Current around a power-law density inhomogeneity in 2D electron gas is exponentially suppressed within a no-go radius scaling with B, exhibiting spiraling patterns and a rotated resistivity dipole whose angle depends on the perturbation exponent.
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STM potentiometry on Bi films shows resistivity dipole amplitude scaling linearly with hole size at small defects then saturating at large defects, allowing extraction of Fermi wavevector and mean free path.
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Diffusive and hydrodynamic magnetotransport around a density perturbation in a two-dimensional electron gas
Current around a power-law density inhomogeneity in 2D electron gas is exponentially suppressed within a no-go radius scaling with B, exhibiting spiraling patterns and a rotated resistivity dipole whose angle depends on the perturbation exponent.
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Imaging the transition from diffusive to Landauer resistivity dipoles
STM potentiometry on Bi films shows resistivity dipole amplitude scaling linearly with hole size at small defects then saturating at large defects, allowing extraction of Fermi wavevector and mean free path.