Table 1 Phonon frequencies (cm−1) in the second-order Raman scattering spectra of monolayer WS2 excited by the 2.33, 2.54, 4.66, and 4.82 eV laser lines. A comparison is given between the experimentally unassigned modes and the calculated second-order phonon spectra at high-symmetry M, K, and Γ points.
From: Deep-ultraviolet Raman scattering spectroscopy of monolayer WS2
EL(eV) | ωexp(cm−1) | |||||
|---|---|---|---|---|---|---|
2.33 | 176 | 298 | 324 | 526 | 586 | 704 |
2.54 | 176 | 298 | 322 | 524 | 586 | 706 |
ωtheory(cm−1) | ||||||
2.33,2.54 | 171 | 296 | 334 | 531 | 584 | 710 |
mode | \({{\rm{E}}}_{2g}^{1}\)(K) − LA(K) | 2TA(K) | \({{\rm{B}}}_{2g}^{1}\)(K) | A1g1g(K) + ZA(K) | 2E 1g(Γ) | \({{\rm{E}}}_{2g}^{1}\)(K) + \({{\rm{E}}}_{2g}^{2}\)(K) |
EL(eV) | ωexp(cm−1) | |||||
4.66 | 369 | 708 | 768 | 824 | 816 | |
4.82 | 369 | 708 | 743 | 792 | 826 | |
ωtheory(cm−1) | ||||||
4.66 | 367 | 707 | 763 | 821 | 814 | |
4.82 | 367 | 707 | 737 | 791 | 823 | |
mode | 2LA(M) | \({{\rm{E}}}_{2g}^{1}\)(M) + \({{\rm{E}}}_{2g}^{2}\)(M) | A1g(M) + \({{\rm{E}}}_{2g}^{2}\)(M) | 2A 1g(M) | 2A 1g(K) | |
