电子-声子相互作用对单层过渡金属二卤化物线性和非线性磁光吸收特性的影响

IF 1.2 4区 物理与天体物理 Q4 OPTICS Laser Physics Pub Date : 2024-06-18 DOI:10.1088/1555-6611/ad5531
Tran N Bich, Le Dinh and Huynh V Phuc
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引用次数: 0

摘要

在本研究中,我们通过评估电子-声子相互作用(EPI)影响下的磁光吸收系数(MOAC)和折射率变化(RIC),研究了 TMDC 单层半导体 MX2(M = Mo/W,X = S/Se)在垂直磁场中的线性和非线性磁光特性。考虑到电子通过吸收(AB)和发射(EM)机制与声子(AC)和光子(OP)耦合的影响,我们得出了这一结果。与忽略 EPI 的情况相比,线性 MOAC 和 RIC 的强度分别增加了约 2.6-4 倍和 5.3-10.5 倍。吸收峰出现蓝移,其中 OP-EM 声子散射的蓝移最大,其次是交流声子,而 OP-AB 声子散射的蓝移最小。同时,对 MOAC 和 RIC 贡献最大的是 OP-AB 声子,其次分别是交流声子和 OP-EM 声子。与 WX2 相比,MoX2 组受散射机制的影响更大。虽然 MoX2 组的 OP-EM 声子贡献远小于其他两种相互作用机制,但还是产生了非常明显的蓝移。同时,对于 WX2 组,所有三种机制都产生了相似的结果。线性 MOAC 和 RIC 的最大(最小)值都建立在 MoSe2(MoS2)上。值得注意的是,与不考虑 EPI 时相反,非线性 MOAC 和 RIC 项的绝对值增加了几十倍到几百倍,导致总 MOAC 项为负值,而非线性 RIC 曲线的特征也发生了很大变化。在四种 TMDC 材料中,MoX2 受 EPI 效应的影响比 WX2 更明显。
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Influence of electron–phonon interaction on linear and nonlinear magneto-optical absorption properties in monolayer transition metal dichalcogenides
In this study, we investigate the linear and non-linear magneto-optical properties of TMDC monolayer semiconductors MX2 (M = Mo/W, X = S/Se) in a perpendicular magnetic field by evaluating the magneto-optical absorption coefficients (MOACs) and the refractive index changes (RICs) subject to the influence of electron–phonon interaction (EPI). Our results are achieved by considering the influence of electron couplings with acoustic (AC) and optical (OP) phonons via the absorption (AB) and emission (EM) mechanisms. When compared to the neglected EPI case, the intensity of the linear MOAC and RIC increases about 2.6–4 times and 5.3–10.5 times, respectively. The absorption peaks exhibit the blue-shifts, with the largest blue-shift observed for the OP-EM phonon scatterings, followed by the AC phonons and the smallest for the OP-AB phonon scatterings. Meanwhile, the greatest contribution to MOAC and RIC comes from the OP-AB phonons, which is followed by that of the AC phonons and the OP-EM phonons, respectively. The MoX2 group is more significantly affected by the scattering mechanism compared to the WX2 one. Although the OP-EM phonons contribution for the MoX2 group is much smaller than that of the other two interaction mechanisms, it nevertheless produces a very noticeable blue-shift. Meanwhile, for the WX2 group, all three mechanisms erect comparable results. The biggest (smallest) value of the linear MOAC and RIC are both founded in MoSe2 (MoS2). Notably, the absolute values of the non-linear MOAC and RIC terms increase by tens to hundreds of times, leading to the total MOAC terms being negative, contrary to when EPI is not taken into account, while the characteristics of the non-linear RIC curves also undergo considerable changes. Among the four TMDC materials, MoX2 is more significantly affected by the EPI effect than WX2.
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来源期刊
Laser Physics
Laser Physics 物理-光学
CiteScore
2.60
自引率
8.30%
发文量
127
审稿时长
2.2 months
期刊介绍: Laser Physics offers a comprehensive view of theoretical and experimental laser research and applications. Articles cover every aspect of modern laser physics and quantum electronics, emphasizing physical effects in various media (solid, gaseous, liquid) leading to the generation of laser radiation; peculiarities of propagation of laser radiation; problems involving impact of laser radiation on various substances and the emerging physical effects, including coherent ones; the applied use of lasers and laser spectroscopy; the processing and storage of information; and more. The full list of subject areas covered is as follows: -physics of lasers- fibre optics and fibre lasers- quantum optics and quantum information science- ultrafast optics and strong-field physics- nonlinear optics- physics of cold trapped atoms- laser methods in chemistry, biology, medicine and ecology- laser spectroscopy- novel laser materials and lasers- optics of nanomaterials- interaction of laser radiation with matter- laser interaction with solids- photonics
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