Open AccessRinglike structures in the density–magnetic‐field ρ xx diagram of two‐subband quantum Hall systems
Author(s) -
Ferreira Gerson J.,
Freire Henrique J. P.,
Carlos Egues J.
Publication year - 2007
Publication title -
physica status solidi c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 46
eISSN - 1610-1642
pISSN - 1862-6351
DOI - 10.1002/pssc.200672856
Subject(s) - magnetic field , quantum hall effect , physics , condensed matter physics , diagram , hartree , quantum , field (mathematics) , phase diagram , quantum mechanics , mathematics , statistics , pure mathematics , phase (matter)
Motivated by recent experiments [Zhang et al. , Phys. Rev. Lett. 95 , 216801 (2005) and Ellenberger et al. , cond‐mat/0602271] reporting novel ringlike structures in the density–magnetic‐field ( n 2 D – B ) diagrams of the longitudinal resistivity ρ xx of quantum wells with two subbands, we investigate theoretically here the magneto‐transport properties of these quantum‐Hall systems. We determine ρ xx via both the Hartree and the Kohn‐Sham self‐consistent schemes plus the Kubo formula. While the Hartree calculation yields diamondshaped structures in the n 2 D – B diagram, the calculation including exchange and correlation effects (Kohn‐Sham) more closely reproduces the ringlike structures in the experiments. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)