Detection of both optical polarization and coherence transfers to excitonic valley states in CVD-grown monolayer MoS2
Detection of both optical polarization and coherence transfers to excitonic valley states in CVD-grown monolayer MoS2
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DOI：
10.7567/1882-0786/ab21a8
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发表时间：
2019-05
影响因子：
2.3
通讯作者：
Eito Asakura;Masaki Suzuki;S. Karube;J. Nitta;K. Nagashio;M. Kohda
中科院分区：
文献类型：
--
作者：
Eito Asakura;Masaki Suzuki;S. Karube;J. Nitta;K. Nagashio;M. Kohda
我们的实验证明，在近共振激发下，在偏振光致发光的CVD生长的单层二硫化钼激子谷偏振和相干的产生和检测。在T = 20 K时，当激发能量比A激子能量高37 meV时，通过接近A激子能量的圆形和线性光激发，分别观察到54%和32%的谷偏振和相干性。通过调节光的偏振态和光激发的偏振面，系统地控制了谷偏振及其相干性。这表明激子谷二能级系统的相干控制，谷量子信息的重要一步。
We experimentally demonstrate the generation and detection of both excitonic valley polarization and coherence in CVD-grown monolayer MoS2 under nearly resonant excitation in polarized photoluminescence. By circular and linear photoexcitation close to the A-exciton energy, where the excitation energy is 37 meV above the A-exciton energy, 54% and 32% of valley polarization and coherence, respectively, are observed at T = 20 K. By tuning the optical polarization and the polarization plane of photoexcitation, valley polarization and its coherence are systematically controlled. This indicates the coherent control of an excitonic valley two-level system, an important step for valley quantum information.