中国物理B ›› 2017, Vol. 26 ›› Issue (6): 67302-067302.doi: 10.1088/1674-1056/26/6/067302

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Tunable charge density wave in TiS3 nanoribbons

Ce Huang(黄策), Enze Zhang(张恩泽), Xiang Yuan(袁翔), Weiyi Wang(王伟懿), Yanwen Liu(刘彦闻), Cheng Zhang(张成), Jiwei Ling(凌霁玮), Shanshan Liu(刘姗姗), Faxian Xiu(修发贤)   

  1. 1 State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;
    2 Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China;
    3 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093 China
  • 收稿日期:2017-04-29 修回日期:2017-05-04 出版日期:2017-06-05 发布日期:2017-06-05
  • 通讯作者: Faxian Xiu E-mail:Faxian@fudan.edu.cn
  • 基金资助:

    Project supported by the National Young 1000-Talent Plan and the National Natural Science Foundation of China (Grant Nos. 61322407, 11474058, and 61674040).

Tunable charge density wave in TiS3 nanoribbons

Ce Huang(黄策)1,2, Enze Zhang(张恩泽)1,2, Xiang Yuan(袁翔)1,2, Weiyi Wang(王伟懿)1,2, Yanwen Liu(刘彦闻)1,2, Cheng Zhang(张成)1,2, Jiwei Ling(凌霁玮)1,2, Shanshan Liu(刘姗姗)1,2, Faxian Xiu(修发贤)1,2,3   

  1. 1 State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;
    2 Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China;
    3 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093 China
  • Received:2017-04-29 Revised:2017-05-04 Online:2017-06-05 Published:2017-06-05
  • Contact: Faxian Xiu E-mail:Faxian@fudan.edu.cn
  • Supported by:

    Project supported by the National Young 1000-Talent Plan and the National Natural Science Foundation of China (Grant Nos. 61322407, 11474058, and 61674040).

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摘要：

Recently, modifications of charge density wave (CDW) in two-dimensional (2D) show intriguing properties in quasi-2D materials such as layered transition metal dichalcogenides (TMDCs). Optical, electrical transport measurements and scanning tunneling microscopy uncover the enormous difference on the many-body states when the thickness is reduced down to monolayer. However, the CDW in quasi-one-dimensional (1D) materials like transition metal trichalcogenides (TMTCs) is yet to be explored in low dimension whose mechanism is likely distinct from their quasi-2D counterparts. Here, we report a systematic study on the CDW properties of titanium trisulfide (TiS3). Two phase transition temperatures were observed to decrease from 53 K (103 K) to 46 K (85 K) for the bulk and <15-nm thick nanoribbon, respectively, which arises from the increased fluctuation effect across the chain in the nanoribbon structure, thereby destroying the CDW coherence. It also suggests a strong anisotropy of CDW states in quasi-1D TMTCs which is different from that in TMDCs. Remarkably, by using back gate of -30 V~70 V in 15-nm device, we can tune the second transition temperature from 110 K (at -30 V) to 93 K (at 70 V) owing to the altered electron concentration. Finally, the optical approach through the impinging of laser beams on the sample surface is exploited to manipulate the CDW transition, where the melting of the CDW states shows a strong dependence on the excitation energy. Our results demonstrate TiS3 as a promising quasi-1D CDW material and open up a new window for the study of collective phases in TMTCs.

关键词: TiS3, two-dimensional material, charge density wave, phase transition

Abstract:

Recently, modifications of charge density wave (CDW) in two-dimensional (2D) show intriguing properties in quasi-2D materials such as layered transition metal dichalcogenides (TMDCs). Optical, electrical transport measurements and scanning tunneling microscopy uncover the enormous difference on the many-body states when the thickness is reduced down to monolayer. However, the CDW in quasi-one-dimensional (1D) materials like transition metal trichalcogenides (TMTCs) is yet to be explored in low dimension whose mechanism is likely distinct from their quasi-2D counterparts. Here, we report a systematic study on the CDW properties of titanium trisulfide (TiS3). Two phase transition temperatures were observed to decrease from 53 K (103 K) to 46 K (85 K) for the bulk and <15-nm thick nanoribbon, respectively, which arises from the increased fluctuation effect across the chain in the nanoribbon structure, thereby destroying the CDW coherence. It also suggests a strong anisotropy of CDW states in quasi-1D TMTCs which is different from that in TMDCs. Remarkably, by using back gate of -30 V~70 V in 15-nm device, we can tune the second transition temperature from 110 K (at -30 V) to 93 K (at 70 V) owing to the altered electron concentration. Finally, the optical approach through the impinging of laser beams on the sample surface is exploited to manipulate the CDW transition, where the melting of the CDW states shows a strong dependence on the excitation energy. Our results demonstrate TiS3 as a promising quasi-1D CDW material and open up a new window for the study of collective phases in TMTCs.

Key words: TiS3, two-dimensional material, charge density wave, phase transition

中图分类号:  (Electronic structure of graphene)

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