Quantum Breathers in a Two-Dimensional Hexangular Heisenberg Ferromagnet

被引：6

作者：

Feng, Wenhui ^{[1
]}

Wu, Lanjun ^{[1
]}

Tang, Bing ^{[1
,2
]}

Deng, Ke ^{[1
]}

机构：

[1] Jishou Univ, Dept Phys, Jishou 416000, Peoples R China

[2] Jishou Univ, Collaborat Innovat Ctr Manganese Zinc Vanadium In, Jishou 416000, Peoples R China

来源：

INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS | 2021年 / 60卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Discrete breathers; Quantum signature; Two-dimensional hexangular ferromagnets; Single-ion uniaxial anisotropy; INTRINSIC LOCALIZED MODES; 2-MAGNON BOUND-STATES; DISCRETE BREATHERS; MODULATIONAL INSTABILITY; SPIN CHAIN; EXISTENCE; SOLITONS; NEAREST; EXCITATIONS; MAGNONS;

D O I：

10.1007/s10773-021-04769-1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a theoretical study on quantum breathers in a XXZ Heisenberg ferromagnet with the single-ion uniaxial anisotropy on a two-dimensional hexangular lattice. In our work, the full quantum and the semiclassical cases are considered, respectively. For the full quantum case, we find that some isolated two-magnon bands can exist below the free magnon band. Physically, each isolated two-magnon band correspond to a two-magnon bound state, which is the simplest quantum breather state. For the semiclassical case, the analytical form of the discrete breather solution with a line localized structure is obtained by adopting the Glauber's coherent-state representation. Furthermore, the influence of the anisotropy on the properties of quantum breathers is discussed in detail.

引用

页码：1438 / 1454

页数：17

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