Rubio-Verdu, Carmen Garcia-Garcia, Antonio M. Ryu, Hyejin Choi, Deung-Jang Zaldivar, Javier Tang, Shujie Fan, Bo Shen, Zhi-Xun Mo, Sung-Kwan Ignacio Pascual, Jose Ugeda, Miguel M. 2024-01-19T17:03:23Z 2024-01-19T17:03:23Z 2021-09-04 2020-07-08 1530-6984 https://pubs.kist.re.kr/handle/201004/118394 Eigenstate multifractality is a distinctive feature of noninteracting disordered metals close to a metal-insulator transition, whose properties are expected to extend to superconductivity. While multifractality in three dimensions (3D) only develops near the critical point for specific strong-disorder strengths, multifractality in 2D systems is expected to be observable even for weak disorder. Here we provide evidence for multifractal features in the superconducting state of an intrinsic, weakly disordered single-layer NbSe2 by means of low-temperature scanning tunneling microscopy/spectroscopy. The superconducting gap, characterized by its width, depth, and coherence peaks' amplitude, shows a characteristic spatial modulation coincident with the periodicity of the quasiparticle interference pattern. The strong spatial inhomogeneity of the superconducting gap width, proportional to the local order parameter in the weak-disorder regime, follows a log-normal statistical distribution as well as a power-law decay of the two-point correlation function, in agreement with our theoretical model. Furthermore, the experimental singularity spectrum f(alpha) shows anomalous scaling behavior typical from 2D weakly disordered systems. English AMER CHEMICAL SOC FLUCTUATIONS LOCALIZATION DIFFUSION ABSENCE SINGLE WAVE Visualization of Multifractal Superconductivity in a Two-Dimensional Transition Metal Dichalcogenide in the Weak-Disorder Regime Article 10.1021/acs.nanolett.0c01288 1 NANO LETTERS, v.20, no.7, pp.5111 - 5118 NANO LETTERS 20 7 5111 5118 scie scopus 000548893200055 2-s2.0-85088206814 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article FLUCTUATIONS LOCALIZATION DIFFUSION ABSENCE SINGLE WAVE STM/STS 2D transition metal dichalcogenides superconductivity disorder multifractality quasiparticle interference