Resistivity enhancement in quasiperiodic unidirectional lateral superlattices
Akira Endo, Yasuhiro Iye
Physica E 40 1145 (2008)
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Note: EP2DS17
Strong enhancement in the zero-magnetic-field resistivity, followed by negative magnetoresistance, has been observed for twodimensional
electron gases by introducing weak quasiperiodic (Fibonacci) potential modulation having a length scale close to
the Fermi wavelength. The extra resistivity increases with decreasing length scale notwithstanding the concomitant decrease
in the modulation amplitude, and also with decreasing temperature and increasing electron concentration. The enhancement
is qualitatively explained by backscattering due to Bragg reflections from the quasiperiodic superlattices characterized by a
dense set of reciprocal lattice vectors.