NMR study of the electron spin polarization in the fractional quantum Hall effect of a single quantum well: Spectroscopic evidence for domain formation
NMR study of the electron spin polarization in the fractional quantum Hall effect of a single quantum well: Spectroscopic evidence for domain formation
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DOI：
10.1103/physrevb.70.075318
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发表时间：
2004-08-01
影响因子：
3.7
通讯作者：
Wegscheider, W
中科院分区：
文献类型：
--
作者：
Stern, O;Freytag, N;Wegscheider, W
作者发展了一种将电阻探测（RD）核磁共振（NMR）与常规NMR相结合的方法来测定单GaAs量子阱中电子自旋极化。我们用这种方法研究了填充因子为nu=2/3的小电流和大电流的非极化-极化自旋跃迁。光谱观察到这两个偏振的域的形成在过渡。在nu=3/5和4/7时，也未发现具有完全、部分或无极化的域。测量了填充因子nu=1/3、1和2/3附近的异常NMR线形状。这种特殊性的NMR线可能不是由于skyrmions，如先前报道的nu=1。
The authors have developed a technique to determine the electron spin polarization in a single GaAs quantum well by combining resistance-detected (RD) nuclear magnetic resonance (NMR) with conventional NMR. We use this method to study the unpolarized-polarized spin transition at filling factor nu=2/3 for small and large currents. The formation of domains with these two polarizations at the transition was observed spectroscopically. Domains with full, partial, or no polarization were also uncovered at nu=3/5 and 4/7. An anomalous NMR line shape around filling factor nu=1/3, 1, and 2/3 was measured. This pecularity of the NMR line is probably not due to skyrmions, as previously reported for nu=1.