Low-frequency interlayer phonon dynamics and photoinduced terahertz absorption in black phosphorus.

IF 3.3 2区 物理与天体物理 Q2 OPTICS
Optics express Pub Date : 2025-09-08 DOI:10.1364/OE.574206
Haiyun Huang, Cheng Chen, Yuxin Zhai, Xiu Zhang, Junzhi Zhu, Junyong Wang, Kai Zhang, Qihua Xiong, Haiyun Liu
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引用次数: 0

Abstract

The strong interlayer coupling in black phosphorus (BP), arising from wavefunction overlap between layers, is critical for understanding its electronic and optical properties. Here, we utilize terahertz (THz) spectroscopy to study phonon dynamics in BP. We identify two peaks at 6 and 8.5 meV in steady-state THz spectra, which are attributed to low-frequency interlayer phonon modes. Both modes exhibit anharmonic phonon coupling behavior below 150 K, manifesting as temperature-dependent red shifts. Using time-resolved THz spectroscopy, we observe significantly increased THz absorption under photoexcitation, arising from the transient enhancements of the extended Drude component and the oscillator strengths of interlayer phonons in non-equilibrium. These findings highlight the critical role of interlayer phonon dynamics in understanding many-body physics in BP.

黑磷中低频层间声子动力学和光诱导太赫兹吸收。
黑磷(BP)中由层间波函数重叠引起的层间强耦合对于理解其电子和光学性质至关重要。在这里,我们利用太赫兹(THz)光谱来研究BP中的声子动力学。我们在稳态太赫兹光谱中确定了6和8.5 meV的两个峰,这归因于低频层间声子模式。两种模式在150 K以下均表现出非调和声子耦合行为,表现为温度相关的红移。利用时间分辨太赫兹光谱,我们观察到光激发下太赫兹吸收显著增加,这是由于扩展Drude分量的瞬态增强和层间声子在非平衡状态下的振荡强度。这些发现强调了层间声子动力学在理解BP多体物理中的关键作用。
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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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