Abstract
The normal-state energy spectrum of the two-dimensional t−J model in a homogeneous perpendicular magnetic eld B is investigated using the Mori projection operator technique. The density of states at the Fermi level as a function of 1/B reveals both highand low-frequency oscillations. The high-frequency oscillations correspond to large Fermi surfaces, while the low-frequency components are related to van Hove singularities in the Landau subbands, which stem from their bending due to strong electron correlations. Frequencies of the low-frequency components are of the same order of magnitude as those observed in underdoped cuprates. These components become dominant if smoothing processes are involved. It is shown that despite increased distances between subbands the pseudogap a ects only slightly the frequency of density of states oscillations.
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