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We examine effects of inversion asymmetry of a GaAs/Al0.3Ga0.7As quantum well(QW) on electron-nuclear spin coupling in the fractional quantum Hall (QH)regime. Increasing the QW potential asymmetry at a fixed Landau-level fillingfactor (nu) with gate voltages suppresses the current-induced nuclear spinpolarization in the nu = 2/3 Ising QH ferromagnet, while it significantlyenhances the nuclear spin relaxation at general nu. These findings suggest thatmixing of different spin states due to the Rashba spin-orbit interactionstrongly affects the electron-nuclear spin coupling.Comment: 15 pages, 4 figure

Effects of Inversion Asymmetry on Electron-Nuclear Spin Coupling in Semiconductor Heterostructures: Possible Role of Spin-Orbit Interactions