Table 1.
Percentage contributions of selected phonon modes to out-of-plane and in-plane spin relaxation time (τs) of conduction electrons of MoS2 and MoSe2.
| System | Direction | T (K) | Modes and their contributions |
|---|---|---|---|
| MoS2 | Out-of-plane | 300 | ZA (12%), 1st E″ (21%), 2nd E″ (67%) |
| MoS2 | In-plane | 300 | LA (55%), LO (13%) |
| MoSe2 | Out-of-plane | 300 | ZA (11%), 1st E″ (36%), 2nd E″ (45%) |
| MoS2 | Out-of-plane | 150 | ZA (46%), 1st E″ (24%), 2nd E″ (29%) |
| MoS2 | Out-of-plane | 50 | ZA (99%) |
ZA, E″, LA and LO represent out-of-plane acoustic (flexural) mode, two lower-frequency in-plane optical modes, longitudinal acoustic and longitudinal optical phonon modes, respectively. (See phonon band structures in Supplementary Fig. 4).