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>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37996440.
- Also identified by DOI 10.1038/s41467-023-43361-5 and PMC identifier 10667360.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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 Ta<sub>2</sub>Pd<sub>3</sub>Te<sub>5</sub> 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.