A robust and tunable Luttinger liquid in correlated edge of transition-metal second-order topological insulator Ta${}_2$Pd${}_3$Te${}_5$

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${}_2$Pd${}_3$Te${}_5$ 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.

41 pages, 6 Main Figures + 14 Supplementary Figure

References in corpus (14)

• Higher-order topological insulators and semimetals on the breathing Kagome and pyrochlore lattices
• Topological Mott Insulators
• Classical higher-order topological insulators
• Kondo effect in the helical edge liquid of the quantum spin Hall state
• Electron Transport in a Multi-Channel One-Dimensional Conductor: Molybdenum Selenide Nanowires
• Unconventional Materials: the mismatch between electronic charge centers and atomic positions
• Long-range nontopological edge currents in charge-neutral graphene
• Apparent power-law behavior of conductance in disordered quasi-one-dimensional systems
• Quadrupole topological insulators in Ta2M3Te5 (M= Ni, Pd) monolayers
• Quantum Spin Hall Effect in Ta${}_2$M${}_3$Te${}_5$ (M = Pd, Ni)
• Interacting multi-channel topological boundary modes in a quantum Hall valley system
• Coulomb blockade and transport in a chain of one-dimensional quantum dots
• Observation of quantum spin Hall states in Ta${}_2$Pd${}_3$Te${}_5$
• Superconductivity in Nb2Pd3Te5 and Chemically-Doped Ta2Pd3Te5

Cited by in corpus (7)

• Interfering Josephson diode effect in Ta2Pd3Te5 asymmetric edge interferometer
• Evidence for an Excitonic Insulator State in Ta${}_2$Pd${}_3$Te${}_5$
• Platforms for the realization and characterization of Tomonaga-Luttinger liquids
• Weak antilocalization in the transition metal telluride Ta${}_2$Pd${}_3$Te${}_5$
• Generic Approach to Intrinsic Magnetic Second-order Topological Insulators via Inverted $p-d$ Orbitals
• Quantum Coherent Transport of 1D ballistic states in second order topological insulator Bi${}_4$Br${}_4$
• Quantized Transport of $\nu =2/3$ Fractional Quantum Hall Edge with Disordered Superconducting Proximity