Magnetic-field-induced fourfold azimuthal angle dependence in the terahertz radiation power of (100) InAs
Magnetic-field-induced fourfold azimuthal angle dependence in the terahertz radiation power of (100) InAs
复制标题
DOI：
10.1063/1.2721385
复制
发表时间：
2007-04
影响因子：
4
通讯作者：
E. Estacio;H. Sumikura;H. Murakami;M. Tani;N. Sarukura;M. Hangyo;C. Ponseca;R. Pobre;R. Quiroga;S. Ono
中科院分区：
文献类型：
--
作者：
E. Estacio;H. Sumikura;H. Murakami;M. Tani;N. Sarukura;M. Hangyo;C. Ponseca;R. Pobre;R. Quiroga;S. Ono
研究了1T磁场下（100）InAs的太赫兹辐射功率与方位角的关系。结果表明，虽然主要的辐射机制是浪涌电流，方位角依赖的辐射，由于非线性效应也观察到。将p偏振太赫兹辐射功率的二重对称性修改为与横向磁场的四重对称性。此外，即使没有施加电场，s偏振太赫兹功率的结果也表现出四重对称性。初步提出了光生载流子的各向异性谷间散射是四极响应和四重发射对称性的起源。
The azimuthal angle dependence in the terahertz radiation power of (100) InAs under 1T magnetic field is presented. Results show that although the dominant radiation mechanism is surge current, azimuthal-angle-dependent radiation due to the nonlinear effect is also observed. The twofold symmetry of the p-polarized terahertz radiation power was modified to a fourfold symmetry with the transverse magnetic field. Moreover, results exhibited fourfold symmetry for the s-polarized terahertz power even with no applied field. The anisotropic intervalley scattering of photocarriers is tentatively proposed as the origin of quadrupole response and the fourfold emission symmetry.