Predominance of Antiferromagnetism in Two-dimensional Underdoped Hubbard Model

H. Yokoyama; R. Sato; K. Kobayashi

doi:10.1016/j.phpro.2016.04.006

Predominance of Antiferromagnetism in Two-dimensional Underdoped Hubbard Model

H. Yokoyama, R. Sato, K. Kobayashi

SCI - Physics

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

Most studies of square-lattice Hubbard models in view of cuprate superconductors hitherto have neglected a band-renormalization effect (BRE) owing to strong electron correlation, especially, for an antiferromagnetic (AF) order. In this study, we introduce BRE into a d-wave superconducting and an AF states independently in the framework of many-body variation theory. It is found that, in sharp contrast to usual understandings, energy of an AF state is sizably reduced by BRE, and the AF area in the ground-state phase diagram is greatly expanded to cover the whole underdoped regime. The AF state with BRE exhibits distinct features according as the value of diagonal hopping ratio t′/t is greater or less than t′/t ∼ - 0.05.

Original language	English
Pages (from-to)	9-12
Number of pages	4
Journal	Physics Procedia
Volume	81
DOIs	https://doi.org/10.1016/j.phpro.2016.04.006
Publication status	Published - 2016 Jan 1
Event	28th International Symposium on Superconductivity, ISS 2015 - Tokyo, Japan Duration: 2015 Nov 16 → 2015 Nov 18

Keywords

Hubbard model
Superconductivity
antiferromagnetism
band renormalization effect
cuprate
phase separation
variation theory

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1016/j.phpro.2016.04.006

Cite this

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title = "Predominance of Antiferromagnetism in Two-dimensional Underdoped Hubbard Model",

abstract = "Most studies of square-lattice Hubbard models in view of cuprate superconductors hitherto have neglected a band-renormalization effect (BRE) owing to strong electron correlation, especially, for an antiferromagnetic (AF) order. In this study, we introduce BRE into a d-wave superconducting and an AF states independently in the framework of many-body variation theory. It is found that, in sharp contrast to usual understandings, energy of an AF state is sizably reduced by BRE, and the AF area in the ground-state phase diagram is greatly expanded to cover the whole underdoped regime. The AF state with BRE exhibits distinct features according as the value of diagonal hopping ratio t′/t is greater or less than t′/t ∼ - 0.05.",

keywords = "Hubbard model, Superconductivity, antiferromagnetism, band renormalization effect, cuprate, phase separation, variation theory",

author = "H. Yokoyama and R. Sato and K. Kobayashi",

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journal = "Physics Procedia",

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note = "28th International Symposium on Superconductivity, ISS 2015 ; Conference date: 16-11-2015 Through 18-11-2015",

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TY - JOUR

T1 - Predominance of Antiferromagnetism in Two-dimensional Underdoped Hubbard Model

AU - Yokoyama, H.

AU - Sato, R.

AU - Kobayashi, K.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Most studies of square-lattice Hubbard models in view of cuprate superconductors hitherto have neglected a band-renormalization effect (BRE) owing to strong electron correlation, especially, for an antiferromagnetic (AF) order. In this study, we introduce BRE into a d-wave superconducting and an AF states independently in the framework of many-body variation theory. It is found that, in sharp contrast to usual understandings, energy of an AF state is sizably reduced by BRE, and the AF area in the ground-state phase diagram is greatly expanded to cover the whole underdoped regime. The AF state with BRE exhibits distinct features according as the value of diagonal hopping ratio t′/t is greater or less than t′/t ∼ - 0.05.

AB - Most studies of square-lattice Hubbard models in view of cuprate superconductors hitherto have neglected a band-renormalization effect (BRE) owing to strong electron correlation, especially, for an antiferromagnetic (AF) order. In this study, we introduce BRE into a d-wave superconducting and an AF states independently in the framework of many-body variation theory. It is found that, in sharp contrast to usual understandings, energy of an AF state is sizably reduced by BRE, and the AF area in the ground-state phase diagram is greatly expanded to cover the whole underdoped regime. The AF state with BRE exhibits distinct features according as the value of diagonal hopping ratio t′/t is greater or less than t′/t ∼ - 0.05.

KW - Hubbard model

KW - Superconductivity

KW - antiferromagnetism

KW - band renormalization effect

KW - cuprate

KW - phase separation

KW - variation theory

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U2 - 10.1016/j.phpro.2016.04.006

DO - 10.1016/j.phpro.2016.04.006

M3 - Conference article

AN - SCOPUS:84994615800

SN - 1875-3892

VL - 81

SP - 9

EP - 12

JO - Physics Procedia

JF - Physics Procedia

T2 - 28th International Symposium on Superconductivity, ISS 2015

Y2 - 16 November 2015 through 18 November 2015

ER -

Predominance of Antiferromagnetism in Two-dimensional Underdoped Hubbard Model

Abstract

Keywords

ASJC Scopus subject areas

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