Solving Quantum Impurity Problems in and out of Equilibrium with the Variational Approach
文献类型：期刊论文
| 作者 | Ashida, Y; Shi, T4 ; Banuls, MC; Cirac, JI; Demler, E2
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| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2018 |
| 卷号 | 121期号:2页码:26805 |
| 关键词 | DILUTE MAGNETIC ALLOYS MANY-BODY SYSTEM KONDO PROBLEM RENORMALIZATION-GROUP FERMION SYSTEMS STATES MODEL LIMIT DOT RESONANCE |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.121.026805 |
| 英文摘要 | A versatile and efficient variational approach is developed to solve in-and out-of-equilibrium problems of generic quantum spin-impurity systems. Employing the discrete symmetry hidden in spin-impurity models, we present a new canonical transformation that completely decouples the impurity and bath degrees of freedom. Combining it with Gaussian states, we present a family of many-body states to efficiently encode nontrivial impurity-bath correlations. We demonstrate its successful application to the anisotropic and two-lead Kondo models by studying their spatiotemporal dynamics and universal behavior in the correlations, relaxation times, and the differential conductance. We compare them to previous analytical and numerical results. In particular, we apply our method to study new types of nonequilibrium phenomena that have not been studied by other methods, such as long-time crossover in the ferromagnetic easy-plane Kondo model. The present approach will be applicable to a variety of unsolved problems in solid-state and ultracold-atomic systems. |
| 学科主题 | Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/22863]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 作者单位 | 1.Harvard Univ, Dept Phys, Cambridge, MA 02138 USA 2.Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China 4.Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan |
| 推荐引用方式 GB/T 7714 | Ashida, Y,Shi, T,Banuls, MC,et al. Solving Quantum Impurity Problems in and out of Equilibrium with the Variational Approach[J]. PHYSICAL REVIEW LETTERS,2018,121(2):26805. |
| APA | Ashida, Y,Shi, T,Banuls, MC,Cirac, JI,&Demler, E.(2018).Solving Quantum Impurity Problems in and out of Equilibrium with the Variational Approach.PHYSICAL REVIEW LETTERS,121(2),26805. |
| MLA | Ashida, Y,et al."Solving Quantum Impurity Problems in and out of Equilibrium with the Variational Approach".PHYSICAL REVIEW LETTERS 121.2(2018):26805. |
入库方式： OAI收割
来源：理论物理研究所
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