@article{oai:tsukuba.repo.nii.ac.jp:00015320,
author = {初貝, 安弘 and Maruyama, Isao and Koide, Tetsuji and Hatsugai, Yasuhiro},
issue = {23},
journal = {Physical review B},
month = {Dec},
note = {application/pdf, A new type of external field 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 under the finite effective field. In addition, we discuss a quantum phase transition obtained by considering the symmetry-breaking field as a mean field of interchain hopping.},
title = {U(1) symmetry breaking in one-dimensional Mott insulators studied by the density matrix renormalization group method},
volume = {76},
year = {2007}
}