Gervais G, Stormer H L, Tsui D C, Kuhns P L, Moulton W G, Reyes A P, Pfeiffer L N, Baldwin K W, West K W
Department of Physics, Columbia University, New York, New York 10027 USA.
Phys Rev Lett. 2005 May 20;94(19):196803. doi: 10.1103/PhysRevLett.94.196803. Epub 2005 May 18.
A resistively detected NMR technique was used to probe the two-dimensional electron gas in a GaAs/AlGaAs quantum well. The spin-lattice relaxation rate (1/T(1)) was extracted at near complete filling of the first Landau level by electrons. The nuclear spin of (75)As is found to relax much more efficiently with T --> 0 and when a well developed quantum Hall state with R(xx) approximately 0 occurs. The data show a remarkable correlation between the nuclear spin relaxation and localization. This suggests that the magnetic ground state near complete filling of the first Landau level may contain a lattice of topological spin texture, i.e., a Skyrmion crystal.
一种电阻检测核磁共振技术被用于探测砷化镓/铝镓砷量子阱中的二维电子气。在电子几乎完全填充第一朗道能级时提取了自旋-晶格弛豫率（1/T(1)）。发现当温度T趋于0且出现具有近似为0的R(xx)的良好发展的量子霍尔态时，砷（75）的核自旋弛豫效率更高。数据显示核自旋弛豫与局域化之间存在显著关联。这表明在第一朗道能级几乎完全填充时的磁性基态可能包含拓扑自旋纹理晶格，即斯格明子晶体。
