Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 39: 2D Materials III: Growth and Heterostructures (joint session O/HL)
O 39.11: Talk
Tuesday, March 17, 2020, 13:00–13:15, GER 38
Visualization of multifractal superconductivity in a two-dimensional transition metal dichalcogenide in the weak-disorder regime — Carmen Rubio-Verdú1, Antonio M. García-García2, Hyejin Ryu3, Deung-Jang Choi1, Javier Zaldívar1, Shujie Tang3, Bo Fan2, Zhi-Xun Shen4, Sung-Kwan Mo3, José Ignacio Pascual1, and •Miguel M. Ugeda5 — 1CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain. — 2Shanghai Center for Complex Physics, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China. — 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. — 4Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA. — 5Donostia International Physics Center (DIPC), 20018 San Sebastián, Spain.
Here we investigate the impact of multifractality on the superconducting state of a weakly disordered single-layer of NbSe2 by LT-STM/STS. The SC gap (width, depth and coherence peaks amplitude) shows characteristic spatial single-wavelength modulation coincident with the periodicity of the QPI pattern observed at EF. Spatial inhomogeneity of the SC gap width, which is proportional to the order parameter in the weak-disorder regime, shows a characteristic log-normal statistical distribution as well as a power-law decay of the two-point correlation function, in agreement with our theoretical model. This novel state is universal and governs the properties of even weakly disordered 2D superconductors with SOC.