We report the fabrication, magnetotransport, and heat capacity measurements on a GaAs/AlGaAs multiple double-quantum-well heterostructure in the quantum Hall (QH) regime. Magnetotransport data reveal the existence of a correlated QH state at total Landau level filling factor νt = 1. Near νt = 2, we observe the nuclear contribution to the measured heat capacity of the Ga and As atoms in GaAs quantum wells. The heat capacity data indicate that Skyrmions are the lowest-energy excitations of the νt = 2 ferromagnetic QH ground state.
|Physical Review B - Condensed Matter and Materials Physics
|Published - Nov 12 2003
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics