流体动力学 regime 下具有直流电流的石墨烯中的太赫兹横向电模式。（注：这里“regime”没有特别合适的中文词汇准确对应，可根据上下文灵活理解，比如“状态”“ regime”等，这里保留英文供你参考。）

Terahertz transverse electric modes in graphene with DC current in hydrodynamic regime.

作者信息

Moiseenko I M, Popov V V, Fateev D V

机构信息

Kotelnikov Institute of Radio Engineering and Electronics (Saratov Branch), Russian Academy of Sciences, Saratov 410019, Russia.

Saratov State University, Saratov 410012, Russia.

出版信息

J Phys Condens Matter. 2022 May 18;34(29). doi: 10.1088/1361-648X/ac6cbd.

DOI:10.1088/1361-648X/ac6cbd

PMID:35508149

Abstract

The dispersion, excitation, and amplification of electromagnetic transverse electric (TE) modes at terahertz (THz) frequencies in graphene in the hydrodynamic (HD) regime, with a direct electric current flowing perpendicular to the TE mode wavevector, were theoretically investigated. The expression for the nonlocal HD conductivity of graphene with a direct electric current flowing perpendicular to the TE mode wavevector was derived. The direct electric current in graphene leads to the capacitive nature of the graphene HD conductivity at THz frequencies, which makes TE modes exist in this frequency range. The excitation of TE modes in graphene by an incident THz wave was modeled for the attenuated total reflection geometry. A new physical mechanism of TE mode amplification in graphene effective for a low value of carrier drift velocity was predicted. THz lasing regimes with TE modes in graphene structure with direct electric current were found. The results of this work can be used to create miniature technologically feasible sources and amplifiers of THz radiation.

摘要

理论研究了在流体动力学（HD） regime下，当直流电流垂直于太赫兹（THz）频率的电磁横向电（TE）模式波矢流动时，石墨烯中TE模式的色散、激发和放大情况。推导了直流电流垂直于TE模式波矢流动时石墨烯的非局部HD电导率表达式。石墨烯中的直流电流导致了太赫兹频率下石墨烯HD电导率的电容性质，这使得TE模式能够在该频率范围内存在。针对衰减全反射几何结构，对入射太赫兹波激发石墨烯中的TE模式进行了建模。预测了一种在低载流子漂移速度下对石墨烯中TE模式放大有效的新物理机制。发现了具有直流电流的石墨烯结构中TE模式的太赫兹激光 regime。这项工作的结果可用于制造技术上可行的太赫兹辐射微型源和放大器。