Gauge invariance beyond the electric dipole approximation
Gauge invariance beyond the electric dipole approximation
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DOI：
10.1103/physreva.98.063410
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发表时间：
2018-06
影响因子：
2.9
通讯作者：
Ryoji Anzaki;Y. Shinohara;Takeshi Sato;K. Ishikawa
中科院分区：
文献类型：
--
作者：
Ryoji Anzaki;Y. Shinohara;Takeshi Sato;K. Ishikawa
研究了激光与物质相互作用的规范不变性。速度规的矢量位是扩大到$n$阶相对于空间坐标，和长度规的电场和磁场分别扩大到$n$阶和$（n-1）$阶，相互规范变换，描述物理上等效的情况。后者包括最多2 ^{n+1}$极的电相互作用和2 ^n $极的磁相互作用以及两个额外的项。这一发现有助于发展一致的非微扰模拟方法超越电偶极子近似。
We study the gauge invariance of laser-matter interaction. The velocity gauge where the vector potential is expanded to the $n$-th order with respect to the spatial coordinate, and the length gauge where the electric and magnetic fields are expanded to the $n$-th and $(n-1)$-th orders, respectively, are mutually gauge-transformed, describing the physically equivalent situation. The latter includes up to the electric $2^{n+1}$-pole and magnetic $2^n$-pole interactions as well as two extra terms. The finding serves to develop consistent nonperturbative simulation methods beyond the electric dipole approximation.