Brijesh Kumar

most citedExact solution of the infinite-U Hubbard problem and other models in one dimension

27 citations · 100 across the 6 of their papers we have counts for

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cond-mat.str-el2008★ 27 cited

Exact solution of the infinite-U Hubbard problem and other models in one dimension

Brijesh Kumar

An interacting spin-fermion model is exactly solved on an open chain. In a certain representation, it is the nearest-neighbor Hubbard model in the limit of infinite $U$ (local inte…

cond-mat.str-el2008★ 11 cited

Fourfold degenerate columnar-dimer ground state in square lattice antiferromagnets

Rakesh Kumar, Brijesh Kumar

We construct and study two frustrated quantum spin-1/2 models on square lattice, which are like the antiferromagnetic $J_{1}$ - $J_{2}$ model with some additional four-spin exchange inte…