Abstract
Charge density wave (CDW) and their interplay with correlated and topological quantum states are at the forefront of condensed matter research. The 4β’π»πβTaS2 is a CDW ordered quantum heterostructure that is formed by alternative stacking of Mott insulating 1T-TaS2 and Ising superconducting 1H-TaS2. While the β13Γβ13 and 3Γ3 CDWs have been respectively observed in the bulk 1T-TaS2 and 2H-TaS2, the CDWs and their pivotal role for unconventional superconductivity in the 4β’π»πβTaS2 remain unsolved. In this Letter, we reveal the two-dimensional (2D) β13Γβ13 chiral CDW in the 1T layers and intraunit cell coupled 2D 2Γ2 CDW in the 1H and 1H' layers of 4β’π»πβTaS2. Our results establish 4β’π»πβTaS2 a 2.5D quantum heterostructure, where 2D quantum states emerge from 3D crystalline structure.