A robust and tunable Luttinger liquid in correlated edge of transition-metal second-order topological insulator Ta2Pd3Te5

Anqi Wang, Yupeng Li, Guang Yang, Dayu Yan, Yuan Huang, Zhaopeng Guo, Jiacheng Gao, Jierui Huang, Qiaochu Zeng, Degui Qian, Hao Wang, Xingchen Guo, Fanqi Meng, Qinghua Zhang, Lin Gu, Xingjiang Zhou, Guangtong Liu, Fanming Qu, Tian Qian, Youguo Shi (), Zhijun Wang (), Li Lu () and Jie Shen ()
Additional contact information
Anqi Wang: Chinese Academy of Sciences
Yupeng Li: Chinese Academy of Sciences
Guang Yang: Chinese Academy of Sciences
Dayu Yan: Chinese Academy of Sciences
Yuan Huang: Beijing Institute of Technology
Zhaopeng Guo: Chinese Academy of Sciences
Jiacheng Gao: Chinese Academy of Sciences
Jierui Huang: Chinese Academy of Sciences
Qiaochu Zeng: Chinese Academy of Sciences
Degui Qian: Chinese Academy of Sciences
Hao Wang: Chinese Academy of Sciences
Xingchen Guo: Chinese Academy of Sciences
Fanqi Meng: Chinese Academy of Sciences
Qinghua Zhang: Chinese Academy of Sciences
Lin Gu: Chinese Academy of Sciences
Xingjiang Zhou: Chinese Academy of Sciences
Guangtong Liu: Chinese Academy of Sciences
Fanming Qu: Chinese Academy of Sciences
Tian Qian: Chinese Academy of Sciences
Youguo Shi: Chinese Academy of Sciences
Zhijun Wang: Chinese Academy of Sciences
Li Lu: Chinese Academy of Sciences
Jie Shen: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The interplay between topology and interaction always plays an important role in condensed matter physics and induces many exotic quantum phases, while rare transition metal layered material (TMLM) has been proved to possess both. Here we report a TMLM Ta2Pd3Te5 has the two-dimensional second-order topology (also a quadrupole topological insulator) with correlated edge states - Luttinger liquid. It is ascribed to the unconventional nature of the mismatch between charge- and atomic- centers induced by a remarkable double-band inversion. This one-dimensional protected edge state preserves the Luttinger liquid behavior with robustness and universality in scale from micro- to macro- size, leading to a significant anisotropic electrical transport through two-dimensional sides of bulk materials. Moreover, the bulk gap can be modulated by the thickness, resulting in an extensive-range phase diagram for Luttinger liquid. These provide an attractive model to study the interaction and quantum phases in correlated topological systems.

Date: 2023
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DOI: 10.1038/s41467-023-43361-5

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