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We have measured activation gaps for odd-integer quantum Hall states in aunidirectional lateral superlattice (ULSL) -- a two-dimensional electron gas(2DEG) subjected to a unidirectional periodic modulation of the electrostaticpotential. By comparing the activation gaps with those simultaneously measuredin the adjacent section of the same 2DEG sample without modulation, we findthat the gaps are reduced in the ULSL by an amount corresponding to the widthacquired by the Landau levels through the introduction of the modulation. Thedecrement of the activation gap varies with the magnetic field following thevariation of the Landau bandwidth due to the commensurability effect. Notably,the decrement vanishes at the flat band conditions.

Effect of Oscillating Landau Bandwidth on the Integer Quantum Hall Effect in a Unidirectional Lateral Superlattice