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

作　　者：陈浩灿 张艳阳 Chen Haocan;Zhang Yanyang(School of Physics and Materials Science,Guangzhou University,Guangzhou,China)

机构地区：[1]广州大学物理与材料科学学院,广东广州

出　　处：《科学技术创新》2024年第16期54-57,共4页Scientific and Technological Innovation

基　　金：广东省自然科学基金的支持项目编号:2023A1515010698。

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。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 reducing 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 tunneling 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 

分 类 号：O455[理学—无线电物理]