Guo Jia, Liang Weizheng, Luo Sheng-Nian
The Peac Institute of Multiscale Sciences, Chengdu 610031, Sichuan, People's Republic of China.
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, People's Republic of China.
J Phys Chem Lett. 2020 Nov 5;11(21):9351-9357. doi: 10.1021/acs.jpclett.0c02872. Epub 2020 Oct 22.
The link between spin-phonon coupling (SPC) and coherent phonon excitation as well as hot carrier decay dynamics is investigated with femtosecond transient optical spectroscopy. Coherent phonon excitation via SPC is directly observed in a van der Waals ferromagnet CrGeTe (CGT). Such coherent phonon excitation is strongly dependent on spin ordering of CGT and facilitates considerably hot carrier decay. While hot carriers decay normally via direct electron-phonon coupling, hot carrier decay in ferromagnetic CGT is also achieved via indirect electron-phonon coupling, with spin ordering acting as the intermediate between hot carriers and coherent phonons.
