Observation of spatial charge and spin correlations in the 2D Fermi-Hubbard model

被引：287

作者：

Cheuk, Lawrence W. ^{[1
,2
]}

Nichols, Matthew A. ^{[1
,2
]}

Lawrence, Katherine R. ^{[1
,2
]}

Okan, Melih ^{[1
,2
]}

Zhang, Hao ^{[1
,2
]}

Khatami, Ehsan ^{[3
]}

Trivedi, Nandini ^{[4
]}

Paiva, Thereza ^{[5
]}

Rigol, Marcos ^{[6
]}

Zwierlein, Martin W. ^{[1
,2
]}

机构：

[1] MIT, Dept Phys, MIT Harvard Ctr Ultracold Atoms, Cambridge, MA 02139 USA

[2] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[3] San Jose State Univ, Dept Phys & Astron, San Jose, CA 95192 USA

[4] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA

[5] Univ Fed Rio de Janeiro, Inst Fis, Caixa Postal 68-528, BR-21941972 Rio De Janeiro, RJ, Brazil

[6] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

来源：

SCIENCE | 2016年 / 353卷 / 6305期

基金：

美国国家科学基金会;

关键词：

OPTICAL LATTICE; MOTT INSULATOR; ANTIFERROMAGNETIC CORRELATIONS; GAS; PHYSICS; ATOMS; SUPERCONDUCTIVITY;

D O I：

10.1126/science.aag3349

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Strong electron correlations lie at the origin of high-temperature superconductivity. Its essence is believed to be captured by the Fermi-Hubbard model of repulsively interacting fermions on a lattice. Here we report on the site-resolved observation of charge and spin correlations in the two-dimensional (2D) Fermi-Hubbard model realized with ultracold atoms. Antiferromagnetic spin correlations are maximal at half-filling and weaken monotonically upon doping. At large doping, nearest-neighbor correlations between singly charged sites are negative, revealing the formation of a correlation hole, the suppressed probability of finding two fermions near each other. As the doping is reduced, the correlations become positive, signaling strong bunching of doublons and holes, in agreement with numerical calculations. The dynamics of the doublon-hole correlations should play an important role for transport in the Fermi-Hubbard model.

引用

页码：1260 / 1264

页数：5

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