Disorder and interactions in quantum Hall ferromagnets near nu=1.

Article

关键词: OPTICALLY PUMPED NMR;    LANDAU-LEVEL;    SKYRME CRYSTAL;    WELLS;    STATES;    EXCITATIONS;    DYNAMICS;   

DOI  :  10.1103/PhysRevB.62.13579

来源: SCIE

【 摘 要 】

We report on a finite-size Hartree-Fock study of the competition between disorder and interactions in a two-dimensional electron gas near Landau-level filling factor nu =1. The ground state at nu =1 evolves with increasing disorder from a fully spin-polarized ferromagnet with a charge gap to a partially spin-polarized ferromagnetic Anderson insulator, to a quasimetallic paramagnet at the critical point between i=0 and i=2 quantum Hall plateaus. Away from nu =1, the ground state evolves from a ferromagnetic Skyrmion quasiparticle glass to a conventional quasiparticle glass, and finally to a conventional Anderson insulator. We comment on signatures of these different regimes in low-temperature transport and NMR line shape and peak position data.

【 授权许可】

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