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, Wang Zhijun, Lu Li, Shen Jie
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China.
Nat Commun. 2023 Nov 23;14(1):7647. doi: 10.1038/s41467-023-43361-5.
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 TaPdTe 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.
拓扑结构与相互作用之间的相互作用在凝聚态物理中始终发挥着重要作用，并引发了许多奇异的量子相，而稀有过渡金属层状材料（TMLM）已被证明同时具备这两者。在此，我们报道一种TMLM——TaPdTe具有二维二阶拓扑结构（也是一种四极拓扑绝缘体）以及相关的边缘态——卢廷格液体。这归因于由显著的双能带反转所诱导的电荷中心与原子中心不匹配的非常规性质。这种一维受保护的边缘态在从微观到宏观尺寸的尺度上都稳健且普遍地保持着卢廷格液体行为，导致通过块状材料二维侧面的显著各向异性电输运。此外，体能隙可通过厚度进行调制，从而得到卢廷格液体的大范围相图。这些为研究相关拓扑系统中的相互作用和量子相提供了一个有吸引力的模型。
