Wednesday, January 24, 2018

Microscopic characteristics of dynamic nuclear polarization and selective nuclear depolarization at the ν=2/3 spin phase transition


Fauzi, M.H., S. Watanabe, and Y. Hirayama, Microscopic characteristics of dynamic nuclear polarization and selective nuclear depolarization at the ν=2/3 spin phase transition. Applied Physics Letters, 2012. 101(16): p. 162105.


The ability to manipulate the nuclear spin degree of freedom in semiconductor quantum structures is necessary for development of nuclear spintronics based on solid-state systems. Here, we developed a method to selectively depolarize the nuclear spin, the ⟨+Iz⟩〈+Iz〉 or the ⟨−Iz⟩〈−Iz〉 component, residing in a GaAs quantum well specimen after dynamic nuclear polarization by applying radio frequencypulse to either spin-unpolarized or spin-polarized nuclear magnetic resonancelines obtained at the spin transition of the filling ν=2/3ν=2/3. Our results are evidence that the spin-unpolarized (spin-polarized) domain mediates the ⟨+Iz⟩〈+Iz〉 (⟨−Iz⟩〈−Iz〉) nuclear spin polarization.