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Visualization of Multifractal Superconductivity in a Two-Dimensional Transition Metal Dichalcogenide in the Weak-Disorder Regime

Journal Article · · Nano Letters
 [1];  [2];  [3];  [4];  [1];  [5];  [2];  [6];  [7];  [8];  [4]
  1. CIC nanoGUNE, Donostia-San Sebastián (Spain)
  2. Shanghai Jiao Tong Univ. (China)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Korea Inst. of Science and Technology, Seoul (Korea, Republic of)
  4. CIC nanoGUNE, Donostia-San Sebastián (Spain); Basque Foundation for Science, Bilbao (Spain); Donostia International Physics Center (DIPC) (Spain); Centro de Física de Materiales, San Sebastian (Spain)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  8. CIC nanoGUNE, Donostia-San Sebastián (Spain); Basque Foundation for Science, Bilbao (Spain)
+ Show Author Affiliations
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(α) shows anomalous scaling behavior typical from 2D weakly disordered systems.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1646805
Alternate ID(s):
OSTI ID: 1775393
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 7 Vol. 20; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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