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- Title
A robust and tunable Luttinger liquid in correlated edge of transition-metal second-order topological insulator Ta<sub>2</sub>Pd<sub>3</sub>Te<sub>5</sub>.
- Authors
Wang, Anqi; Li, Yupeng; Yang, Guang; Yan, Dayu; Huang, Yuan; Guo, Zhaopeng; Gao, Jiacheng; Huang, Jierui; Zeng, Qiaochu; Qian, Degui; Wang, Hao; Guo, Xingchen; Meng, Fanqi; Zhang, Qinghua; Gu, Lin; Zhou, Xingjiang; Liu, Guangtong; Qu, Fanming; Qian, Tian; Shi, Youguo
- 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. The interplay of electronic correlations and topology has been a forefront topic in condensed matter physics. Wang et al. present evidence of a correlated topological edge state supporting the Luttinger liquid behaviour in the candidate quadrupole topological insulator Ta2Pd3Te5.
- Subjects
LUTTINGER liquids; TOPOLOGICAL insulators; CONDENSED matter physics; TRANSITION metals; SEMIMETALS; NONFERROUS metals; PHASE diagrams
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-43361-5