Two-Dimensional Mott-Hubbard Electrons in an Artificial Honeycomb Lattice

被引：180

作者：

Singha, A. ^{[1
,2
]}

Gibertini, M. ^{[1
,2
]}

Karmakar, B. ^{[1
,2
]}

Yuan, S. ^{[3
]}

Polini, M. ^{[1
,2
,4
]}

Vignale, G. ^{[4
,5
]}

Katsnelson, M. I. ^{[3
]}

Pinczuk, A. ^{[6
,7
]}

Pfeiffer, L. N. ^{[8
]}

West, K. W. ^{[8
]}

Pellegrini, V. ^{[1
,2
]}

机构：

[1] CNR, Ist Nanosci, I-56126 Pisa, Italy

[2] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[3] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands

[4] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China

[5] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA

[6] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY USA

[7] Columbia Univ, Dept Phys, New York, NY USA

[8] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

来源：

SCIENCE | 2011年 / 332卷 / 6034期

基金：

美国国家科学基金会;

关键词：

MEAN-FIELD THEORY; DIRAC FERMIONS; GAS; GRAPHENE; PHYSICS;

D O I：

10.1126/science.1204333

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：

Artificial crystal lattices can be used to tune repulsive Coulomb interactions between electrons. We trapped electrons, confined as a two-dimensional gas in a gallium arsenide quantum well, in a nanofabricated lattice with honeycomb geometry. We probed the excitation spectrum in a magnetic field, identifying collective modes that emerged from the Coulomb interaction in the artificial lattice, as predicted by the Mott-Hubbard model. These observations allow us to determine the Hubbard gap and suggest the existence of a Coulomb-driven ground state.

引用

页码：1176 / 1179

页数：4

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