U(1) symmetry breaking in one-dimensional Mott insulator studied by the Density Matrix Renormalization Group method

Details U(1) symmetry breaking in one-dimensional Mott insulator studied by the Density Matrix Renormalization Group method U(1) symmetry breaking in one-dimensional Mott insulator studied by the Density Matrix Renormalization Group method

2006-10-17

arxiv.org/abs/cond-mat/0610452v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures

Scientific paper

10.1103/PhysRevB.76.235105

A new type of external fields violating the particle number preservation is studied in one-dimensional strongly correlated systems by the Density Matrix Renormalization Group method. Due to the U(1) symmetry breaking, the ground state has fluctuation of the total particle number, which implies injection of electrons and holes from out of the chain. This charge fluctuation can be relevant even at half-filling because the particle-hole symmetry is preserved with the finite effective field. In addition, we discuss a quantum phase transition obtained by considering the symmetry-breaking fields as a mean field of interchain-hopping.

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