论文标题
非手续金属卤化物钙钛矿中的圆二色性
Circular dichroism in non-chiral metal halide perovskites
论文作者
论文摘要
从理论上讲，我们证明了非手性钙钛矿层在没有磁场的情况下可以表现出圆形二色性（CD），并且没有手性分子的手性激活。该效果被证明是由于螺旋激素状态的分裂，这些状态可以在表现出rashba旋转效应的正交或较低对称性的结构中形成。这些螺旋激子状态与螺旋光的选择性耦合显示出引起圆形二科运动。由于RashBA分裂，面内对称性破裂以及激动子动量对其细胞结构的影响，依赖于极化依赖性吸收是由于RashBA分裂的综合作用而发生的，该结构以有效的磁场中的Zeeman分裂形式。我们计算出明显的CD，其各向异性因子在正常的顶部照明条件下的正常钙钛矿层中高达30％，从而提高了其在非手续钙钛矿结构中观察到的可能性。
We demonstrate theoretically that non-chiral perovskite layers can exhibit circular dichroism (CD) in the absence of a magnetic field and without chiral activation by chiral molecules. The effect is shown to be due to splitting of helical excitonic states which can form in structures of orthorhombic or lower symmetry that exhibit Rashba spin effects. The selective coupling of these helical exciton states to helical light is shown to give rise to circular dichroism. Polarization dependent absorption is shown to occur due to the combined effect of Rashba splitting, in-plane symmetry breaking, and the effect of the exciton momentum on its fine structure, which takes the form of Zeeman splitting in an effective magnetic field. We calculate significant CD with an anisotropy factor of up to 30% in orthorhombic perovskite layers under off-normal top illumination conditions, raising the possibility of its observation in non-chiral perovskite structures.
