Orthorhombic-to-monoclinic phase transition of Ta2NiSe5 induced by the Bose-Einstein condensation of excitons

被引：164

作者：

Kaneko, T. ^{[1
]}

Toriyama, T. ^{[1
]}

Konishi, T. ^{[2
]}

Ohta, Y. ^{[1
]}

机构：

[1] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[2] Chiba Univ, Grad Sch Adv Integrat Sci, Chiba 2638522, Japan

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 03期

关键词：

TMSE0.45TE0.55; FERROMAGNETISM; INSULATOR;

D O I：

10.1103/PhysRevB.87.035121

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using the band structure calculation and mean-field analysis of the derived three-chain Hubbard model with phonon degrees of freedom, we discuss the origin of the orthorhombic-to-monoclinic phase transition of the layered chalcogenide Ta2NiSe5. We show that the Bose-Einstein condensation of excitonic electron-hole pairs cooperatively induces the instability of the phonon mode at momentum q -> 0 in the quasi-one-dimensional Ta-NiSe-Ta chain, resulting in the structural phase transition of the system. The calculated single-particle spectra reproduce the deformation of the band structure observed in the angle-resolved photoemission spectroscopy experiment. DOI: 10.1103/PhysRevB.87.035121

引用

页数：5

共 34 条

[31] High-temperature weak ferromagnetism in a low-density free-electron gas [J].