Optical third harmonic generation in black phosphorus
Optical third harmonic generation in black phosphorus
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DOI：
10.1103/physrevb.97.035431
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发表时间：
2017-08
期刊：
影响因子：
--
通讯作者：
F. Hipólito;T. Garm
中科院分区：
文献类型：
--
作者：
F. Hipólito;T. Garm
我们提出了一种利用长度规计算两带系统三次谐波(THG)的方法，避免了在计算三阶电流密度响应时出现的非物理发散。采用非正交紧束缚模型对块状和单层黑磷(BP)进行了计算。结果表明，低能响应以混合带内过程为主，对THG磁化率的估计与最近对BP大块样品的实验报告相当。
We present a calculation of Third Harmonic Generation (THG) for two-band systems using the length gauge that avoids unphysical divergences otherwise present in the evaluation of the third order current density response. The calculation is applied to bulk and monolayer black Phosphorus (bP) using a non-orthogonal tight-binding model. Results show that the low energy response is dominated by mixed inter-intraband processes and estimates of the magnitude of THG susceptibility are comparable to recent experimental reports for bulk bP samples.