Science Advances

Supplementary Materials

This PDF file includes:

  • section S1. Determining the Dirac point position from dI/dV spectra
  • section S2. Demonstrating the spatial and energy correspondence between STS measurements of the Na3Bi Dirac point and defect quasi-bound state
  • section S3. Demonstrating that charge puddling is correlated with Na(2) vacancies
  • section S4. Correlation of resonance state in dI/dV spectra with lattice defects
  • section S5. Calculation of puddle coherence length from autocorrelation analysis
  • section S6. Theory discussion on correlation length, impurity density, and mobility
  • section S7. DFT calculations of Na vacancies in the Na3Bi lattice
  • fig. S1. Determining the Dirac point position from the dI/dV spectra.
  • fig. S2. STM topography of region A (as in Fig. 1C) showing the 1 × 1 Na3Bi (001), Na(2)-terminated surface, with vacancy point defects and unidentified impurities visible.
  • fig. S3. Frequency histogram of the measured Dirac point and Na(2) vacancy quasi-bound state (STS peak, ~30 mV below the Dirac point) features extracted from STS of region A.
  • fig. S4. Radially averaged correlation profiles for spatial profiles of key STS features in region A.
  • fig. S5. STM topography and charge puddling map of p-type Na3Bi on region A.
  • fig. S6. Spatial dependence of defect resonance.
  • fig. S7. Electronic structure of pristine and defective Na3Bi.
  • fig. S8. Total DOS of pristine and defective Na3Bi.
  • fig. S9. Comparison of calculated total DOS and projected DOS on surface for Na3Bi with Na(2) vacancy.
  • fig. S10. Comparison of calculated total DOS and projected DOS on individual atomic layers for Na3Bi with Na(2) vacancy.
  • table S1. Charged impurity density for EF »Erms calculated using Thomas– Fermi and RPA for both region A, B, and C.
  • table S2. Mobility for EF »Erms calculated using Thomas– Fermi and RPA for both region A, B, and C.
  • References (35–39)

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