一维非对称能带模型及其输运特性
A One-Dimensional Long Range Model with a Highly Asymmetric Band Structure and Its Transport Properties
陈浩灿 1张艳阳1
作者信息
- 1. 广州大学 物理与材料科学学院,广东 广州
- 折叠
摘要
基于长程跳迁的紧束缚模型,我们设计了一种高度非对称的能带结构,并研究了该系统的量子输运特性.我们发现,在当电极与中心区材料完全一致时,在输运上出现了多通道的现象.而且随着跳迁范围的增大,通道数的最大值也随之增大.引入有限温度耗散后,输运出现了明显的方向性.而当电极与中心区材料不一致时,则出现了共振隧穿.这些现象为我们研究一维长程系统,尤其是具有方向性传播的器件提供了新的可能性.
Abstract
Based on the tight-binding model of long range hopping,we design a one-dimensional lattice model with a highly asymmetric band structure and investigate its transport properties.We found that when the lead is completely consistent with the sample in the central sample,there is a phenomenon of multi-channel transport.As the hopping range increases,the maximum number of channels also increases.After re ducing the quantum lifetime through dephasing dissipation,there is a significant difference between forward and backward transports.When the lead and the central sample material are not consistent,resonant tunnel ing effect occurs.These phenomena provide us with new possibilities for studying one-dimensional devices with directional transports.
关键词
长程模型/量子输运/方向性输运Key words
long range model/group velocity/transport channel引用本文复制引用
基金项目
广东省自然科学基金(2023A1515010698)
出版年
2024
NETL
NSTL
万方数据