石墨烯中的量子光磁学
Quantum Optomagnetics in Graphene
AI总结：
本研究针对石墨烯的光磁效应问题，建立了逆法拉第效应的单粒子量子力学模型，推导了直流磁化解析表达式并预测了可测的偏振旋转角，为石墨烯量子光磁学研究提供了理论支撑。
摘要：
石墨烯可通过其轨道角动量对强圆偏振光的非线性响应实现磁化。这种光磁效应可由逆法拉第效应（Inverse Faraday Effect, IFE）很好地例证，该效应中光生直流磁化会引发石墨烯的光学活性。我们通过在圆偏振单色光作用下求解狄拉克点附近重整化哈密顿量对应的薛定谔方程，建立了石墨烯中逆法拉第效应的单粒子量子力学模型。我们基于准电子的非微扰缀饰态推导了直流磁化的解析表达式，其中圆偏振光使准电子的能谱产生各向同性的带隙。随后我们通过旋电双折射计算了旋光率，预测在中等及强光学辐射下可测得可观测的偏振旋转角。
英文摘要：
Graphene can be magnetized through nonlinear response of its orbital angular momentum to an intense circularly polarized light. This optomagnetic effect can be well exemplified by the Inverse Faraday Effect (IFE) where an optically-generated DC magnetization leads to graphene's optical activity. We provide a single-particle quantum mechanical model of an IFE in graphene by solving Schrödinger's equation in the presence of a renormalized Hamiltonian near a Dirac point in the presence of circularly polarized monochromatic light. We derive an analytical expression for DC magnetization based on non-perturbative and dressed states of quasi-electrons where their energy spectrum is isotropically gapped by the circularly polarized light. Optical rotatory power is then computed through the gyroelectric birefringence where a measurable polarization rotation angle under moderate and intense optical radiations is predicted.
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