手性堆叠多层石墨烯中相互作用电子对太赫兹辐射的偏振敏感吸收
Polarization-sensitive absorption of THz radiation by interacting electrons in chirally stacked multilayer graphene
摘要：
我们发现，一个干净的多层石墨烯片的不透明度取决于螺旋的圆偏振电磁辐射。这种效应可以理解为在交换电子-电子相互作用的存在下，改变动量空间中的赝自旋织构的带间光学跃迁的赝自旋选择规则。半解析Hartree-Fock方法中描述的相互作用导致形成拓扑上不同的对称性破缺状态，其特征在于陈数和零场异常霍尔电导率。
英文摘要：
We show that opacity of a clean multilayer graphene flake depends on the helicity of the circular polarized electromagnetic radiation. The effect can be understood in terms of the pseudospin selection rules for the interband optical transitions in the presence of exchange electron-electron interactions which alter the pseudospin texture in momentum space. The interactions described within a semi-analytical Hartree--Fock approach lead to the formation of the topologically different broken--symmetry states characterized by Chern numbers and zero-field anomalous Hall conductivities.
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