Abstract
CsV3Sb5 has attracted much recent attention as the first quasi-two-dimensional (2D) kagome superconductor. While the kagome layers are 2D in nature, increasing evidence has pointed to the importance of out-of-plane correlation in this material. However, it remains unclear whether such correlation can change the fundamental electronic structure of the quasi-2D system. Here, we reveal this missing piece of information, using angle-resolved photoemission spectroscopy, complemented by scanning tunneling microscope measurements. The three-dimensional electronic structures in the high-temperature state are revealed, which agree well with density-functional theory calculations. Electron energy bands are observed in the low-temperature state that exhibit additional periodicities along the out-of-plane momentum. These results reveal a direct response to the out-of-plane electronic supermodulation in the single-particle spectral function of CsV3Sb5, thus establishing an electronic platform to examine emergent phenomena beyond 2D limit in kagome superconductors.
| Original language | English |
|---|---|
| Article number | L241111 |
| Journal | Physical Review B |
| Volume | 105 |
| Issue number | 24 |
| DOIs | |
| State | Published - Jun 15 2022 |
| Externally published | Yes |
Funding
We thank useful discussions with M. Shi, T. Wu, J.-J. Ying, and Z.-J. Xiang. The work at University of Science and Technology of China (USTC) was supported by the Fundamental Research Funds for the Central Universities (Grants No. WK3510000008 and No. WK3510000012) and USTC start-up fund. The work at UC Santa Barbara was supported via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under Award No. DMR-1906325. This research made use of the shared facilities of the NSF Materials Research Science and Engineering Center at UC Santa Barbara (Grant No. DMR-1720256). The UC Santa Barbara MRSEC is a member of the Materials Research Facilities Network . S.M.L.T. acknowledges use of the shared computing facilities of the Center for Scientific Computing at UC Santa Barbara, supported by NSF Grant No. CNS-1725797 and NSF Grant No. DMR-1720256. B.R.O. acknowledges support from the California NanoSystems Institute through the Elings Fellowship program. S.M.L.T has been supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1650114. The work at PSI was supported by the Swiss National Science Foundation under Grant. No. 200021-188413, and the Sino-Swiss Science and Technology Cooperation (Grant No. IZLCZ2-170075). Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.