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Intravalley scattering probed by excitation energy dependence of valley polarization in monolayer MoS2
Journal of Physics D: Applied Physics ( IF 3.4 ) Pub Date : 2021-09-06 , DOI: 10.1088/1361-6463/ac1626
Eito Asakura 1 , Takeshi Odagawa 1 , Masaki Suzuki 1 , Shutaro Karube 1, 2 , Junsaku Nitta 1, 2, 3 , Makoto Kohda 1, 2, 3, 4
Affiliation  

Steady-state valley polarization caused by polarized photoexcitation at various excitation energies reveals intravalley scattering from B excitons to A excitons in a monolayer of MoS2. When the excitation energy of circularly polarized light is increased from near the level of excitation of the A exciton, the valley polarization detected in the A exciton decreases monotonously and is completely suppressed due to phonon-mediated scattering. However, excitation to levels greater than the B-exciton energy recovers the valley polarization in the A exciton. By considering the suppressed valley coherence and the sign of the valley polarization, together with the higher energy shift of the recovered peak polarization of B-exciton resonance, we find that the polarization recovery originates from the phonon-mediated intravalley scattering from B excitons to A excitons in the same valley.



中文翻译:

通过单层 MoS2 中谷极化的激发能量依赖性探测谷内散射

由不同激发能量的偏振光激发引起的稳态谷极化揭示了 MoS 2单层中从 B 激子到 A 激子的谷内散射. 当圆偏振光的激发能量从 A 激子的激发能级附近增加时,在 A 激子中检测到的谷偏振单调减少,并由于声子介导的散射而被完全抑制。然而,激发到大于 B 激子能量的水平会恢复 A 激子中的谷极化。通过考虑抑制的谷相干性和谷极化的符号,以及 B 激子共振的恢复峰值极化的更高能量偏移,我们发现极化恢复源自声子介导的从 B 激子到 A 的谷内散射激子在同一个山谷。

更新日期:2021-09-06
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