Modulation of the Shubnikov-de Haas Oscillation in Unidirectional Lateral Superlattices

Details Modulation of the Shubnikov-de Haas Oscillation in Unidirectional Lateral Superlattices Modulation of the Shubnikov-de Haas Oscillation in Unidirectional Lateral Superlattices

2008-01-16

arxiv.org/abs/0801.2492v2

J. Phys. Soc. Jpn. 77 (2008) 054709

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 8 figures; typos corrected

Scientific paper

10.1143/JPSJ.77.054709

The amplitude and phase of Shubnikov-de Haas oscillations have been analyzed in detail for two-dimensional electron gases subjected to a weak unidirectional periodic potential modulation. The amplitude is suppressed, accompanied by inversion of the phase, at the maximum bandwidth conditions at low magnetic fields. The suppression is gradually taken over by the enhancement with the increase of the magnetic fields. The suppression and the enhancement are attributable to the collisional and the diffusion contribution of the modulated potential to the conductivity, respectively, the former (the latter) being dominant at low (high) magnetic fields. A theoretical calculation that takes the two types of contributions into account shows semi-quantitative agreement with experimental traces.

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