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 $\nu =3$ 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.

4 pages, 5 figures

References in corpus (10)

• Electrically-Controlled Nuclear Spin Polarization and Relaxation by Quantum-Hall states
• A New Type of Electron Nuclear-Spin Interaction from Resistively Detected NMR in the Fractional Quantum Hall Effect Regime
• Collective Excitations, NMR, and Phase Transitions in Skyrme Crystals
• Dynamic nuclear polarization at the edge of a two-dimensional electron gas
• Quantum Hall Ferromagnetism in a Two-Dimensional Electron System
• Electrical read-out of the local nuclear polarization in the quantum Hall effect
• Hydrodynamic Equations in Quantum Hall Systems at Large Currents
• Thermohydrodynamics in Quantum Hall Systems
• Dynamic nuclear polarization induced by hot electrons
• Observation of the Ettingshausen effect in quantum Hall systems