Quantum critical behavior of the one-dimensional ionic Hubbard model

Details Quantum critical behavior of the one-dimensional ionic Hubbard model Quantum critical behavior of the one-dimensional ionic Hubbard model

2003-07-30

arxiv.org/abs/cond-mat/0307741v1

Phys. Rev. B 70, 155115 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 16 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.155115

We study the zero-temperature phase diagram of the half-filled one-dimensional ionic Hubbard model. This model is governed by the interplay of the on-site Coulomb repulsion and an alternating one-particle potential. Various many-body energy gaps, the charge-density-wave and bond-order parameters, the electric as well as the bond-order susceptibilities, and the density-density correlation function are calculated using the density-matrix renormalization group method. In order to obtain a comprehensive picture, we investigate systems with open as well as periodic boundary conditions and study the physical properties in different sectors of the phase diagram. A careful finite-size scaling analysis leads to results which give strong evidence in favor of a scenario with two quantum critical points and an intermediate spontaneously dimerized phase. Our results indicate that the phase transitions are continuous. Using a scaling ansatz we are able to read off critical exponents at the first critical point. In contrast to a bosonization approach, we do not find Ising critical exponents. We show that the low-energy physics of the strong coupling phase can only partly be understood in terms of the strong coupling behavior of the ordinary Hubbard model.

Affiliated with

Also associated with

No associations

Rating

Quantum critical behavior of the one-dimensional ionic Hubbard model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quantum critical behavior of the one-dimensional ionic Hubbard model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum critical behavior of the one-dimensional ionic Hubbard model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-662873