Anomalous-filling-factor-dependent nuclear-spin polarization in a 2D electron system.
Anomalous-filling-factor-dependent nuclear-spin polarization in a 2D electron system.
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DOI：
10.1103/physrevlett.92.086802
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发表时间：
2004-02
影响因子：
8.6
通讯作者：
J. Smet;R. Deutschmann;F. Ertl;W. Wegschei der;G. Abstreiter;K. von Klitzing
中科院分区：
文献类型：
--
作者：
J. Smet;R. Deutschmann;F. Ertl;W. Wegschei der;G. Abstreiter;K. von Klitzing
分数量子霍尔区中与自旋相关的电子相变伴随着很大的电阻变化。结合它们对与2D电子驻留在同一平面上的原子核的自旋取向的敏感性，它们提供了一个方便的电子探针来进行核磁测量。尽管条件应该允许电子和核自旋子系统都接近热力学平衡，但我们发现原子核与预期的热核自旋极化存在显著的和强烈的电子填充因子相关的偏差。
Spin-related electronic phase transitions in the fractional quantum Hall regime are accompanied by a large change in resistance. Combined with their sensitivity to spin orientation of nuclei residing in the same plane as the 2D electrons, they offer a convenient electrical probe to carry out nuclear magnetometry. Despite conditions which should allow both electronic and nuclear-spin subsystems to approach thermodynamic equilibrium, we uncover for the nuclei a remarkable and strongly electronic filling-factor-dependent deviation from the anticipated thermal nuclear-spin polarization.