Comment on: "Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures" by C. Knecht, N. Bluemer, and P. G. J. van Dongen, cond-mat/0505106

TL;DR

This paper compares two sets of QMC/DMFT results for a non-isotropic two-band Hubbard model, demonstrating their agreement and refuting claims of discrepancies and corrections made by Knecht et al.

Contribution

It provides a detailed comparison confirming the consistency of results and challenges claims of new transitions and corrections in prior studies.

Findings

QMC/DMFT results are in excellent agreement

Claims of missing second transition are unfounded

High-precision data do not correct earlier results

Abstract

A detailed comparison of QMC/DMFT results for the non-isotropic two-band Hubbard model by Liebsch [Phys. Rev. B 70, 165103 (2004)] and C. Knecht, N. Bluemer, and P. G. J. van Dongen [cond-mat/0505106 (submitted to Phys. Rev. Lett.)] is given. Both results are shown to be in excellent agreement. Thus, the claims by Knecht et al.: ``The second transition [was] not seen in earlier studies using QMC and IPT'' and ``Our high-precision data correct earlier QMC results by Liebsch'' are shown to be unfounded.