Evidence of abnormal hot carrier thermalization at van Hove singularity of twisted bilayer graphene

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外文摘要：Interlayer twist evokes revolutionary changes to the optical and electronic properties of twisted bilayer graphene(TBG)for electronics,photonics and optoelectronics.Although the ground state responses in TBG have been vastly and clearly studied,the dynamic process of its photoexcited carrier states mainly remains elusive.Here,we unveil the photoexcited hot carrier dynamics in TBG by time-resolved ultrafast photoluminescence(PL)autocorrelation spectroscopy.We demonstrate the unconventional ultrafast PL emission between the van Hove singularities(VHSs)with a～4 times prolonged relaxation lifetime.This intriguing photoexcited carrier behavior is ascribed to the abnormal hot carrier thermalization brought by bottleneck effects at VHSs and interlayer charge distribution process.Our study on hot carrier dynamics in TBG offers new insights into the excited states and correlated physics of graphene twistron-ics systems.

外文关键词：

Twisted bilayer graphenevan Hove singularityUltrafast photoluminescenceHot carrier dynamics

作者：

Nianze Shang、Chen Huang、Qing Chen、Chang Liu、Guangjie Yao、Zhipei Sun、Sheng Meng、Kaihui Liu、Hao Hong

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作者单位：

State Key Laboratory for Mesoscopic Physics,Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China

QTF Centre of Excellence,Department of Electronics and Nanoengineering,Aalto University,Espoo 02150,Finland

Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

Songshan Lake Materials Lab,Institute of Physics,Chinese Academy of Sciences,Dongguan 523808,China

Interdisciplinary Institute of Light-Element Quantum Materials and Research Centre for Light-Element Advanced Materials,Peking University,Beijing 100871,China

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基金：

National Key R&D Program of ChinaNational Key R&D Program of ChinaNational Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Major Project of Basic and Applied Basic ResearchStrategic Priority Research Program of Chinese Academy of SciencesPearl River Talent Recruitment Program of Guangdong ProvinceNew Cornerstone Science Foundation through the XPLORER PRIZE

项目编号：

2021YFA14002012022YFA14035042021YFB32003032021YFA1400502T21881015202502351991342520210069216320611888101123741672021B0301030002XDB330000002019ZT08C321

出版年：

2024

DOI：

10.1016/j.scib.2024.06.019

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

年,卷(期)：2024.69(16)