Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice

Akihisa Koga; Takuya Yoshioka; Norio Kawakami; Hisatoshi Yokoyama

doi:10.1016/j.jmmm.2006.10.1075

Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice

Akihisa Koga, Takuya Yoshioka, Norio Kawakami, Hisatoshi Yokoyama

SCI - Physics

Osaka University

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

1 Citation (Scopus)

Abstract

We investigate electron correlations in the two-dimensional Hubbard model on the planar pyrochlore lattice. By means of variational Monte Carlo simulations, we discuss how stable the paramagnetic semi-metallic state is at half-filling. It is found that the increase of the Coulomb interaction induces the first-order transition around U / t ∼ 9, where the magnetically ordered state is more stable than the Mott insulating phase without symmetry breaking.

Original language	English
Pages (from-to)	867-869
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.1075
Publication status	Published - 2007 Mar

Keywords

Hubbard model
Planar pyrochlore
Variational Monte Carlo simulation

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10.1016/j.jmmm.2006.10.1075

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title = "Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice",

abstract = "We investigate electron correlations in the two-dimensional Hubbard model on the planar pyrochlore lattice. By means of variational Monte Carlo simulations, we discuss how stable the paramagnetic semi-metallic state is at half-filling. It is found that the increase of the Coulomb interaction induces the first-order transition around U / t ∼ 9, where the magnetically ordered state is more stable than the Mott insulating phase without symmetry breaking.",

keywords = "Hubbard model, Planar pyrochlore, Variational Monte Carlo simulation",

author = "Akihisa Koga and Takuya Yoshioka and Norio Kawakami and Hisatoshi Yokoyama",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research [17740226 (AK) and 18043017 (NK)] from MEXT. A part of computations was done at the Supercomputer Center at the Institute for Solid State Physics, University of Tokyo and Yukawa Institute Computer Facility.",

year = "2007",

month = mar,

doi = "10.1016/j.jmmm.2006.10.1075",

language = "English",

volume = "310",

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journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

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TY - JOUR

T1 - Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice

AU - Koga, Akihisa

AU - Yoshioka, Takuya

AU - Kawakami, Norio

AU - Yokoyama, Hisatoshi

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research [17740226 (AK) and 18043017 (NK)] from MEXT. A part of computations was done at the Supercomputer Center at the Institute for Solid State Physics, University of Tokyo and Yukawa Institute Computer Facility.

PY - 2007/3

Y1 - 2007/3

N2 - We investigate electron correlations in the two-dimensional Hubbard model on the planar pyrochlore lattice. By means of variational Monte Carlo simulations, we discuss how stable the paramagnetic semi-metallic state is at half-filling. It is found that the increase of the Coulomb interaction induces the first-order transition around U / t ∼ 9, where the magnetically ordered state is more stable than the Mott insulating phase without symmetry breaking.

AB - We investigate electron correlations in the two-dimensional Hubbard model on the planar pyrochlore lattice. By means of variational Monte Carlo simulations, we discuss how stable the paramagnetic semi-metallic state is at half-filling. It is found that the increase of the Coulomb interaction induces the first-order transition around U / t ∼ 9, where the magnetically ordered state is more stable than the Mott insulating phase without symmetry breaking.

KW - Hubbard model

KW - Planar pyrochlore

KW - Variational Monte Carlo simulation

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DO - 10.1016/j.jmmm.2006.10.1075

M3 - Article

AN - SCOPUS:33847247028

SN - 0304-8853

VL - 310

SP - 867

EP - 869

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2 SUPPL. PART 1

ER -

Quantum phase transitions in the Hubbard model on the planar pyrochlore lattice

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