Orbital Dzyaloshinskii-Moriya exchange interaction

被引：6

作者：

Kim, Panjin ^{[1
,2
]}

Han, Jung Hoon ^{[1
,2
,3
]}

机构：

[1] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea

[2] Sungkyunkwan Univ, Phys Res Div BK21, Suwon 440746, South Korea

[3] POSTECH, Asia Pacific Ctr Theoret Phys, Pohang 790784, Gyeongbuk, South Korea

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 20期

关键词：

ANISOTROPIC SUPEREXCHANGE INTERACTION; WEAK FERROMAGNETISM; SPIN; ANTIFERROMAGNETISM; DEGENERACY; SYSTEMS; METALS; STATES;

D O I：

10.1103/PhysRevB.87.205119

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A superexchange calculation is performed for multiorbital band models with broken inversion symmetry. Orbital-changing hopping terms allowed by the symmetry-breaking electric field lead to a new kind of orbital exchange interaction closely resembling the Dzyaloshinskii-Moriya spin exchange. Inversion symmetry breaking as present in surfaces and interfaces and a strong on-site repulsion, but not the spin-orbit interaction, are the requirements to observe the proposed effect. The mean-field phase diagram exhibits a rich structure including anti-ferro-orbital, ferro-orbital, and both single and multiple spiral-orbital phases, in close analogy with the Skyrmion spin crystal phase recently discovered in thin-film chiral magnets.

引用

页数：5

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