Spin Chain in Magnetic Field: Limitations of the Large-N Mean-Field Theory

被引：0

作者：

Wohlfeld, K. ^{[1
,2
,3
]}

Chen, Cheng-Chien ^{[4
]}

van Veenendaal, M. ^{[4
,5
]}

Devereaux, T. P. ^{[1
,2
]}

机构：

[1] SLAC Natl Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[2] Stanford Univ, Menlo Pk, CA 94025 USA

[3] Univ Warsaw, Fac Phys, Inst Theoret Phys, PL-02093 Warsaw, Poland

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[5] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

来源：

ACTA PHYSICA POLONICA A | 2015年 / 127卷 / 02期

关键词：

HUBBARD-MODEL; STATE;

D O I：

10.12693/APhysPolA.127.201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Motivated by the recent success in describing the spin and orbital spectrum of a spin-orbital chain using a large-N mean-field approximation, we apply the same formalism to the case of a spin chain in the external magnetic field. It occurs that in this case, which corresponds to N = 2 in the approximation, the large-N mean-field theory cannot qualitatively reproduce the spin excitation spectra at high magnetic fields, which polarize more than 50% of the spins in the magnetic ground state. This, rather counterintuitively, shows that the physics of a spin chain can under some circumstances be regarded as more complex than the physics of a spin-orbital chain.

引用

页码：201 / 203

页数：3

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