Exciton broadening in WS2/graphene heterostructures

被引：51
作者：
Hill, Heather M. [1 ,2 ,3 ,4 ,5 ]
Rigosi, Albert F. [1 ,2 ,3 ,4 ,5 ]
Raja, Archana [1 ,2 ,3 ,4 ,5 ]
Chernikov, Alexey [1 ,2 ,3 ,4 ,6 ]
Roquelet, Cyrielle [1 ,2 ,3 ,4 ,7 ]
Heinz, Tony F. [1 ,2 ,3 ,4 ,5 ]
机构：
[1] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA
[2] Columbia Univ, Dept Elect Engn, New York, NY 10027 USA
[3] Columbia Univ, Dept Chem, New York, NY 10027 USA
[4] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
[5] SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA
[6] Univ Regensburg, Dept Phys, D-93053 Regensburg, Germany
[7] ArcelorMittal Maizieres Res SA, Maizires Les Metz, France
来源：
PHYSICAL REVIEW B | 2017年 / 96卷 / 20期
基金：
美国国家科学基金会;
关键词：
ENERGY-TRANSFER; CHARGE-TRANSFER; MONOLAYER MOS2; VALLEY POLARIZATION; ELECTRIC-FIELD; SINGLE; GRAPHENE; STATES; WS2; PHOTOLUMINESCENCE;
D O I：
10.1103/PhysRevB.96.205401
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have used optical spectroscopy to observe spectral broadening of WS2 exciton reflectance peaks in heterostructures of monolayer WS2 capped with mono- to few-layer graphene. The broadening is found to be similar for the A and B excitons and on the order of 5-10 meV. No strong dependence on the number of graphene layers was observed within experimental uncertainty. The broadening can be attributed to charge- and energy-transfer processes between the two materials, providing an observed lower bound for the corresponding time scales of 65 fs.
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页数：7
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