Table 1 Electron–phonon coupling parameters extracted from the temperature-dependent Raman spectroscopy measurement

From: Evidence of strong and mode-selective electron–phonon coupling in the topological superconductor candidate 2M-WS2

Peak

Bg(1)

Ag(1)

Ag(2)

Bg(2)

Ag(3)/ Bg(3)

Ag(4)

Ag(5)

Ag(6)

\({\omega }_{0}^{{\rm{cal.}}}\) (meV)

14.4

16.0

22.5

29.3

33.5/33.8

38.4

39.9

50.7

\({\omega }_{0}^{{\rm{Raman.}}}\) (meV)

14.4

15.9

23.3

29.9

34.2

39.6

41.7

50.8

\({\varGamma }_{{{\rm{ph}}}-e}^{i}\) (meV)

0.41

0.24

1.23

0.28

1.82

0.47

0.16

0.76

\({\lambda }_{e-{{\rm{ph}}}}^{i}\)

0.912

0.438

1.045

0.145

0.718

0.138

0.042

0.136

  1. \({\omega }_{0}^{{\rm{cal.}}}\) is the first-principles calculated phonon energies. \({\omega }_{0}^{{\rm{Raman.}}}\) is the phonon energy extracted from the lowest-temperature (5 K) Raman measurement by Lorentzian fitting. \({\varGamma }_{{{\rm{ph}}}-e}^{i}\) is the magnitude of mode-selective phonon linewidths due to phonon–electron scattering, which is obtained by fitting the temperature-dependent Raman phonon linewidth (see Fig. 2d–g) using Eq. (1) for each mode. \({\lambda }_{e-{{\rm{ph}}}}^{i}\) is the mode-selective EPC strength derived from Eq. (2), where N0(EF) = 1.38 states/eV/f.u. = 2.76 states/eV/u.c. is obtained from the noninteracting ab initio calculation (see Fig. 1g). f.u. represents a formula unit, and u.c. represents a unit cell.
Back to article page