Orbital Currents in Extended Hubbard Models of High-TcCuprate Superconductors
نویسندگان
چکیده
منابع مشابه
Orbital currents in extended Hubbard models of high-Tc cuprate superconductors.
Motivated by the recent report of broken time-reversal symmetry and zero momentum magnetic scattering in underdoped cuprates, we investigate under which circumstances orbital currents circulating inside a unit cell might be stabilized in extended Hubbard models that explicitly include oxygen orbitals. Using Gutzwiller projected variational wave functions that treat on an equal footing all insta...
متن کاملSpinons and holons for the one-dimensional three-band Hubbard models of high-temperature superconductors.
The one-dimensional three-band Hubbard Hamiltonian is shown to be equivalent to an effective Hamiltonian that has independent spinon and holon quasiparticle excitations plus a weak coupling of the two. The spinon description includes both copper sites and oxygen hole sites leading to a one-dimensional antiferromagnet incommensurate with the copper lattice. The holons are spinless noninteracting...
متن کاملMagnetic states of the five-orbital Hubbard model for one-dimensional iron-based superconductors
The magnetic phase diagrams of models for quasi-one-dimensional compounds belonging to the ironbased-superconductor family are presented. The five-orbital Hubbard model and the real-space Hartree–Fock approximation are employed, supplemented by density functional theory to obtain the hopping amplitudes. Phase diagrams are constructed by varying the Hubbard U and Hund J couplings at zero tempera...
متن کاملOrbital currents in CuO
We developed a scheme to investigate parity and time-reversal-odd order parameters associated with orbital currents within the framework of first-principle calculations. By applying our approach on CuO we further explore the source of orbital currents in this material which where observed by resonant x-ray diffraction. The comparison of our calculation with the experimental measurements reveale...
متن کاملNo evidence for spontaneous orbital currents in numerical studies of three-band models for the CuO planes of high temperature superconductors.
We have numerically evaluated the current-current correlations for three-band models of the CuO planes in high-T(c) superconductors at hole doping x = 1/8. The results show no evidence for the orbital current patterns proposed by Varma. If such patterns exist, the associated energy is estimated to be smaller than 5 meV per link even if [formula: see text]. Assuming that the three-band models ar...
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 Letters
سال: 2009
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.102.017005