Abstract

The response of high harmonics of a laser field to the change of Fermi surface topology in graphene-like nanostructures during the process of the high harmonic generation has been investigated. The microscopic nonlinear quantum theory of the interaction of intense coherent electromagnetic radiation with such systems near the critical Fermi level is used. The Liouville–von Neumann equation for the density matrix in the multiphoton excitation regime is solved numerically. The obtained results show that high harmonics are sensitive to the change of the topology of the Fermi surface which can be used for the determination of the Fermi energy in such systems.

中文翻译：

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类石墨烯纳米结构中高谐波产生的费米表面拓扑特征

摘要

已经研究了激光场的高次谐波对高次谐波产生过程中类石墨烯纳米结构中费米表面拓扑变化的响应。使用了强相干电磁辐射与临界费米能级附近的系统相互作用的微观非线性量子理论。多光子激发区密度矩阵的 Liouville-von Neumann 方程得到了数值求解。获得的结果表明，高次谐波对费米面的拓扑变化很敏感，可用于确定此类系统中的费米能量。