通过光致发光激发光谱观察单层 MoS2 和 WS2 中的激子里德堡态。
Observation of Excitonic Rydberg States in Monolayer MoS2 and WS2 by Photoluminescence Excitation Spectroscopy.
机构信息
§Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.
出版信息
Nano Lett. 2015 May 13;15(5):2992-7. doi: 10.1021/nl504868p. Epub 2015 Apr 3.
We have identified excited exciton states in monolayers of MoS2 and WS2 supported on fused silica by means of photoluminescence excitation spectroscopy. In monolayer WS2, the positions of the excited A exciton states imply an exciton binding energy of 0.32 eV. In monolayer MoS2, excited exciton transitions are observed at energies of 2.24 and 2.34 eV. Assigning these states to the B exciton Rydberg series yields an exciton binding energy of 0.44 eV.
我们通过光致发光激发光谱法，在熔融石英上支持的 MoS2 和 WS2 单层中，识别出了激子激发态。在单层 WS2 中，激子 A 激子态的位置表明激子结合能为 0.32eV。在单层 MoS2 中，在 2.24 和 2.34eV 的能量处观察到了激子激发跃迁。将这些状态分配给 B 激子里德堡系列，得到激子结合能为 0.44eV。
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