Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-10-09
J. Phys. Soc. Jpn. 79 (2010) 034701
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 6 figures, minor revision
Scientific paper
10.1143/JPSJ.79.034701
We have measured activation gaps for odd-integer quantum Hall states in a unidirectional lateral superlattice (ULSL) -- a two-dimensional electron gas (2DEG) subjected to a unidirectional periodic modulation of the electrostatic potential. By comparing the activation gaps with those simultaneously measured in the adjacent section of the same 2DEG sample without modulation, we find that the gaps are reduced in the ULSL by an amount corresponding to the width acquired by the Landau levels through the introduction of the modulation. The decrement of the activation gap varies with the magnetic field following the variation of the Landau bandwidth due to the commensurability effect. Notably, the decrement vanishes at the flat band conditions.
Endo Akira
Iye Yasuhiro
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