Spin gap in the 2D electron system of GaAs/AlGaAs single heterojunctions in weak magnetic fields

Abstract

We study the interaction-enhanced spin gaps in the two-dimensional electron gas confined in GaAs/AlGaAs single heterojunctions subjected to weak magnetic fields. The values are obtained from the chemical potential jumps measured by magnetocapacitance. The gap increase with parallel magnetic field indicates that the lowest-lying charged excitations are accompanied with a single spin flip at the odd-integer filling factor nu=1 and nu=3, in disagreement with the concept of skyrmions.

arXiv commentas published

References in corpus (8)

• Evidence for Skyrmions and Single Spin Flips in the Integer Quantized Hall Effect
• Evidence of Skyrmion excitations about $\nu =1$ in n-Modulation Doped Single Quantum Wells by Inter-band Optical Transmission
• Spin Susceptibility of an Ultra-Low Density Two Dimensional Electron System
• Measurements of the density-dependent many-body electron mass in 2D GaAs/AlGaAs Heterostructures
• Strong enhancement of the valley splitting in a 2D electron system in silicon
• Direct measurements of the spin and the cyclotron gaps in a 2D electron system in silicon
• Simultaneous Excitation of Spins and Pseudospins in the Bilayer $\nu =1$ Quantum Hall State
• Landau Level Mixing and Skyrmion Stability in Quantum Hall Ferromagnets

Cited by in corpus (9)

• Direct measurements of the fractional quantum Hall effect gaps
• Filling factor dependence of the fractional quantum Hall effect gap
• Interaction mediated asymmetries of the quantized Hall effect
• Goldstone mode stochastization in quantum Hall ferromagnet
• The spin-split incompressible edge states within empirical Hartree approximation at intermediately large Hall samples
• Energy spectrum reconstruction at the edge of a two-dimensional electron system with strong spin-orbit coupling
• Edge electrostatics revisited
• Local investigation of the energy gap within the incompressible strip in the quantum Hall regime
• Observation of exchange Coulomb interactions in the quantum Hall state at nu=3