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arXiv 0903.3272cond-mat.str-el
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Dzyloshinskiii-Moriya螺旋磁体中的Skyrmions和反常霍尔效应

Skyrmions and Anomalous Hall Effect in a Dzyloshinskii-Moriya Spiral Magnet

Su Do Yi, Shigeki Onoda, Naoto Nagaosa, Jung Hoon Han

摘要:

利用蒙特卡罗模拟研究了一个具有Dzylosinskiii-Moriya相互作用的自旋模型,并在磁场作用下研究了自旋各向异性.我们发现了一个丰富的相图包含多个自旋螺旋(或skyrme晶体)相的正方形,矩形和六边形对称,除了螺旋自旋状态。霍尔电导率$σ_{xy}$在每个相的$sd$模型内计算。当$σ_{xy}$在没有外部磁场的情况下为零时,施加大于阈值$H_c$的场强度$H$导致非零手性和霍尔电导率的同时开始。我们发现多个自旋螺旋状态的$H_c = 0$为$H_c = 0$,但无论场方向如何,单自旋螺旋状态的$H_c > 0$为$H_c > 0$。本研究结果MnSi的相关性进行了讨论。

英文摘要:

Monte Carlo simulation study of a classical spin model with Dzylosinskii-Moriya interaction and the spin anisotropy under the magnetic field is presented. We found a rich phase diagram containing the multiple spin spiral (or skyrme crystal) phases of square, rectangular, and hexagonal symmetries in addition to the spiral spin state. The Hall conductivity $σ_{xy}$ is calculated within the $sd$ model for each of the phases. While $σ_{xy}$ is zero in the absence of external magnetic field, applying a field strength $H$ larger than a threshold value $H_c$ leads to the simultaneous onset of nonzero chirality and Hall conductivity. We find $H_c = 0$ for the multiple spin spiral states, but $H_c > 0$ for a single spin spiral state regardless of the field orientation. Relevance of the present results to MnSi is discussed.

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。

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