@article{ISI:000239377500046,
 abstract = {We analyze the effects of the on-site Coulomb repulsion U on a band
insulator using dynamical mean field theory (DMFT). We find the
surprising result that the gap is suppressed to zero at a critical U-c1
and remains zero within a metallic phase. At a larger U-c2 there is a
second transition from the metal to a Mott insulator, in which the gap
increases with increasing U. These results are qualitatively different
from Hartree-Fock theory which gives a monotonically decreasing but
nonzero insulating gap for all finite U.},
 article-number = {046403},
 author = {Garg, Arti and Krishnamurthy, H. R. and Randeria, Mohit},
 doi = {10.1103/PhysRevLett.97.046403},
 issn = {0031-9007},
 journal = {PHYSICAL REVIEW LETTERS},
 month = {JUL 28},
 number = {4},
 times-cited = {84},
 title = {Can correlations drive a band insulator metallic?},
 unique-id = {ISI:000239377500046},
 volume = {97},
 year = {2006}
}