Incommensurate charge-density waves in the adiabatic Hubbard-Holstein model
نویسندگان
چکیده
منابع مشابه
Bipolaronic charge density waves and polaronic spin density waves in the Holstein-Hubbard model
At large electron-phonon coupling, the phonon of the Holstein-Hubbard model can be (generally) treated classically. Exact results can be obtained for this model at any band filling and any finite dimension where the Hubbard term with coefficient U is treated rigorously. The existence of chaotic bipolaronic states is proven when U is smaller than a certain value Uc and for an electron-phonon cou...
متن کاملCompetition between antiferromagnetic and charge-density-wave order in the half-filled Hubbard-Holstein model.
We present a determinant quantum Monte Carlo study of the competition between instantaneous on-site Coulomb repulsion and retarded phonon-mediated attraction between electrons, as described by the two-dimensional Hubbard-Holstein model. At half filling, we find a strong competition between antiferromagnetism (AFM) and charge-density-wave (CDW) order. We demonstrate that a simple picture of AFM-...
متن کاملCharge ordering and magnetism in quarter-filled Hubbard-Holstein model
Sanjeev Kumar1,2 and Jeroen van den Brink1,3 1Institute Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands 2Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands 3Institute for Molecules and Materials, Radboud Universiteit Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands Received 23 May ...
متن کاملSmall denominators and anomalous behaviour in the incommensurate Hubbard-Holstein model
Abstract. We consider a system of interacting fermions on a chain in a periodic potential incommensurate with the chain spacing. We derive a convergent perturbative expansion, afflicted by a small denominator problem and based on renormalization group, for the two point Schwinger function. We obtain the large distance behavior of the Schwinger function, which is anomalous and described by criti...
متن کاملMobile Bipolarons in the Adiabatic Holstein - Hubbard Model in 1 and 2 dimensions
The bound states of two electrons in the adiabatic Holstein-Hubbard model are studied numerically in one and two dimensions from the anticontinuous limit. This model involves a competition between a local electron-phonon coupling (with a classical lattice) which tends to form pairs of electrons and the repulsive Hubbard interaction U ≥ 0 which tends to break them. In 1D, the ground-state always...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2002
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.65.075113