Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS2 single crystal

doi:10.1088/1674-1056/27/1/017104

中国物理B ›› 2018, Vol. 27 ›› Issue (1): 17104-017104.doi: 10.1088/1674-1056/27/1/017104

• SPECIAL TOPIC—Soft matter and biological physics (Review) • 上一篇下一篇

Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS₂ single crystal

Qing Hu(胡庆), Cong Yin(尹聪), Leilei Zhang(张雷雷), Li Lei(雷力), Zhengshang Wang(王正上), Zhiyu Chen(陈志禹), Jun Tang(唐军), Ran Ang(昂然)

1 Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2 Key Laboratory of High Energy Density Physics and Technology, Ministry of Education, Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
3 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China

收稿日期:2017-11-02 修回日期:2017-11-09 出版日期:2018-01-05 发布日期:2018-01-05
通讯作者: Ran Ang, Li Lei E-mail:rang@scu.edu.cn;lei@scu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51771126 and 11774247), the Youth Foundation of Science and Technology Department of Sichuan Province, China (Grant No. 2016JQ0051), and the World First-Class University Construction Funding.

Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS₂ single crystal

Qing Hu(胡庆)¹, Cong Yin(尹聪)¹, Leilei Zhang(张雷雷)², Li Lei(雷力)², Zhengshang Wang(王正上)¹, Zhiyu Chen(陈志禹)¹, Jun Tang(唐军)^1,3, Ran Ang(昂然)^1,3

1 Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2 Key Laboratory of High Energy Density Physics and Technology, Ministry of Education, Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
3 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China

Received:2017-11-02 Revised:2017-11-09 Online:2018-01-05 Published:2018-01-05
Contact: Ran Ang, Li Lei E-mail:rang@scu.edu.cn;lei@scu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51771126 and 11774247), the Youth Foundation of Science and Technology Department of Sichuan Province, China (Grant No. 2016JQ0051), and the World First-Class University Construction Funding.

摘要/Abstract

摘要：

The evolution of electron correlation and charge density wave (CDW) in 1T-TaS₂ single crystal has been investigated by temperature-dependent Raman scattering, which undergoes two obvious peaks of A_1g modes about 70.8 cm^-1 and 78.7 cm^-1 at 80 K, respectively. The former peak at 70.8 cm^-1 is accordant with the lower Hubbard band, resulting in the electron-correlation-driven Mott transition. Strikingly, the latter peak at 78.7 cm^-1 shifts toward low energy with increasing the temperature, demonstrating the occurrence of nearly commensurate CDW phase (melted Mott phase). In this case, phonon transmission could be strongly coupled to commensurate CDW lattice via Coulomb interaction, which likely induces appearance of hexagonal domains suspended in an interdomain phase, composing the melted Mott phase characterized by a shallow electron pocket. Combining electronic structure, atomic structure, transport properties with Raman scattering, these findings provide a novel dimension in understanding the relationship between electronic correlation, charge order, and phonon dynamics.

关键词: two-dimensional materials, charge density wave, Mott state, Raman scattering

Abstract:

Key words: two-dimensional materials, charge density wave, Mott state, Raman scattering

中图分类号: (Charge-density-wave systems)

71.45.Lr

71.30.+h (Metal-insulator transitions and other electronic transitions) 63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials) 74.25.nd (Raman and optical spectroscopy)

胡庆, 尹聪, 张雷雷, 雷力, 王正上, 陈志禹, 唐军, 昂然. Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS₂ single crystal[J]. 中国物理B, 2018, 27(1): 17104-017104.

Qing Hu(胡庆), Cong Yin(尹聪), Leilei Zhang(张雷雷), Li Lei(雷力), Zhengshang Wang(王正上), Zhiyu Chen(陈志禹), Jun Tang(唐军), Ran Ang(昂然). Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS₂ single crystal[J]. Chin. Phys. B, 2018, 27(1): 17104-017104.

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Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS₂ single crystal

Direct observation of melted Mott state evidenced from Raman scattering in 1T-TaS₂ single crystal

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