Electronic phase transitions in the half-filled ionic Hubbard model
نویسندگان
چکیده
منابع مشابه
Metallicity in the half-filled Holstein-Hubbard model
We re-examine the Peierls insulator to Mott insulator transition scenario in the one-dimensional Holstein-Hubbard model where, at half-filling, electron-phonon and electron-electron interactions compete for establishing chargeand spin-density-wave states, respectively. By means of large-scale density-matrix renormalization group calculations we determine the spin, single-particle and two-partic...
متن کاملHalf-filled stripes in the t-t-U Hubbard model
Using a self-consistent Hartree-Fock approximation we investigate the relative stability of various stripe phases in the extended t-t-U Hubbard model. One finds that a negative ratio of nextto nearest-neighbor hopping t/t < 0 expells holes from antiferromagnetic domains and reinforces the stripe order. Therefore the half-filled stripes not only accommodate holes but also redistribute them so th...
متن کاملGround-state and finite-temperature signatures of quantum phase transitions in the half-filled Hubbard model on a honeycomb lattice
Thereza Paiva,1 R. T. Scalettar,2 W. Zheng,3 R. R. P. Singh,2 and J. Oitmaa3 1Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68.528, 21945-970 Rio de Janeiro, RJ, Brazil 2Physics Department, University of California, Davis, California 95616, USA 3School of Physics, University of New South Wales, Sydney NSW 2052, Australia Received 22 June 2004; revised manuscript rece...
متن کاملQuantum-disentangled liquid in the half-filled Hubbard model
We investigate the existence of quantum disentangled liquid (QDL) states in the half-filled Hubbard model on bipartite lattices. In the one dimensional case we employ a combination of integrability and strong coupling expansion methods to argue that there are indeed finite energy-density eigenstates that exhibit QDL behaviour in the sense of J. Stat. Mech. P10010 (2014). The states exhibiting t...
متن کاملFerromagnetic Phase Transitions in the Hubbard Model
We show that the coupling of charge and spin density fluctuations in the three-dimensional Hubbard model with total charge fixed severely restricts the occurrence of a continuous ferromagnetic transition. This work focuses in one of a series of longstanding problems related to the one-band Hubbard model [I], namely the existence and nature of a finitetemperature ferromagnetic phase transition i...
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: 2008
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.78.075121