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首页> 外文期刊>Physical review >Resonant Raman scattering at exciton states tuned by pressure and temperature in 2H-MoS_2
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Resonant Raman scattering at exciton states tuned by pressure and temperature in 2H-MoS_2

机译：在2H-MoS_2中通过压力和温度调节的激子状态下的共振拉曼散射

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摘要

We report on the temperature and pressure dependence of Stokes and anti-Stokes Raman spectra of a single crystal of 2H-MoS_2 as the energies of the A_1 and B_1 excitons, E_(A1) and E_(B1), are tuned to resonate with an exciting laser at E_L= 1.96 eV. Pressure- and temperature-dependent intensity ratio analysis of the resonant A_(lg) phonon and the E_(2g)~1 phonon is complemented by the calculation of resonance Raman probability profiles of the former, which well agree with experiments. The temperature-dependent proximity of E_(A1) and E_(B1) to E_L is reflected in the formation of Stokes dominated A_1 and anti-Stokes dominated B_1 temperature "zones" with a midpoint positioned at T～260 K. The shift in the frequency of the Stokes two-phonon dispersive band relative to that of the anti-Stokes band is explained as due to changing in the order of participation of the quasiacoustic phonon in the scattering process.
机译：我们报告了2H-MoS_2单晶的Stokes和反Stokes拉曼光谱对温度和压力的依赖性，因为A_1和B_1激子的能量E_（A1）和E_（B1）被调谐到与E_L = 1.96 eV的激发激光。共振A_（lg）声子和E_（2g）〜1声子的压力和温度相关强度比分析通过前者共振拉曼概率分布的计算得到补充，这与实验非常吻合。 E_（A1）和E_（B1）与E_L的温度相关性接近反映在斯托克斯为主的A_1和反斯托克斯为主的B_1温度“区域”的形成，其中点位于T〜260K。斯托克斯二声子色散带相对于反斯托克斯谱带的频率被解释为是由于准声子声子在散射过程中参与顺序的变化引起的。

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