Ettingshausen effect around a Landau level filling factor nu = 3 studied by dynamic nuclear polarization.
A spin current perpendicular to the electric current is investigated around a Landau level filling factor nu=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 nu=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.
Komori
Yosuke
Y
Department of Physics, University of Tokyo, 7-3-1 Hongo, Tokyo, Japan.
Sakuma
Satoru
S
Okamoto
Tohru
T