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Recoil Effect and Photoemission Splitting of Trions in Monolayer MoS2
ACS Nano ( IF 15.8 ) Pub Date : 2017-11-13 00:00:00 , DOI: 10.1021/acsnano.7b03457 Qicheng Zhang 1 , Carl H. Naylor 2 , Zhaoli Gao 2 , Ruizhe Wu 1 , Irfan Haider Abidi 1 , Meng-Qiang Zhao 2 , Yao Ding 1 , Aldrine Abenoja Cagang 1 , Minghao Zhuang 1 , Xuewu Ou 1 , Zhengtang Luo 1
ACS Nano ( IF 15.8 ) Pub Date : 2017-11-13 00:00:00 , DOI: 10.1021/acsnano.7b03457 Qicheng Zhang 1 , Carl H. Naylor 2 , Zhaoli Gao 2 , Ruizhe Wu 1 , Irfan Haider Abidi 1 , Meng-Qiang Zhao 2 , Yao Ding 1 , Aldrine Abenoja Cagang 1 , Minghao Zhuang 1 , Xuewu Ou 1 , Zhengtang Luo 1
Affiliation
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The 2D geometry nature and low dielectric constant in transition-metal dichalcogenides lead to easily formed strongly bound excitons and trions. Here, we studied the photoluminescence of van der Waals heterostructures of monolayer MoS2 and graphene at room temperature and observed two photoluminescence peaks that are associated with trion emission. Further study of different heterostructure configurations confirms that these two peaks are intrinsic to MoS2 and originate from a bound state and Fermi level, respectively, of which both accept recoiled electrons from trion recombination. We demonstrate that the recoil effect allows us to electrically control the photon energy of trion emission by adjusting the gate voltage. In addition, significant thermal smearing at room temperature results in capture of recoil electrons by bound states, creating photoemission peak at low doping level whose photon energy is less sensitive to gate voltage tuning. This discovery reveals an unexpected role of bound states for photoemission, where binding of recoil electrons becomes important.
中文翻译：
单层MoS 2中Tri的反冲效应和光发射分裂
过渡金属二卤化物中的2D几何性质和低介电常数会导致容易形成牢固结合的激子和三子。在这里，我们研究了室温下单层MoS 2和石墨烯的范德华力异质结构的光致发光，并观察到了与三重子发射有关的两个光致发光峰。对不同异质结构构型的进一步研究证实，这两个峰是MoS 2固有的它们分别来自结合态和费米能级，它们都接受来自三重子重组的反冲电子。我们证明，反冲效应使我们能够通过调节栅极电压来电子控制tri离子发射的光子能量。此外，在室温下明显的热拖尾会导致束缚态捕获反冲电子，从而在低掺杂水平上产生光发射峰，其光子能量对栅极电压的调节较不敏感。这一发现揭示了束缚态对于光发射的出乎意料的作用，其中反冲电子的束缚变得很重要。
更新日期：2017-11-14
中文翻译：
单层MoS 2中Tri的反冲效应和光发射分裂
过渡金属二卤化物中的2D几何性质和低介电常数会导致容易形成牢固结合的激子和三子。在这里，我们研究了室温下单层MoS 2和石墨烯的范德华力异质结构的光致发光，并观察到了与三重子发射有关的两个光致发光峰。对不同异质结构构型的进一步研究证实，这两个峰是MoS 2固有的它们分别来自结合态和费米能级，它们都接受来自三重子重组的反冲电子。我们证明，反冲效应使我们能够通过调节栅极电压来电子控制tri离子发射的光子能量。此外，在室温下明显的热拖尾会导致束缚态捕获反冲电子，从而在低掺杂水平上产生光发射峰，其光子能量对栅极电压的调节较不敏感。这一发现揭示了束缚态对于光发射的出乎意料的作用，其中反冲电子的束缚变得很重要。
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