Temperature dependence of the double‐resonance Raman bands in monolayer MoS₂

Abstract

This work reports a detailed study of the double‐resonance (DR) Raman bands of single‐layer MoS2 as a function of temperature, using many different laser energies in the region of the excitonic transitions and at different temperatures between 80 and 300 K. Our measurements show that the DR bands are strongly affected by temperature and the results are explained in terms of the temperature dependence of both the phonon wavenumber and the excitonic energy. In order to distinguish these two effects, the excitonic transitions were directly measured by photoluminescence as a function of temperature. It was observed from the multiple‐excitation results that the dispersion of the DR bands measured with different laser lines depends on temperature. The resonance condition was evidenced by considering the difference between energies of the laser excitation and the excitonic transition, at a given temperature. Our findings for the temperature dependence of the DR process in single‐layer MoS2 can be extended to other classes of transition metal dichalcogenide materials.

Pressure-engineered optical properties and emergent superconductivity in chalcopyrite semiconductor ZnSiP2

“…Based on the data of ref. 2 a value of~1.4 eV at 300 K is obtained by extrapolation according to the approximate model for temperature-dependent PL spectra 28,29 . These results consistently confirm the high quality of our samples.…”

Spectroscopic Study of the Excitonic Structure in Monolayer MoS2 under Multivariate Physical and Chemical Stimuli

“…2.012 AE 0.053 [29,32,48,96,[102][103][104][105][106][107] 0.135 AE 0.04 [29,32,48,96,[102][103][104][105][106][107] A 1s 1.875 AE 0.025 [29,32,48,96,[102][103][104][105][106][107] - [29,32,48,96,[102][103][104][105][106][107] 0.036 AE 0.009 [29,32,48,96,[102][103][104][105][106][107] A XX -- [29,32,…”

Recent advances in linear and nonlinear Raman spectroscopy. Part XIV

“…They state that their work may provide valuable insights into the laser‐induced phase transition in MoTe 2 and be helpful for phase transitions in other transition metal disulfides. Gontijo et al [ 85 ] explored the temperature dependence of the double‐resonance Raman bands in monolayer MoS 2 . Their findings for the temperature dependence of the double resonance process in single‐layer MoS 2 can be extended to other classes of transition metal dichalcogenide materials.…”