Sánchez Vicenta, Wang Chumin
Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico.
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico.
Nanomaterials (Basel). 2024 Dec 29;15(1):38. doi: 10.3390/nano15010038.
The electronic states in flat bands possess zero group velocity and null charge mobility. Recently, flat electronic bands with fully localized states have been predicted in nanowires, when their hopping integrals between first, second, and third neighbors satisfy determined relationships. Experimentally, these relationships can only be closely achieved under external pressures. In this article, we study the alternating current (AC) in such nanowires having nearly flat electronic bands by means of a new independent channel method developed for the Kubo-Greenwood formula including hopping integrals up to third neighbors. The results reveal a large AC conductivity sensitive to the boundary conditions of measurement, where the charge carriers resonate with the external electric field by oscillating around their localized positions.
平带中的电子态具有零群速度和零电荷迁移率。最近，当纳米线中第一、第二和第三近邻之间的跳跃积分满足特定关系时，已预测出具有完全局域态的平电子带。在实验中，只有在外部压力下才能近似实现这些关系。在本文中，我们通过一种为库博-格林伍德公式开发的新的独立通道方法，研究了具有近平电子带的此类纳米线中的交流电（AC），该方法包括高达第三近邻的跳跃积分。结果表明，交流电导率对测量的边界条件敏感，其中电荷载流子通过在其局域位置附近振荡与外部电场发生共振。
