| ATOMIC AND MOLECULAR PHYSICS |
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Decoherence Effects of Terahertz Generation in Solids under Two-Color Femtosecond Laser Fields |
| Qifang Peng†, Zhaoyang Peng†, Yue Lang, Yalei Zhu, Dongwen Zhang, Zhihui Lü, and Zengxiu Zhao* |
| Department of Physics, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China |
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| Cite this article: |
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Qifang Peng, Zhaoyang Peng, Yue Lang et al 2022 Chin. Phys. Lett. 39 053301 |
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Abstract We theoretically investigate terahertz emission from solid materials pumped by intense two-color femtosecond laser field in the presence of decoherence effects. Quantum-mechanical simulations are based on the length gauge semiconductor Bloch equations describing the optical excitation and decoherence with phenomenological dephasing and depopulation times. Contributions of interband and intraband mechanisms are identified in time domain, and the latter has dominated THz generation in solid-state systems. It is found that dephasing is crucial for enhancing asymmetric intraband current and deduced that solid-state materials with short dephasing time and long depopulation time would be optimal selection for strong-field terahertz generation experiments.
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Received: 16 March 2022
Published: 29 April 2022
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| PACS: |
33.20.Xx
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(Spectra induced by strong-field or attosecond laser irradiation)
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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42.65.-k
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(Nonlinear optics)
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