Self-energy dynamics and mode-specific phonon threshold effect in a Kekulé-ordered graphene
Kekulé-ordered graphene의 자체 에너지 역학 및 모드별 포논 임계값 효과
Dinámica de la energía propia y efecto de umbral de fonón específico del modo en un grafeno ordenado por Kekulé
Dynamique de l'auto-énergie et effet de seuil de phonon spécifique au mode dans un graphène d'ordre de Kekulé
Собственноэнергетическая динамика и модовый пороговый эффект фононов в упорядоченном по Кекуле графене
Hongyun Zhang 张红云 ¹, Changhua Bao 鲍昌华 ¹, Michael Schüler ², Shaohua Zhou 周绍华 ¹, Qian Li 李骞 ¹, Laipeng Luo 罗来鹏 ¹, Wei Yao 姚维 ¹, Zhong Wang ³, Thomas P Devereaux ² ⁴, Shuyun Zhou 周树云 ¹ ⁵
¹ State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P.R. China
中国 北京 清华大学物理系 低维量子物理国家重点实验室
² Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
³ Institute for Advanced Study, Tsinghua University, Beijing, 100084, P. R. China
中国 北京 清华大学高等研究院
⁴ Department of Materials Science and Engineering, Stanford University, Stanford, CA 94035, USA
⁵ Frontier Science Center for Quantum Information, Beijing 100084, P. R. China
中国 北京 清华大学量子信息前沿科学中心
National Science Review, 16 September 2021

Electron-phonon interaction and related self-energy are fundamental to both the equilibrium properties and non-equilibrium relaxation dynamics of solids. Although electron-phonon interaction has been suggested by various time-resolved measurements to be important for the relaxation dynamics of graphene, the lack of energy- and momentum-resolved self-energy dynamics prohibits direct identification of the role of specific phonon modes in the relaxation dynamics.

Here by performing time- and angle-resolved photoemission spectroscopy measurements on a Kekulé-ordered graphene with folded Dirac cones at the Γ point, we have succeeded in resolving the self-energy effect induced by coupling of electrons to two phonons at Ω1 = 177 meV and Ω2 = 54 meV and revealing its dynamical change in the time domain. Moreover, these strongly coupled phonons define energy thresholds, which separate the hierarchical relaxation dynamics from ultrafast, fast to slow, thereby providing direct experimental evidence for the dominant role of mode-specific phonons in the relaxation dynamics.
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