Anisotropy of Magnetoresistance Hysteresis around the nu=2/3 Quantum Hall State in Tilted Magnetic Field

作者：Iwata Kazuki^*; Morino Masayuki; Fukuda Akira; Kumada Norio; Ezawa Zyun Francis; Hirayama Yoshiro; Sawada Anju

来源：Journal of the Physical Society of Japan, 2010, 79(12): 123701.

DOI：10.1143/JPSJ.79.123701

• two-dimensional electron system
• fractional quantum Hall effect
• domain structure
• nuclear spin system
• hyperfine interaction
• spin-lattice relaxation rate
• dynamic nuclear polarization

We present an anisotropy of the hysteretic transport around the spin transition point at the Landau level filling factor nu = 2/3 in a tilted magnetic field. When the direction of the in-plane component of the magnetic field B-vertical bar vertical bar is normal to the probe current I, a strong hysteretic transport due to the current-induced nuclear spin polarization occurs. When B-parallel to is parallel to I, on the other hand, the hysteresis almost disappears. We also demonstrate that the nuclear spin lattice relaxation rate T-1(-1) at the transition point increases with decreasing angle between the directions of B parallel to and I. These results suggest that the morphology of electron spin domains around nu = 2/3 is affected by the current direction.

• 出版日期2010-12