Zobrazeno 1 - 10
of 469
pro vyhledávání: '"Hallberg K"'
The XXZ spin-half chain has Heisenberg exchange interactions $J_z$ ($J_\perp$) in the $z$ ($x,y$) direction. The model has a transition from the spin-fluid phase for $-J_\perp < J_z < J_\perp$ to the N\'{e}el phase for $J_z > J_\perp >0$. When bond a
Externí odkaz:
http://arxiv.org/abs/2406.01760
Publikováno v:
Phys. Rev. B 109, 085122 (2024)
We study the non-degenerate one dimensional two-orbital Hubbard model with interorbital Coulomb interaction. By means of the density-matrix renormalization group technique, we calculate the local single-particle density of states and the optical cond
Externí odkaz:
http://arxiv.org/abs/2312.08284
We study fermions on a finite chain, interacting repulsively when residing on the same and on nearest-neighbor sites, and subjected to a Wannier-Stark linearly-varying potential. Using the density matrix renormalization-group numerical technique to s
Externí odkaz:
http://arxiv.org/abs/2310.00291
Publikováno v:
Phys. Rev. B 107, 085128 (2023)
Starting from \textit{ab-initio} calculations, we derive a five-band Hubbard model to describe the CuO$_2$ chains of LiCu$_2$O$_2$. This model is further simplified to a low-energy effective Heisenberg model with nearest-neighbor (NN) $J_1$, and next
Externí odkaz:
http://arxiv.org/abs/2212.03318
Publikováno v:
Phys. Rev. Research 3, 043213 (2021)
We study the electronic spectral properties at zero temperature of the one-dimensional (1D) version of the degenerate two-orbital Kanamori Hubbard model (KHM), one of the well established frameworks to study transition metal compounds, using state-of
Externí odkaz:
http://arxiv.org/abs/2112.03794
Autor:
Hallberg, K., Núñez-Fernández, Y.
Publikováno v:
Phys. Rev. B 102, 245138 (2020)
We calculate and resolve with unprecedented detail the local density of states (DOS) and momentum-dependent spectral functions at zero temperature of one of the key models for strongly correlated electron materials, the degenerate two-orbital Kanamor
Externí odkaz:
http://arxiv.org/abs/2007.14923
Autor:
Hallberg, K.
Publikováno v:
In Physica C: Superconductivity and its applications 15 October 2023 613
Autor:
Nunez-Fernandez, Y., Hallberg, K.
Publikováno v:
J. of Phys. Conf. Series, 1041 012002 (2018)
In this work we study the two-orbital Hubbard model on a square lattice in the presence of hybridization between nearest-neighbor orbitals and a crystal-field splitting. We use a highly reliable numerical technique based on the density matrix renorma
Externí odkaz:
http://arxiv.org/abs/1712.05025
Autor:
Fernández, Y. Núñez, Hallberg, K.
We implement an efficient numerical method to calculate response functions of complex impurities based on the Density Matrix Renormalization Group (DMRG) and use it as the impurity-solver of the Dynamical Mean Field Theory (DMFT). This method uses th
Externí odkaz:
http://arxiv.org/abs/1711.08745
Publikováno v:
Phys. Rev. B 97, 121113 (2018)
A repulsive Coulomb interaction between electrons in different orbitals in correlated materials can give rise to bound quasiparticle states. We study the non-hybridized two-orbital Hubbard model with intra (inter)-orbital interaction $U$ ($U_{12}$) a
Externí odkaz:
http://arxiv.org/abs/1710.08792