TY - JOUR
T1 - Electron-phonon interactions in MoS2 probed with ultrafast two-dimensional visible/far-infrared spectroscopy
AU - Guo, Xunmin
AU - Chen, Hailong
AU - Wen, Xiewen
AU - Zheng, Junrong
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2015/6/7
Y1 - 2015/6/7
N2 - An ultrafast two-dimensional visible/far-IR spectroscopy based on the IR/THz air biased coherent detection method and scanning the excitation frequencies is developed. The method allows the responses in the far-IR region caused by various electronic excitations in molecular or material systems to be observed in real time. Using the technique, the relaxation dynamics of the photo-excited carriers and electron/phonon coupling in bulk MoS2 are investigated. It is found that the photo-generation of excited carriers occurs within two hundred fs and the relaxation of the carriers is tens of ps. The electron-phonon coupling between the excitations of electrons and the phonon mode E1u of MoS2 is also directly observed. The electron excitation shifts the frequency of the phonon mode 9 cm-1 higher, resulting in an absorption peak at 391 cm-1 and a bleaching peak at 382 cm-1. The frequency shift diminishes with the relaxation of the carriers.
AB - An ultrafast two-dimensional visible/far-IR spectroscopy based on the IR/THz air biased coherent detection method and scanning the excitation frequencies is developed. The method allows the responses in the far-IR region caused by various electronic excitations in molecular or material systems to be observed in real time. Using the technique, the relaxation dynamics of the photo-excited carriers and electron/phonon coupling in bulk MoS2 are investigated. It is found that the photo-generation of excited carriers occurs within two hundred fs and the relaxation of the carriers is tens of ps. The electron-phonon coupling between the excitations of electrons and the phonon mode E1u of MoS2 is also directly observed. The electron excitation shifts the frequency of the phonon mode 9 cm-1 higher, resulting in an absorption peak at 391 cm-1 and a bleaching peak at 382 cm-1. The frequency shift diminishes with the relaxation of the carriers.
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U2 - 10.1063/1.4921573
DO - 10.1063/1.4921573
M3 - RGC 21 - Publication in refereed journal
SN - 0021-9606
VL - 142
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 21
M1 - 212447
ER -