2002/04/30 by Akira Endo, A. Endo, Y. Iye +1 · 3 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.66.075333
published as Phys. Rev. B 66, 075333 (2002) · REVTeX, 5 pages, 3 figures, Some minor revisions, Added notes and references
arxiv created 2002/06/19 · openalex publication_date 2002/08/29 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have observed marked transport anisotropy in short period (a=92 nm) unidirectional lateral superlattices around filling factors \ensuremathν=5/2 and 7/2: magnetoresistance shows a sharp peak for current along the modulation grating while a dip appears for current across the grating. By altering the ratio a/l (with l=√\ensuremath\Elzxh/eB_\ensuremath⊥ the magnetic length) via changing the electron density ne, it is shown that the \ensuremathν=5/2 anisotropic features appear in the range 6.6\ensuremath\lesssima/l\ensuremath\lesssim7.2 varying their intensities, becoming most conspicuous at a/l\ensuremath≃6.7. The peak/dip broadens with temperature roughly preserving its height and depth up to 250 mK. Tilt experiments reveal that the structures are slightly enhanced by an in-plane magnetic field B_\ensuremath\Vert perpendicular to the grating but are almost completely destroyed by B_\ensuremath\Vert parallel to the grating. The observations suggest the stabilization of a unidirectional charge-density-wave or stripe phase by weak external periodic modulation at the second Landau level.