广义Kadanoff-Baym Ansatz修正的短时特征

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2025-05-07 DOI:10.1140/epjb/s10051-025-00938-x

A. Kalvová, P. Lipavský

{"title":"广义Kadanoff-Baym Ansatz修正的短时特征","authors":"A. Kalvová, P. Lipavský","doi":"10.1140/epjb/s10051-025-00938-x","DOIUrl":null,"url":null,"abstract":"<p>An approximation of the Green function based on the Generalized Kadanoff–Baym Ansatz and its correction is tested on the electron tunneling through a single atom, incorporating the on-site second-order Born interaction. Time evolution resulting from the corresponding kinetic equation for the density matrix is compared with the direct solution of the non-equilibrium Green functions. It is demonstrated that the short-time nature of corrections beyond the Generalized Kadanoff–Baym Ansatz enables their effective numerical approximation.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 5","pages":""},"PeriodicalIF":1.6000,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00938-x.pdf","citationCount":"0","resultStr":"{\"title\":\"Short-time character of corrections to the generalized Kadanoff–Baym Ansatz\",\"authors\":\"A. Kalvová, P. Lipavský\",\"doi\":\"10.1140/epjb/s10051-025-00938-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>An approximation of the Green function based on the Generalized Kadanoff–Baym Ansatz and its correction is tested on the electron tunneling through a single atom, incorporating the on-site second-order Born interaction. Time evolution resulting from the corresponding kinetic equation for the density matrix is compared with the direct solution of the non-equilibrium Green functions. It is demonstrated that the short-time nature of corrections beyond the Generalized Kadanoff–Baym Ansatz enables their effective numerical approximation.</p>\",\"PeriodicalId\":787,\"journal\":{\"name\":\"The European Physical Journal B\",\"volume\":\"98 5\",\"pages\":\"\"},\"PeriodicalIF\":1.6000,\"publicationDate\":\"2025-05-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00938-x.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The European Physical Journal B\",\"FirstCategoryId\":\"4\",\"ListUrlMain\":\"https://link.springer.com/article/10.1140/epjb/s10051-025-00938-x\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"PHYSICS, CONDENSED MATTER\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The European Physical Journal B","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1140/epjb/s10051-025-00938-x","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}

引用次数: 0

摘要

基于广义Kadanoff-Baym Ansatz的格林函数近似及其修正在电子穿隧通过单个原子时进行了测试，并考虑了现场二阶玻恩相互作用。由密度矩阵相应的动力学方程得到的时间演化与非平衡格林函数的直接解进行了比较。证明了超越广义Kadanoff-Baym Ansatz的修正的短时间性质使它们能够有效地进行数值逼近。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Short-time character of corrections to the generalized Kadanoff–Baym Ansatz

An approximation of the Green function based on the Generalized Kadanoff–Baym Ansatz and its correction is tested on the electron tunneling through a single atom, incorporating the on-site second-order Born interaction. Time evolution resulting from the corresponding kinetic equation for the density matrix is compared with the direct solution of the non-equilibrium Green functions. It is demonstrated that the short-time nature of corrections beyond the Generalized Kadanoff–Baym Ansatz enables their effective numerical approximation.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊