang, Z. X., Wu, Q., Yin, Q. W., Tu, Z. J., Gong, C. S., Lin, T., Liu, Q. M., Shi, L. Y., Zhang, S. J., Wu, D., Lei, H. C., Dong, T., Wang, N. L. |
سنة النشر: | 2021 |
المجموعة: | Condensed Matter |
مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
الوصف: | Recently, kagome lattice metal AV$_3$Sb$_5$ (A = K, Rb, Cs) family has received wide attention due to its presence of superconductivity, charge density wave (CDW) and peculiar properties from topological nontrivial electronic structure. With time-resolved pump-probe spectroscopy, we show that the excited quasiparticle relaxation dynamics can be explained by formation of energy gap below the phase transition being similar to a usual second-order CDW condensate, by contrast, the structure change is predominantly first order phase transition. Furthermore, no CDW amplitude mode is identified in the ordered phase. The results suggest that the CDW order is very different from the traditional CDW condensate. We also find that weak pump pulse can non-thermally melt the CDW order and drive the sample into its high temperature phase, revealing the fact that the difference in lattice potential between those phases is small. Comment: 3 figures, 6 pages |
نوع الوثيقة: | Working Paper |
DOI: | 10.1103/PhysRevB.104.165110 |
URL الوصول: | http://arxiv.org/abs/2105.11393 |
رقم الأكسشن: | edsarx.2105.11393 |
قاعدة البيانات: | arXiv |
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