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DOI | 10.1038/nature23680 |
Imaging magnetic polarons in the doped Fermi-Hubbard model | |
Koepsell, Joannis1; Vijayan, Jayadev1; Sompet, Pimonpan1; Grusdt, Fabian2,3; Hilker, Timon A.1,5; Demler, Eugene2; Salomon, Guillaume1; Bloch, Immanuel1,4; Gross, Christian1 | |
2019-08-15 | |
发表期刊 | NATURE |
ISSN | 0028-0836 |
EISSN | 1476-4687 |
出版年 | 2019 |
卷号 | 572期号:7769页码:358-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA; England |
英文摘要 | Polarons-electronic charge carriers 'dressed' by a local polarization of the background environment-are among the most fundamental quasiparticles in interacting many-body systems, and emerge even at the level of a single dopant(1). In the context of the two-dimensional Fermi-Hubbard model, polarons are predicted to form around charged dopants in an antiferromagnetic background in the low-doping regime, close to the Mott insulating state(2-7); this prediction is supported by macroscopic transport and spectroscopy measurements in materials related to high-temperature superconductivity(8). Nonetheless, a direct experimental observation of the internal structure of magnetic polarons is lacking. Here we report the microscopic real-space characterization of magnetic polarons in a doped Fermi-Hubbard system, enabled by the single-site spin and density resolution of our ultracold-atom quantum simulator. We reveal the dressing of doublons by a local reduction-and even sign reversal-of magnetic correlations, which originates from the competition between kinetic and magnetic energy in the system. The experimentally observed polaron signatures are found to be consistent with an effective string model at finite temperature(7). We demonstrate that delocalization of the doublon is a necessary condition for polaron formation, by comparing this setting with a scenario in which a doublon is pinned to a lattice site. Our work could facilitate the study of interactions between polarons, which may lead to collective behaviour, such as stripe formation, as well as the microscopic exploration of the fate of polarons in the pseudogap and 'bad metal' phases. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000481414100041 |
WOS关键词 | ULTRACOLD ATOMS ; ONE-HOLE ; SPIN ; MOTION ; STATE |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/202793 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Max Planck Inst Quantum Opt, Garching, Germany; 2.Harvard Univ, Dept Phys, Cambridge, MA 02138 USA; 3.Tech Univ Munich, Dept Phys, Garching, Germany; 4.Ludwig Maximilians Univ Munchen, Fak Phys, Munich, Germany; 5.Univ Cambridge, Cavendish Lab, Cambridge, England |
推荐引用方式 GB/T 7714 | Koepsell, Joannis,Vijayan, Jayadev,Sompet, Pimonpan,et al. Imaging magnetic polarons in the doped Fermi-Hubbard model[J]. NATURE,2019,572(7769):358-+. |
APA | Koepsell, Joannis.,Vijayan, Jayadev.,Sompet, Pimonpan.,Grusdt, Fabian.,Hilker, Timon A..,...&Gross, Christian.(2019).Imaging magnetic polarons in the doped Fermi-Hubbard model.NATURE,572(7769),358-+. |
MLA | Koepsell, Joannis,et al."Imaging magnetic polarons in the doped Fermi-Hubbard model".NATURE 572.7769(2019):358-+. |
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