漂移偏置二维金属的非互易等离激元响应
Nonreciprocal plasmonic response of drift-biased two-dimensional metals
- Istituto Italiano di Tecnologia（意大利理工大学）
- University of Southern Denmark（南丹麦大学）
- Danish Institute for Advanced Study, University of Southern Denmark（南丹麦大学丹麦高等研究院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究针对两类二维电子气建立非局部电动力学框架，发现相同漂移参数下抛物线型2DEG非互易性更强，其为可调谐非互易等离激元学提供了有前景平台。
AI中文摘要：
我们针对具有狄拉克（线性）和抛物线（二次）色散的漂移偏置二维电子气（2DEGs）建立了非局部电动力学框架，从玻尔兹曼输运方程推导得到与漂移相关的闭合形式电导率张量。我们获得了点偶极子的等离激元色散和近场发射，揭示了两种系统中均存在非互易传播。在相同漂移参数下，抛物线型2DEG表现出比狄拉克系统更强的非互易性，但我们发现更大的漂移参数本身并不会产生更强的非互易性：该响应由漂移与等离激元非局域性的相互作用决定。因此，半导体2DEG的强非局域性与实验可实现的漂移速度相结合，使抛物线型系统成为可调谐非互易等离激元学的有前景平台。
英文摘要：
We develop a nonlocal electrodynamic framework for drift-biased two-dimensional electron gases (2DEGs) with Dirac (linear) and parabolic (quadratic) dispersions, deriving closed-form drift-dependent conductivity tensors from the Boltzmann transport equation. We obtain the plasmon dispersion and near-field emission of a point dipole, revealing nonreciprocal propagation in both systems. At equal drift parameter, the parabolic 2DEG exhibits stronger nonreciprocity than the Dirac system, although we find that a larger drift parameter does not by itself produce stronger nonreciprocity: the response is set by the interplay of drift and plasmon nonlocality. As such, the combination of strong nonlocality and experimentally accessible drift velocities of semiconductor 2DEGs identifies parabolic systems as a promising platform for tunable, nonreciprocal plasmonics.
