Flat band in hole-doped transition metal dichalcogenide observed by angle-resolved photoemission spectroscopy

doi:10.1088/1674-1056/acc7f9

中国物理B ›› 2023, Vol. 32 ›› Issue (6): 67103-067103.doi: 10.1088/1674-1056/acc7f9

Flat band in hole-doped transition metal dichalcogenide observed by angle-resolved photoemission spectroscopy

Zilu Wang(王子禄)^1,2, Haoyu Dong(董皓宇)^1,2, Weichang Zhou(周伟昌)^3,†, Zhihai Cheng(程志海)^1,2,‡, and Shancai Wang(王善才)^1,2,§

1 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education), Renmin University of China, Beijing 100872, China;
3 School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Synergetic Innovation Center for Quantum Effects and Application, Hunan Normal University, Changsha 410081, China

收稿日期:2022-11-23 修回日期:2023-03-22 接受日期:2023-03-28 出版日期:2023-05-17 发布日期:2023-05-22
通讯作者: Weichang Zhou, Zhihai Cheng, Shancai Wang E-mail:wchangzhou@hunnu.edu.cn;zhihaicheng@ruc.edu.cn;scw@ruc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12274455, 11774421, 21622304, 61674045, 11604063, and 12074116), the National Key R&D Program of China (Grant Nos. 2016YFA0200700 and 2022YFA1403800), and the Strategic Priority Research Program (Chinese Academy of Sciences, CAS) (Grant No. XDB30000000). Z. H. Cheng was supported by the Fundamental Research Funds for the Central Universities and the Research Funds of Renmin University of China (Grant No. 21XNLG27).

Flat band in hole-doped transition metal dichalcogenide observed by angle-resolved photoemission spectroscopy

Zilu Wang(王子禄)^1,2, Haoyu Dong(董皓宇)^1,2, Weichang Zhou(周伟昌)^3,†, Zhihai Cheng(程志海)^1,2,‡, and Shancai Wang(王善才)^1,2,§

1 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education), Renmin University of China, Beijing 100872, China;
3 School of Physics and Electronics, Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Synergetic Innovation Center for Quantum Effects and Application, Hunan Normal University, Changsha 410081, China

Received:2022-11-23 Revised:2023-03-22 Accepted:2023-03-28 Online:2023-05-17 Published:2023-05-22
Contact: Weichang Zhou, Zhihai Cheng, Shancai Wang E-mail:wchangzhou@hunnu.edu.cn;zhihaicheng@ruc.edu.cn;scw@ruc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12274455, 11774421, 21622304, 61674045, 11604063, and 12074116), the National Key R&D Program of China (Grant Nos. 2016YFA0200700 and 2022YFA1403800), and the Strategic Priority Research Program (Chinese Academy of Sciences, CAS) (Grant No. XDB30000000). Z. H. Cheng was supported by the Fundamental Research Funds for the Central Universities and the Research Funds of Renmin University of China (Grant No. 21XNLG27).

摘要/Abstract

摘要： Layered transition metal dichalcogenides (TMDCs) gained widespread attention because of their electron-correlation-related physics, such as charge density wave (CDW), superconductivity, etc. In this paper, we report the high-resolution angle-resolved photoemission spectroscopy (ARPES) studies on the electronic structure of Ti-doped $1T$-Ti$_x$Ta$_{1-x}$S$_2$ with different doping levels. We observe a flat band that originates from the formation of the star of David super-cell at the $x=5$% sample at the low temperature. With the increasing Ti doping levels, the flat band vanishes in the $x=8$% sample due to the extra hole carrier. We also find the band shift and variation of the CDW gap caused by the Ti-doping. Meanwhile, the band folding positions and the CDW vector $\bm q_{{\rm{CDW}}}$ are intact. Our ARPES results suggest that the localized flat band and the correlation effect in the $1T$-TMDCs could be tuned by changing the filling factor through the doping electron or hole carriers. The Ti-doped $1T$-Ti$_x$Ta$_{1-x}$S$_2$ provides a platform to fine-tune the electronic structure evolution and a new insight into the strongly correlated physics in the TMDC materials.

关键词: transition metal dichalcogenides, charge density wave, electronic structure, angle-resolved photoemission spectroscopy (ARPES)

Abstract: Layered transition metal dichalcogenides (TMDCs) gained widespread attention because of their electron-correlation-related physics, such as charge density wave (CDW), superconductivity, etc. In this paper, we report the high-resolution angle-resolved photoemission spectroscopy (ARPES) studies on the electronic structure of Ti-doped $1T$-Ti$_x$Ta$_{1-x}$S$_2$ with different doping levels. We observe a flat band that originates from the formation of the star of David super-cell at the $x=5$% sample at the low temperature. With the increasing Ti doping levels, the flat band vanishes in the $x=8$% sample due to the extra hole carrier. We also find the band shift and variation of the CDW gap caused by the Ti-doping. Meanwhile, the band folding positions and the CDW vector $\bm q_{{\rm{CDW}}}$ are intact. Our ARPES results suggest that the localized flat band and the correlation effect in the $1T$-TMDCs could be tuned by changing the filling factor through the doping electron or hole carriers. The Ti-doped $1T$-Ti$_x$Ta$_{1-x}$S$_2$ provides a platform to fine-tune the electronic structure evolution and a new insight into the strongly correlated physics in the TMDC materials.

Key words: transition metal dichalcogenides, charge density wave, electronic structure, angle-resolved photoemission spectroscopy (ARPES)

中图分类号: (Electron density of states and band structure of crystalline solids)

71.20.-b

71.45.Lr (Charge-density-wave systems) 71.28.+d (Narrow-band systems; intermediate-valence solids)

Zilu Wang(王子禄), Haoyu Dong(董皓宇), Weichang Zhou(周伟昌), Zhihai Cheng(程志海), and Shancai Wang(王善才). Flat band in hole-doped transition metal dichalcogenide observed by angle-resolved photoemission spectroscopy[J]. 中国物理B, 2023, 32(6): 67103-067103.

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Flat band in hole-doped transition metal dichalcogenide observed by angle-resolved photoemission spectroscopy

Flat band in hole-doped transition metal dichalcogenide observed by angle-resolved photoemission spectroscopy

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