银原子开关的非平衡量子输运性质

Nonequilibrium quantum transport properties of a silver atomic switch.

作者信息

Wang Zhongchang, Kadohira Takuya, Tada Tomofumi, Watanabe Satoshi

机构信息

Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

出版信息

Nano Lett. 2007 Sep;7(9):2688-92. doi: 10.1021/nl0711054. Epub 2007 Aug 2.

DOI:10.1021/nl0711054

PMID:17672507

Abstract

Combining nonequilibrium Green's function technique with density functional theory, electron transport, and structural properties of an Ag atomic switch through Ag2S have been investigated. We have found that an Ag atomic conductance channel in Ag2S is generated after structure optimization, resulting in large enhancement of the electron transmission coefficient at the Fermi level and metallic behavior of the Ag-Ag2S-Ag system. Such spontaneous metallization at the Ag-Ag2S interface may play an important role in fast switching of the Ag-Ag2S atomic switch.

摘要

结合非平衡格林函数技术与密度泛函理论，对通过硫化银的银原子开关的电子输运和结构特性进行了研究。我们发现，结构优化后在硫化银中产生了一个银原子传导通道，导致费米能级处的电子传输系数大幅增强，以及银-硫化银-银系统的金属行为。银-硫化银界面处的这种自发金属化可能在银-硫化银原子开关的快速切换中起重要作用。