Stronger Interlayer Interactions Contribute to Faster Hot Carrier Cooling of Bilayer Graphene under Pressure,Physical Review Letters

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Stronger Interlayer Interactions Contribute to Faster Hot Carrier Cooling of Bilayer Graphene under Pressure
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-01-13 , DOI: 10.1103/physrevlett.126.027402
Kun Ni ₁ , Jinxiang Du ₁ , Jin Yang ₂ , Shujuan Xu ₂ , Xin Cong ₃ , Na Shu ₁ , Kai Zhang ₂ , Aolei Wang ₄ , Fei Wang ₁ , Liangbing Ge ₁ , Jin Zhao _{4,

5} , Yan Qu ₆ , Kostya S Novoselov ₇ , Pingheng Tan ₃ , Fuhai Su ₂ , Yanwu Zhu ₁

Affiliation

Hefei National Research Center for Physical Sciences at the Microscale, and CAS Key Laboratory of Materials for Energy Conversion, and Department of Materials Science and Engineering, and iChEM, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China.
Department of Physics, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and ICQD/Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
The Sixth Element (Changzhou) Materials Technology Co., Ltd., Changzhou 213100, China.
National Graphene Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom, Centre for Advanced 2D Materials, National University of Singapore, 117546 Singapore and Chongqing 2D Materials Institute, Liangjiang New Area, Chongqing 400714, China.

We perform femtosecond pump-probe spectroscopy to in situ investigate the ultrafast photocarrier dynamics in bilayer graphene and observe an acceleration of energy relaxation under pressure. In combination with in situ Raman spectroscopy and ab initio molecular dynamics simulations, we reveal that interlayer shear and breathing modes have significant contributions to the faster hot-carrier relaxations by coupling with the in-plane vibration modes under pressure. Our work suggests that further understanding the effect of interlayer interaction on the behaviors of electrons and phonons would be critical to tailor the photocarrier dynamic properties of bilayer graphene.

中文翻译：

更强的层间相互作用有助于加快双层石墨烯在压力下的热载流子冷却

我们进行飞秒泵浦探测光谱，以原位研究双层石墨烯中的超快光载流子动力学，并观察压力下能量弛豫的加速。结合原位拉曼光谱和从头算分子动力学模拟，我们揭示了层间剪切和呼吸模式通过与压力下的面内振动模式耦合对更快的热载流子弛豫有重要贡献。我们的工作表明，进一步了解层间相互作用对电子和声子行为的影响对于定制双层石墨烯的光载流子动力学特性至关重要。

更新日期：2021-01-14

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