Electron/nuclear spin domain walls in quantum Hall systems
Electron/nuclear spin domain walls in quantum Hall systems
复制标题
量子霍尔系统中的电子/核自旋畴壁
DOI：
10.1103/physrevb.67.245311
复制
发表时间：
2001
影响因子：
3.7
通讯作者：
S. Girvin
中科院分区：
文献类型：
--
作者：
A. Mitra;S. Girvin
我们提出的实验，可以使用光泵核磁共振和全光核磁共振技术来创建空间调制的核自旋配置文件。由于超精细耦合，这些将表现为电子的空间调制的奥弗豪泽场，其幅度可以大到足以抵消甚至逆转某些地方的外部塞曼场。我们讨论了填充因子$\ensuremath {\nu}= 1 $的量子霍尔机制中的二维电子气输运，并证明了各种核自旋模式在电子气中诱导的集体模和拓扑激发的存在.我们计算了与这些低阶集体模耦合引起的核自旋的${1/T}{1}$弛豫率，并讨论了自旋轨道耦合对GaAs量子威尔斯阱中输运和低能模的影响。
We propose experiments that can be done using both optically pumped NMR and the technique of all-optical NMR for creating spatially modulated nuclear-spin profiles. Due to the hyperfine coupling these would appear as spatially modulated Overhauser fields for the electrons that could have an amplitude large enough to cancel or even reverse the external Zeeman field at some places. We discuss two-dimensional electron-gas transport in the quantum Hall regime at filling factor $\ensuremath{\nu}=1$ and demonstrate the existence of collective modes and topological excitations induced in the electron gas by various nuclear-spin patterns. We calculate the ${1/T}_{1}$ relaxation rate of the nuclear spins due to coupling with these low-lying collective modes and also discuss how transport and the low-energy modes would be affected by spin-orbit coupling in GaAs quantum wells grown in the $[001]$ and $[110]$ directions.
影响因子：
64.8
作者：
Smet, JH;Deutschmann, RA;von Klitzing, K
通讯作者：
von Klitzing, K