Nonequilibrium Magnetization of a Two-Dimensional Electron Gas in a Static Magnetic Field

Abstract

Using a sensitive DC torque magnetometer we measure the orbital magnetization by sweeping the density at fixed magnetic fields on GaAs-AlGaAs heterostructures. At low temperatures strong nonequilibrium magnetization signals dominate the data. In literature the observation of nonequilibrium signals are often associated with eddy currents generated by sweeping the magnetic field. The elimination of a changing magnetic field then poses a question regarding the origin of these signals. Our data suggests another source of nonequilibrium magnetization potentially due to the change of area occupied by compressible and incompressible states as one sweeps the Fermi energy from one Landau level to the next.

12 pages 4 figures. Accepted to Physical Review B Nov 2005

References in corpus (1)

• Collapse of Spin-Splitting in the Quantum Hall Effect

Cited by in corpus (5)

• Theory of Orbital Magnetization in Solids
• Magnetization in two-dimensional electron gas in a perpendicular magnetic field: the roles of edge states and spin-orbit coupling
• Weakly chiral networks and 2D delocalized states in a weak magnetic field
• Measurements of the magnetic properties of conduction electrons
• Origin of the hysteresis in bilayer 2D systems in the quantum Hall regime