Abstract
We have investigated the quasiparticle dynamics and collective excitations in the quasi-one-dimensional material ZrTe5 using ultrafast optical pump-probe spectroscopy. Our time-domain results reveal two coherent oscillations having extremely low energies of ħω1 ∼0.33 meV (0.08 THz) and ħω2 ∼1.9 meV (0.45 THz), which are softened as the temperature approaches two different critical temperatures (∼54 K and ∼135 K). We attribute these two collective excitations to the amplitude mode of photoinduced dynamic charge density waves in ZrTe5 with tremendously small nesting wave vectors. Furthermore, a peculiar quasiparticle decay process associated with the ħω2 mode with a timescale of ∼1–2 ps is found below the transition temperature T* (∼135 K). Our findings provide pivotal information for studying the fluctuating order parameters and their associated quasiparticle dynamics in various low-dimensional topological systems and other materials.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974070, 11734006, 11925408, and 11921004), the Frontier Science Project of Dongguan (Grant No. 2019622101004), the National Key R&D Program of China (Grant Nos. 2016YFA0300600, and 2018YFA0305700), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), the K. C. Wong Education Foundation (Grant No. GJTD-2018-01), the Beijing Natural Science Foundation (Grant No. Z180008), the Beijing Municipal Science and Technology Commission (Grant No. Z191100007219013), and the CAS Interdisciplinary Innovation Team. We acknowledge the valuable discussion from Hrvoje Petek and Jure Demsar.
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Wei, Z., Zhang, S., Su, Y. et al. Extremely low-energy collective modes in a quasi-one-dimensional topological system. Sci. China Phys. Mech. Astron. 65, 257012 (2022). https://doi.org/10.1007/s11433-022-1855-5
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DOI: https://doi.org/10.1007/s11433-022-1855-5