Ettingshausen Effect around Landau Level Filling Factor nu=3 Studied by Dynamic Nuclear Polarization
Abstract
Spin current perpendicular to the electric current is investigated around Landau level filling factor =3 in a GaAs/AlGaAs two-dimensional electron system. Measurements of dynamic nuclear polarization in the vicinity of the edge of a specially designed Hall bar sample indicate that the direction of the spin current with respect to the Hall electric field reverses its polarity at =3, where the dissipative current carried by holes in the spin up Landau level is replaced with that by electrons in the spin down Landau level.
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