Physical Review Letters · 2004 · 57 citations · 10 references
EngineeringMany-body Quantum PhysicMagnetic ResonanceOne-dimensional MagnetismStrongly Correlated Electron SystemsMagnetoresistanceMagnetismExtreme Quantum LimitSuperconductivityQuantum MaterialsMagnetic Topological InsulatorQuantum TheoryQuantum ScienceElectrical EngineeringPhysicsDiagonal ResistivityQuantum MagnetismSpintronicsNatural SciencesTwo-dimensional Electron SystemTopological InsulatorApplied PhysicsCondensed Matter PhysicsQuantum SystemTopological HeterostructuresPeriodicity 39
We report on magnetotransport of a two-dimensional electron system (2DES), located 32 nm below the surface, with a surface superlattice gate structure of periodicity 39 nm imposing a periodic modulation of its potential. For low Landau level fillings nu, the diagonal resistivity displays a rich pattern of fluctuations, even though the disorder dominates over the periodic modulation. Theoretical arguments based on the combined effects of the long-wavelength, strong disorder and the short-wavelength, weak periodic modulation present in the 2DES qualitatively explain the data.
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Evidence of Hofstadter's Fractal Energy Spectrum in the Quantized Hall Conductance
C. Albrecht, J. H. Smet, K. von Klitzing et al. · Physical Review Letters · 2001 · 237 citations