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arXiv 1010.1885cond-mat.str-el
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倾斜磁场中$ν=2/3$量子霍尔态磁电阻滞回的各向异性

Anisotropy of Magnetoresistance Hysteresis around the $ν=2/3$ Quantum Hall State in Tilted Magnetic Field

K. Iwata, M. Morino, A. Fukuda, N. Kumada, Z. F. Ezawa, Y. Hirayama, A. Sawada

摘要:

我们提出了在倾斜磁场中,在朗道能级填充因子$ν=2/3$处自旋跃迁点附近的滞后输运的各向异性。当磁场$B_{\parallel}$的面内分量的方向垂直于探测电流$I$时,由于电流诱导的核自旋极化而发生强滞后输运。另一方面,当$B_{\parallel}$平行于$I$时,滞后几乎消失。我们还证明了在转变点处的核自旋-晶格弛豫速率$T_{1}^{-1}$随着$B_{\parallel}$和$I$方向之间的角度的减小而增加。这些结果表明,$ν=2/3$周围的电子自旋畴的形态受到电流方向的影响。

英文摘要:

We present an anisotropy of the hysteretic transport around the spin transition point at Landau level filling factor $ν=2/3$ in tilted magnetic field. When the direction of the in-plane component of the magnetic field $B_{\parallel}$ is normal to the probe current $I$, a strong hysteretic transport due to the current-induced nuclear spin polarization occurs. When $B_{\parallel}$ is parallel to $I$, on the other hand, the hysteresis almost disappears. We also demonstrate that the nuclear spin-lattice relaxation rate $T_{1}^{-1}$ at the transition point increases with decreasing angle between the directions of $B_{\parallel}$ and $I$. These results suggest that the morphology of electron spin domains around $ν=2/3$ is affected by the current direction.

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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