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

192 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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10.1126/science.1204333

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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",

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doi = "10.1126/science.1204333",

language = "English (US)",

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TY - JOUR

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.

UR - https://www.scopus.com/pages/publications/79957932832

UR - https://www.scopus.com/pages/publications/79957932832#tab=citedBy

U2 - 10.1126/science.1204333

DO - 10.1126/science.1204333

M3 - Article

C2 - 21636768

AN - SCOPUS:79957932832

SN - 0036-8075

VL - 332

SP - 1176

EP - 1179

JO - Science

JF - Science

IS - 6034

ER -

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

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