Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice

A. Singha; M. Gibertini; B. Karmakar; S. Yuan; M. Polini; G. Vignale; M. I. Katsnelson; A. Pinczuk; L. N. Pfeiffer; K. W. West; V. Pellegrini

doi:10.1126/science.1204333

Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice

A. Singha, M. Gibertini, B. Karmakar, S. Yuan, M. Polini, G. Vignale, M. I. Katsnelson, A. Pinczuk, L. N. Pfeiffer, K. W. West, V. Pellegrini

Research output: Contribution to journal › Article › peer-review

190 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	1176-1179
Number of pages	4
Journal	Science
Volume	332
Issue number	6034
DOIs	https://doi.org/10.1126/science.1204333
State	Published - Jun 3 2011
Externally published	Yes

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title = "Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice",

abstract = "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.",

author = "A. Singha and M. Gibertini and B. Karmakar and S. Yuan and M. Polini and G. Vignale and Katsnelson, {M. I.} and A. Pinczuk and Pfeiffer, {L. N.} and West, {K. W.} and V. Pellegrini",

year = "2011",

month = jun,

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doi = "10.1126/science.1204333",

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T1 - Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice

AU - Singha, A.

AU - Gibertini, M.

AU - Karmakar, B.

AU - Yuan, S.

AU - Polini, M.

AU - Vignale, G.

AU - Katsnelson, M. I.

AU - Pinczuk, A.

AU - Pfeiffer, L. N.

AU - West, K. W.

AU - Pellegrini, V.

PY - 2011/6/3

Y1 - 2011/6/3

N2 - 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.

AB - 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.

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SP - 1176

EP - 1179

JO - Science

JF - Science

IS - 6034

ER -

Two-dimensional Mott-Hubbard electrons in an artificial honeycomb lattice

Abstract

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