Ringlike structures in the density--magnetic-field ${\rho }_{xx}$ diagram of two-subband quantum Hall systems

Abstract

Motivated by recent experiments [Zhang \textit{et al.}, Phys. Rev. Lett. \textbf{95}, 216801 (2005) and Ellenberger \textit{et al.}, cond-mat/0602271] reporting novel ringlike structures in the density--magnetic-field ($n_{2D}$\emph{--B}) diagrams of the longitudinal resistivity ${\rho }_{xx}$ of quantum wells with two subbands, we investigate theoretically here the magneto-transport properties of these quantum-Hall systems. We determine ${\rho }_{xx}$ via both the Hartree and the Kohn-Sham self-consistent schemes plus the Kubo formula. While the Hartree calculation yields diamond-shaped structures in the $n_{2D}$\emph{--B} diagram, the calculation including exchange and correlation effects (Kohn-Sham) more closely reproduces the ringlike structures in the experiments.

4 pages, 1 figure (conference paper -- PASPS IV); v2: minor typos corrected

References in corpus (3)

• Resistance spikes and domain wall loops in Ising quantum Hall ferromagnets
• Ising Quantum Hall Ferromagnet in Magnetically Doped Quantum Wells
• Multiple Phases with the Same Quantized Hall Conductance in a Two-Subband System

Cited by in corpus (2)

• NMR Probing Spin Excitations in the Ring-Like Structure of a Two-Subband System
• Collapse of ${\rho }_{xx}$ ringlike structures in 2DEGs under tilted magnetic fields