Charge Density Waves in the 2.5-Dimensional Quantum Heterostructure

F. Z. Yang; T. T. Zhang; F. Y. Meng; H. C. Lei; C. Nelson; Y. Q. Cai; E. Vescovo; A. H. Said; P Mercado Lozano; G. Fabbris; H. Miao

doi:10.1103/PhysRevB.111.L041101

paper

Charge Density Waves in the 2.5-Dimensional Quantum Heterostructure

arXiv:2407.14661 · doi:10.1103/PhysRevB.111.L041101

Abstract

Charge density wave (CDW) and their interplay with correlated and topological quantum states are forefront of condensed matter research. The 4 $H_{b}$ -TaS $_{2}$ is a CDW ordered quantum heterostructure that is formed by alternative stacking of Mott insulating 1T-TaS $_{2}$ and Ising superconducting 1H-TaS $_{2}$ . While the $13 \times 13$ and 3 $\times$ 3 CDWs have been respectively observed in the bulk 1T-TaS $_{2}$ and 2H-TaS $_{2}$ , the CDWs and their pivotal role for unconventional superconductivity in the 4 $H_{b}$ -TaS $_{2}$ remain unsolved. In this letter, we reveal the 2-dimensional (2D) $13 \times 13$ chiral CDW in the 1T-layers and intra-unit cell coupled 2D 2 $\times$ 2 CDW in the 1H and 1H' layers of 4 $H_{b}$ -TaS $_{2}$ . Our results establish 4 $H_{b}$ -TaS $_{2}$ a novel 2.5D quantum heterostructure, where 2D quantum states emerge from 3D crystalline structure.