标题:Disorder-enhanced nuclear spin relaxation at Landau level filling factor one
作者:关童[1];Benedikt Friess[2];李永庆[1];颜世申[3];Vladimir Umansky[4];Klaus von Klitzing[2];Jurgen H. Smet[2]
作者机构:[关童;李永庆]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.;[Bene 更多
来源:中国物理B:英文版
出版年:2015
期:06
关键词:核自旋弛豫;朗道能级;填充因子;松驰;温度依赖性;阿伦尼乌斯;电子系统;电子密度;
摘要:The nuclear spin relaxation rate(1/T1) is measured for Ga As two-dimensional(2D) electron systems in the quantum Hall regime with an all-electrical technique for agitating and probing the nuclear spins.A \"tilted plateau\" feature is observed near the Landau level filling factor ν = 1 in 1/T1 versus ν.Both the width and magnitude of the plateau increase with decreasing electron density.At low temperatures,1/T1 exhibits an Arrhenius temperature dependence within the tilted plateau regime.The extracted energy gaps are up to two orders of magnitude smaller than the corresponding charge transport gaps.These results point to a nontrivial mechanism for the disorder-enhanced nuclear spin relaxation,in which microscopic inhomogeneities play a key role for the low energy spin excitations related to skyrmions.
资源类型:期刊论文
原文链接:http://lib.cqvip.com/qk/85823A/201506/664946920.html
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