Second harmonic generation in graphene dressed by a strong terahertz field
Second harmonic generation in graphene dressed by a strong terahertz field
复制标题
由强太赫兹场修饰的石墨烯中的二次谐波产生
DOI：
10.1103/physrevb.99.155411
复制
发表时间：
2018
影响因子：
3.7
通讯作者：
A. Stepanov
中科院分区：
文献类型：
--
作者：
M. Tokman;S. Bodrov;Y. Sergeev;A. I. Korytin;I. Oladyshkin;Yongrui Wang;A. Belyanin;A. Stepanov
我们观察到增强的二次谐波产生在单层石墨烯中的存在下的超强太赫兹场脉冲的峰值振幅为250 kV/cm。这是一种强非微扰的光-物质相互作用机制，其中粒子在几飞秒的时间尺度内被加速到超过初始费米能量0.2 eV的能量。当电子漂移通过对应于光学频率下的带间跃迁共振的动量区域时，产生二次谐波电流。由此产生的强烈的不对称失真的载流子分布在动量空间中引起增强的电偶极子非线性响应在二次谐波。我们开发了一个近似的分析理论，这种效果准确地预测观察到的强度和偏振的二次谐波信号。
We observe enhanced second-harmonic generation in monolayer graphene in the presence of an ultra-strong terahertz field pulse with a peak amplitude of 250 kV/cm. This is a strongly nonperturbative regime of light-matter interaction in which particles get accelerated to energies exceeding the initial Fermi energy of 0.2 eV over a timescale of a few femtoseconds. The second-harmonic current is generated as electrons drift through the region of momenta corresponding to interband transition resonance at an optical frequency. The resulting strongly asymmetric distortion of carrier distribution in momentum space gives rise to an enhanced electric-dipole nonlinear response at the second harmonic. We develop an approximate analytic theory of this effect which accurately predicts observed intensity and polarization of the second-harmonic signal.
影响因子：
8.6
作者：
S. A. Mikhailov
通讯作者：
S. A. Mikhailov
影响因子：
8.6
作者：
Hendry, E.;Hale, P. J.;Mikhailov, S. A.
通讯作者：
Mikhailov, S. A.