arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.6017cond-mat.str-el
收藏

S=1反铁磁链的电子自旋共振位移

Electron spin resonance shifts in S=1 antiferromagnetic chains

Shunsuke C. Furuya, Yoshitaka Maeda, Masaki Oshikawa

摘要:

基于几种有效场论理论、Half相的O(3)非线性西格玛模型(NLSM)和上下临界场附近的自由费米子理论,讨论了具有弱单离子各向异性的自旋1海森堡反铁磁链的电子自旋共振(ESR)位移.在O(3)NLSM中,单离子各向异性对应于在同一时间和位置产生两个磁振子的复合算符。因此,即使在自由磁振子近似有效的参数范围内,我们也必须考虑磁振子之间的相互作用。虽然O(3)NLSM仅在Haldom相有效,但将O(3)NLSM的Faddeev-Zamolodchikov算符适当地转换为费米子算符,可以用与Haldom相类似的方式处理低临界场附近的ESR位移。我们提出,我们的理论给出了定量协议与最近的ESR实验结果自旋1链化合物NDMAP。

英文摘要:

We discuss electron spin resonance (ESR) shifts in spin-1 Heisenberg antiferromagnetic chains with a weak single-ion anisotropy based on several effective field theories, the O(3) nonlinear sigma model (NLSM) in the Haldane phase, free fermion theories around the lower and the upper critical fields. In the O(3) NLSM, the single-ion anisotropy corresponds to a composite operator which creates two magnons at the same time and position. Therefore, even inside a parameter range where free magnon approximation is valid, we have to take interactions among magnons into account. Though the O(3) NLSM is only valid in the Haldane phase, an appropriate translation of Faddeev-Zamolodchikov operators of the O(3) NLSM to fermion operators enables one to treat ESR shifts near the lower critical field in a similar manner to discussions in Haldane phase. We present that our theory gives quantitative agreements with recent ESR experimental results on an spin-1 chain compounds NDMAP.

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。

↑