Journal
NANO LETTERS
Volume 19, Issue 3, Pages 1805-1813Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b04855
Keywords
charge-density wave; 1T-TaS2; multistate phase transition; intermediate state; Raman spectroscopy; electrical oscillation
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Funding
- NSFC [21 673058, 2182 2502]
- Key Research Program of Frontier Sciences of CAS [QYZDB-SSW-SYS031]
- Strategic Priority Research Program of CAS [XDB30000000]
- Beijing Nova Program-Joint Project [Z171100001117129]
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Two-dimensional layered 1T-TaS2 exhibits rich charge-density-wave (CDW) states with distinct electronic structures and physical properties, leading to broad potential applications, such as phase-transition memories, electrical oscillators and photodetectors. Besides the various CDW ground states at different temperatures, multiple intermediate phases in 1T-TaS2 have been observed by applying optical and electrical stimulations. Here, we investigated the electric-field-driven multistate CDW phase transition by Raman spectroscopy and voltage oscillations in 1T-TaS2. Strong correlation was observed between electrical conductivity and intensity of fold-back acoustic and optical phonon modes in 1T-TaS2. This indicates that the multistate transitions arise from serial transitions, from the nearly commensurate (NC) CDW phase to out-of-equilibrium intermediate states, and finally to the incommensurate (IC) CDW phase. The dynamics of phase transition under an electric field was investigated. As the electrical field increased, the dwell time of different CDW states changed. At lower temperatures, the multistate oscillations disappeared because of higher-energy barriers between the intermediate phases and/or lower thermal excitation energies at lower temperatures.
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