Gap opening mechanism for correlated Dirac electrons in organic compounds α-(BEDT-TTF)2I3 and α-(BEDT-TSeF)2I3

被引：5

作者：

Ohki, Daigo ^{[1
]}

Yoshimi, Kazuyoshi ^{[2
]}

Kobayashi, Akito ^{[1
]}

Misawa, Takahiro ^{[3
]}

机构：

[1] Nagoya Univ, Dept Phys, Furo Cho,Chikusa Ku, Nagoya 4648602, Japan

[2] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[3] Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China

来源：

PHYSICAL REVIEW B | 2023年 / 107卷 / 04期

基金：

中国国家自然科学基金;

关键词：

SPIN; CONDUCTOR; TRANSPORT; FERMIONS; ABSENCE; MODEL;

D O I：

10.1103/PhysRevB.107.L041108

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To determine how electron correlations open a gap in two-dimensional massless Dirac electrons in the organic compounds alpha-(BEDT-TTF)2I3 [alpha-(ET)2I3] and alpha-(BEDT-TSeF)2I3 [alpha-(BETS)2I3], we derive and analyze ab initio low-energy effective Hamiltonians for these two compounds. We find that the horizontal stripe charge ordering opens a gap in the massless Dirac electrons in alpha-(ET)2I3, while an insulating phase without explicit symmetry breaking appears in alpha-(BETS)2I3. We clarify that a combination of anisotropic transfer integrals and electron correlations induces a dimensional reduction in the spin correlations, i.e., one-dimensional spin correlations develop in alpha-(BETS)2I3. We show that one-dimensional spin correlations open a gap in the massless Dirac electrons. Our finding paves the way for opening gaps for massless Dirac electrons using strong electron correlations.

引用

页数：6

共 50 条

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