三蝶烯分子膜的动量选择性光吸收
Momentum selective optical absorption in triptycene molecular membrane
摘要：
对三蝶烯分子膜在线偏振光和圆偏振光照射下的光学性质进行了理论研究。由于TdR具有用于其$π$ -电子的双层Kagome晶格结构，即，镶嵌的三角形和六角对称环，电子能带结构的TdR具有非等效的狄拉克锥和完美的平坦带。通过构建描述TMM π电子态的紧束缚模型，基于Kubo公式计算了TMM的光吸收强度和谷选择激发。结果表明，吸收强度主要取决于光的偏振角和激发在动量空间中的位置，即，动量和谷值选择性光激发。利用群论分析阐明了光的偏振依赖性和光选择规则。
英文摘要：
The optical properties of triptycene molecular membranes (TMMs) under the linearly and circularly polarized light irradiation have been theoretically studied. Since TMMs have the double-layered Kagome lattice structures for their $π$-electrons, i.e., tiling of trigonal and hexagonal-symmetric rings, the electronic band structures of TMMs have non-equivalent Dirac cones and perfect flat bands. By constructing the tight-binding model to describe the pi-electronic states of TMMs, we have evaluated the optical absorption intensities and valley selective excitation of TMMs based on the Kubo formula. It is found that absorption intensities crucially depend on both light polarization angle and the excitation position in momentum space, i.e., the momentum and valley selective optical excitation. The polarization dependence and optical selection rules are also clarified by using group theoretical analyses.
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