未掺杂石墨烯中的高次谐波产生：带间和带内动力学的相互作用
High harmonic generation in undoped graphene: Interplay of inter- and intraband dynamics
摘要：
我们发展了一种基于长度规范的密度矩阵方法来计算本征单层石墨烯在太赫兹频率下的非线性响应。采用紧束缚模型，我们发现，带间和带内动力学的相互作用导致强谐波产生在中等场振幅。特别是，我们发现，在低温下，未掺杂的悬浮石墨烯的反射场表现出的三次谐波振幅是32%的基本为100 V/cm的入射场。此外，我们发现，高达第七谐波和超越产生。
英文摘要：
We develop a density matrix formalism in the length gauge to calculate the nonlinear response of intrinsic monolayer graphene at terahertz frequencies. Employing a tight-binding model, we find that the interplay of the interband and intraband dynamics leads to strong harmonic generation at moderate field amplitudes. In particular, we find that at low temperature, the reflected field of undoped suspended graphene exhibits a third harmonic amplitude that is 32% of the fundamental for an incident field of 100 V/cm. Moreover, we find that up to the seventh harmonic and beyond are generated.
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