Efficient variational approach to dynamics of a spatially extended bosonic Kondo model
文献类型：期刊论文
| 作者 | Ashida, Yuto1; Shi, Tao2 ; Schmidt, Richard; Sadeghpour, H. R.; Cirac, J. Ignacio; Demler, Eugene6
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| 刊名 | PHYSICAL REVIEW A
 |
| 出版日期 | 2019 |
| 卷号 | 100期号:4页码:43618 |
| 关键词 | QUANTUM ELECTRONS POLAR |
| ISSN号 | 2469-9926 |
| DOI | 10.1103/PhysRevA.100.043618 |
| 英文摘要 | We develop an efficient variational approach to studying dynamics of a localized quantum spin coupled to a bath of mobile spinful bosons. We use parity symmetry to decouple the impurity spin from the environment via a canonical transformation and reduce the problem to a model of the interacting bosonic bath. We describe coherent time evolution of the latter using bosonic Gaussian states as a variational ansatz. We provide full analytical expressions for equations describing variational time evolution that can be applied to study in- and out-of-equilibrium phenomena in a wide class of quantum impurity problems. In the accompanying paper [Ashida et al., Phys. Rev. Lett. 123, 183001 (2019)], we present a concrete application of this general formalism to the analysis of the Rydberg central spin model, in which the spin-1/2 Rydberg impurity undergoes spin-changing collisions in a dense cloud of two-component ultracold bosons. To illustrate new features arising from orbital motion of the bath atoms, we compare our results to the Monte Carlo study of the model with spatially localized bosons in the bath, in which random positions of the atoms give rise to random couplings of the standard central spin model. |
| 学科主题 | Optics ; Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/26968]  |
| 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.Univ Tokyo, Dept Appl Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan 2.Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan 3.Chinese Acad Sci, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 4.Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany 5.Munich Ctr Quantum Sci & Technol MCQST, Schellingstr 4, D-80799 Munich, Germany 6.Sadeghpour, H. R.] Harvard Smithsonian Ctr Astrophys, ITAMP, 60 Garden St, Cambridge, MA 02138 USA 7.Harvard Univ, Dept Phys, Cambridge, MA 02138 USA |
| 推荐引用方式 GB/T 7714 | Ashida, Yuto,Shi, Tao,Schmidt, Richard,et al. Efficient variational approach to dynamics of a spatially extended bosonic Kondo model[J]. PHYSICAL REVIEW A,2019,100(4):43618. |
| APA | Ashida, Yuto,Shi, Tao,Schmidt, Richard,Sadeghpour, H. R.,Cirac, J. Ignacio,&Demler, Eugene.(2019).Efficient variational approach to dynamics of a spatially extended bosonic Kondo model.PHYSICAL REVIEW A,100(4),43618. |
| MLA | Ashida, Yuto,et al."Efficient variational approach to dynamics of a spatially extended bosonic Kondo model".PHYSICAL REVIEW A 100.4(2019):43618. |
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来源：理论物理研究所
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