Non-parabolic effect for femtosecond laser-induced ultrafast electro-absorption in solids

doi:10.1088/1674-1056/ab577c

Abstract A theoretical study for femtosecond laser-induced ultrafast electro-absorption of bulk solids is presented. Our numerical results show that, in the case of low intensity of the pump laser where the interaction between the pump laser and solids is in the multi-photon regime, the energy band of solids can be approximately taken as a parabolic band and electro-absorption spectrums from the parabolic band and real band are nearly the same. While, in the case of high intensity where the interaction is in the tunneling regime, spectrums from the parabolic band and real band are quite different. The physical mechanism for the difference in the tunneling regime is found. We find that the non-parabolic parts of the real energy band and Bragger scattering of electrons near the first Brillouin zone boundaries, which are neglected in previous studies, strongly influence the electro-absorption spectrum in the tunneling regime. These two physical processes cause the difference of spectrums. Our theoretical results are in accordance with the experiment result.

Keywords: ultrafast electro-absorption red-shift of absorption edge Bragger scattering effect multi-photon process

Received: 05 July 2019
Revised: 05 September 2019
Accepted manuscript online:

PACS:	78.47.-p	(Spectroscopy of solid state dynamics)
	72.20.Ht	(High-field and nonlinear effects)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	78.40.Fy	(Semiconductors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61505023).

Corresponding Authors: Hong-Xiang Deng
E-mail: denghx@uestc.edu.cn

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Li-Bo Liu(刘利博), Hong-Xiang Deng(邓洪祥), Xiao-Tao Zu(祖小涛), Xiao-Dong Yuan(袁晓东), Wan-Guo Zheng(郑万国) Non-parabolic effect for femtosecond laser-induced ultrafast electro-absorption in solids 2020 Chin. Phys. B 29 017801

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[1]	Red-shift law of intense laser-induced electro-absorption in solids Deng Hong-Xiang (邓洪祥), Zu Hao-Yue (祖皓月), Wu Shao-Yi (邬邵轶), Sun Kai (孙凯), Zu Xiao-Tao (祖小涛). Chin. Phys. B, 2014, 23(2): 027801.

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Non-parabolic effect for femtosecond laser-induced ultrafast electro-absorption in solids

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