Abstract
Charge density wave (CDW) and their interplay with correlated and topological quantum states are at the forefront of condensed matter research. The 4Hb-TaS2 is a CDW ordered quantum heterostructure that is formed by alternative stacking of Mott insulating 1T-TaS2 and Ising superconducting 1H-TaS2. While the 13×13 and 3×3 CDWs have been respectively observed in the bulk 1T-TaS2 and 2H-TaS2, the CDWs and their pivotal role for unconventional superconductivity in the 4Hb-TaS2 remain unsolved. In this Letter, we reveal the two-dimensional (2D) 13×13 chiral CDW in the 1T layers and intraunit cell coupled 2D 2×2 CDW in the 1H and 1H' layers of 4Hb-TaS2. Our results establish 4Hb-TaS2 a 2.5D quantum heterostructure, where 2D quantum states emerge from 3D crystalline structure.
| Original language | English |
|---|---|
| Article number | L041101 |
| Journal | Physical Review B |
| Volume | 111 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jan 15 2025 |
Funding
We thank Gang Chen, Hong Ding, Patrick A. Lee, Chao-Xing Liu, Lingyuan Kong, Wenyao Liu, Qiangsheng Lu, Ziqiang Wang, Binghai Yan, Jiaqiang Yan, Noah F. Q. Yuan, Rui-Xing Zhang, and Yang Zhang for stimulating discussions. This research was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (X-ray and ARPES). X-ray scattering used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science user facility and is also based on work supported by Laboratory Directed Research and Development (LDRD) funding from Argonne National Laboratory, provided by the Director, Office of Science, of the U.S. DOE under Contract No. DE-AC02-06CH11357. ARPES and X-ray scattering measurements used resources at 21-ID-1, 4-ID and 10-ID beamlines of the National Synchrotron Light Source II, a U.S. Department of Energy, Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. H.C.L. was supported by National Key R&D Program of China (Grants No. 2023YFA1406500 and No. 2022YFA1403800) and National Natural Science Foundation of China (Grant No. 12274459).