2020
DOI: 10.1103/physrevb.102.054103
|View full text |Cite
|
Sign up to set email alerts
|

Tailoring the phase transition and electron-phonon coupling in 1TMoTe2 by charge doping: A Raman study

Help me understand this report
View preprint versions

Search citation statements

Order By: Relevance

Paper Sections

Select...
4
1

Citation Types

12
42
1

Year Published

2020
2020
2023
2023

Publication Types

Select...
8

Relationship

1
7

Authors

Journals

citations
Cited by 32 publications
(55 citation statements)
references
References 66 publications
12
42
1
Order By: Relevance
“…It has in fact been reported that due to the change of symmetry from 1T′ to T d structure, this phase transition is also accompanied by a splitting of the A g peak at 129 cm –1 (also known as the P 6 peak), in P 6A and P 6B peaks. 77 Similar to the Raman spectra reported for bulk 1T′-MoTe 2 , 76 in Figure 5 c this splitting is visible (red and green fitting curves), suggesting that at temperatures lower than 223 K the phase is T d . To the best of our knowledge, such a phase transition was not yet observed on pristine monolayer 1T′-MoTe 2 .…”
Section: Resultssupporting
confidence: 80%
See 1 more Smart Citation
“…It has in fact been reported that due to the change of symmetry from 1T′ to T d structure, this phase transition is also accompanied by a splitting of the A g peak at 129 cm –1 (also known as the P 6 peak), in P 6A and P 6B peaks. 77 Similar to the Raman spectra reported for bulk 1T′-MoTe 2 , 76 in Figure 5 c this splitting is visible (red and green fitting curves), suggesting that at temperatures lower than 223 K the phase is T d . To the best of our knowledge, such a phase transition was not yet observed on pristine monolayer 1T′-MoTe 2 .…”
Section: Resultssupporting
confidence: 80%
“…A splitting of the peak at 129 cm –1 is visible, a signature of MoTe 2 phase transition. 77 The peak at 270 cm –1 confirms the monolayer nature of the crystal under study. 14 All the temperature-dependent measurements are performed at ambient pressure, in a dry nitrogen environment.…”
Section: Resultssupporting
confidence: 52%
“…Raman spectroscopy is an experimental technique which is directly sensitive to the crystal structure. [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ] Previous Raman spectroscopy studies of the bulk 1 T ′‐MoTe 2 crystals indicate that in the high‐temperature 1 T ′ phase at T ≥ 250 K upon cooling (or at T ≥ 260 K upon warming), the out‐of‐plane vibration mode D around 125 cm –1 is Raman in‐active (i.e., only infrared active) and is absent in the Raman spectra due to the centrosymmetry of the monoclinic 1 T ′ structure, while in the low‐temperature T d phase at T < 250 K upon cooling (or at T < 260 K upon warming), the out‐of‐plane vibration mode D becomes both Raman‐ and infrared‐active and can be probed by Raman spectroscopy owing to the centrosymmetry breaking in the orthorhombic T d structure (see the two vibration modes D and E in the Raman spectra of the MoTe 2 bulk crystal with the orthorhombic T d structure measured at T = 80 K in Figure 2 a , the vibration mode e in the Raman spectra of the MoTe 2 bulk crystal with the monoclinic 1 T ′ structure at T = 300 K in Figure 2b , and the Raman spectra of the MoTe 2 bulk crystal in the energy range from 60 to 300 cm –1 in Figure S1 , Supporting Information). [ 35 , 36 , 37 , 38 , 39 , 40 ] Thus, the presence of the out‐of‐plane vibration mode D can be regarded as a spectroscopic signature of the temperature‐driven structural phase transition in MoTe 2 from the high‐temperature monoclinic 1 T ′ structure to the low‐temperature orthorhombic T d structure.…”
Section: Resultsmentioning
confidence: 99%
“…The effect of unintentional hole doping will be more in the thin samples due to relative increase in surface area and stabilize the 1T phase [43]. Paul et al [46] show that 2 to 5 layers of MoTe 2 are in 1T phase at room temperature as indicated by the 130cm −1 Raman mode [25][26][27]. By electron doping these samples using NH 3 exposure, the 130cm −1 mode show splitting, indicative of the T d phase [25][26][27].…”
Section: Resultsmentioning
confidence: 99%