Comment on `On the Luttinger theorem concerning the number of particles in the ground states of systems of interacting fermions', arXiv:0711.0952v1, by B. Farid
Abstract
In his preprint, arXiv:0711.0952v1, Behnam Farid argues that the Luttinger theorem is valid not only for a metal but also for a Mott insulator if the chemical potential is calculated by taking the limit of vanishing temperature at fixed particle density. In contrast, we have found in our recent paper (Eur. Phys. J. B 59, 495 (2007) or arXiv:condmat/0602656) on the basis of a controlled strong coupling expansion that the Luttinger theorem is violated in this limit for a particlehole asymmetric twoband Mott insulator. In an extensive discussion of our result Farid argues that an arbitrarily weak breaking of particlehole symmetry leads to a destruction of the Mott insulating state at half filling. In this comment we point out that this is not correct.
 Publication:

arXiv eprints
 Pub Date:
 November 2007
 arXiv:
 arXiv:0711.3093
 Bibcode:
 2007arXiv0711.3093R
 Keywords:

 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 comment on arXiv:0711.0952v1, 2 pages