arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0704.0764cond-mat.str-el
收藏

外磁场中自旋为1/2的受抑铁磁链的关联函数和激发谱

Correlation functions and excitation spectrum of the frustrated ferromagnetic spin-1/2 chain in an external magnetic field

T. Vekua, A. Honecker, H. -J. Mikeska, F. Heidrich-Meisner

摘要:

利用有效场论方法,结合Lanczos对角化和密度矩阵重整化群方法的数值计算,研究了磁场对一维阻挫铁磁链的影响.的基态的性质示出从自旋密度波区域的向列相接近饱和磁化强度。分析了单自旋反转激发能隙的激发谱,详细研究了单自旋反转激发能隙的行为,包括有限尺寸修正。

英文摘要:

Magnetic field effects on the one-dimensional frustrated ferromagnetic chain are studied by means of effective field theory approaches in combination with numerical calculations utilizing Lanczos diagonalization and the density matrix renormalization group method. The nature of the ground state is shown to change from a spin-density-wave region to a nematic-like one upon approaching the saturation magnetization. The excitation spectrum is analyzed and the behavior of the single spin-flip excitation gap is studied in detail, including the emergent finite-size corrections.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑