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Stronger Interlayer Interactions Contribute to Faster Hot Carrier Cooling of Bilayer Graphene under Pressure
Kun Ni1, Jinxiang Du1, Jin Yang2
1Hefei 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.
Abstract:
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.
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