Laterally modulated 2D electron system in the extreme quantum limit

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 patt...

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Published in:Physical review letters 2004-01, Vol.92 (3), p.036802-036802, Article 036802
Main Authors: Melinte, S, Berciu, Mona, Zhou, Chenggang, Tutuc, E, Papadakis, S J, Harrison, C, De Poortere, E P, Wu, Mingshaw, Chaikin, P M, Shayegan, M, Bhatt, R N, Register, R A
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creator Melinte, S
Berciu, Mona
Zhou, Chenggang
Tutuc, E
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description 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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title Laterally modulated 2D electron system in the extreme quantum limit
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