Table 1 Phonon frequencies of acoustic branches (LA, ZA, and TA) at the M and K points in several transition metal dichalcogenides

From: K-point longitudinal acoustic phonons are responsible for ultrafast intervalley scattering in monolayer MoSe2

 

ω(M) (THz)

ω(K) (THz)

ω(K) − ω(M) (THz)

MoSe2

LA

4.76

4.79

0.04

ZA

3.95

4.03

0.08

TA

3.21

3.63

0.42

WSe2

LA

3.84

4.22

0.38

ZA

3.62

3.69

0.06

TA

2.91

2.93

0.0

MoS2

LA

7.05

7.05

0.00

ZA

5.16

5.40

0.24

TA

4.67

5.51

0.85

WS2

LA

5.32

5.52

0.20

ZA

4.28

4.29

0.02

TA

3.90

4.44

0.54

  1. ω(M) and ω(K) denote the phonon frequencies at the M and K points and ω(K) − ω(M) are their frequency differences, in THz. Frequency differences lower than the frequency resolution of conventional femtosecond pump-probe measurements (typically, 0.1 THz = 0.4 meV) are marked in bold.
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