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Spin-flip excitations in bilayer quantum Hall ferromagnets

机译:双层量子霍尔铁磁体中的自旋翻转激发

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Bilayer quantum Hall systems at v = 1 are believed to have a ground state with spontaneous spin-polarization and spontaneous interlayer phase coherence. In this paper, we address the spectrum of spin-flip collective excitations using a generalized lattice spin model that appeals to the quantum Hall gap to justify neglect of charge fluctuations. We find that the long wavelength spin-flip excitation spectrum consists of the global Larmor spin-wave mode and a higher energy mode in which spin-waves in the two-layers are out of phase. We address the dependence of the energy splitting of the two modes on quantum fluctuations in the bilayer ground state. (C) 2005 Published by Elsevier Ltd.
机译:在v = 1的双层量子霍尔系统被认为具有自发自旋极化和自发层间相干的基态。在本文中,我们使用广义晶格自旋模型解决自旋翻转集体激发的光谱,该模型吸引量子霍尔间隙以证明忽略电荷波动是合理的。我们发现,长波长自旋翻转激发光谱由全局拉莫尔自旋波模式和高能模式组成,其中两层中的自旋波异相。我们研究了两种模式的能量分裂对双层基态量子涨落的依赖性。 (C)2005由Elsevier Ltd.出版

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