带间与带内电流在激光与双色准周期晶体相互作用中的作用
Role of inter- and intraband current in laser interaction with bi-chromatic quasi-periodic crystals
AI总结：
本文通过求解k空间含时薛定谔方程，研究双色准周期晶体中带间与带内电流在激光相互作用中的作用，揭示了特定双色势比下布里渊区中心或边缘的选择性带间跃迁和粒子数转移机制，并分析了高阶谐波产生特性。
摘要：
我们研究了带间电流和带内电流在激光与双色准周期晶体相互作用中的作用。通过在k空间中求解含时薛定谔方程来模拟相互作用动力学，并以规范不变形式获得带间电流和带内电流的时间演化。我们观察到，对于某些双色势比，'价带'和'导带'的能带结构仅在布里渊区中心或边缘促进带间跃迁，这导致能带之间出现一种非常有趣的粒子数转移机制。带间电流和带内电流的时间分布详细描述了相互作用过程。我们还研究了这些双色光学晶格中的高阶谐波产生（HHG），并对所得的谐波产率进行了评述。
英文摘要：
We study the role of the inter- and intraband current in the laser interaction with the bi-chromatic quasi-periodic crystals. The interaction dynamics are simulated by solving the time-dependent Schrödinger equation in the $k$-space, and time evolution of the inter- and intraband current is obtained in a gauge invariant form. We observed that for certain bi-chromatic potential ratios, the energy band structure of the `valence band' and the `conduction band' facilitate the interband transitions only at the center or at the edge of the Brillouin zone, which leads to a very interesting population transfer mechanism between the bands. The temporal profile of the inter- and intraband current gives a detailed account of the interaction. The higher-order harmonic generation (HHG) is also studied for these bi-chromatic optical lattices, and the resultant harmonic yield is commented upon.
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