342 citations · 1.2k across the 33 of their papers we have counts for
24 papers · 1 filter
Probing nonequilibrium transport and density profiles in tilted interacting fermion chains with local reservoirs
Andrea Nava, N. Aucar Boidi, Reinhold Egger +2
We investigate how local particle reservoirs can probe transport and density profiles in tilted spinless fermion chains with nearest-neighbor interactions. Using finite-chain Lindb…
Determination of superexchange interactions for the CuO chains in LiCuO
N. Aucar Boidi, Christian Helman, Y. Núñez-Fernández +2
Starting from \textit{ab-initio} calculations, we derive a five-band Hubbard model to describe the CuO chains of LiCuO. This model is further simplified to a low-energy…
In-gap band in the one-dimensional two-orbital Kanamori-Hubbard model with inter-orbital Coulomb interaction
N. Aucar Boidi, H. Fernández García, Y. Núñez-Fernández +1
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 esta…
Novel subbands in the doped two-orbital Kanamori-Hubbard model
K. Hallberg, Y. Núñez-Fernández
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 stro…
Renormalized dispersing multiplets in the spectrum of nearly Mott localized systems
Yashar Komijani, Karen Hallberg, Gabriel Kotliar
The spectrum of the strongly correlated systems usually shows resonant peaks at finite energy, with examples in the 115 Ce family which are reproduced by the dynamical mean-field t…
Solving the multi-site and multi-orbital Dynamical Mean Field Theory using Density Matrix Renormalization
Y. Núñez Fernández, K. Hallberg
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…
Emergent low-energy bound states in the two-orbital Hubbard model
Y. Nunez-Fernandez, G. Kotliar, K. Hallberg
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…
Spin-spin correlations between two Kondo impurities coupled to an open Hubbard chain
A. C. Tiegel, P. E. Dargel, K. A. Hallberg +2
In order to study the interplay between Kondo and Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, we calculate the spin-spin correlation functions between two Kondo impurities co…
Fused Azulenes: Possible Organic Multiferroics
Simil Thomas, S. Ramasesha, Karen Hallberg +1
We present compelling theoretical results showing that fused azulene molecules are strong candidates for exhibiting room temperature multiferroic behavior, i.e., having both, ferro…
Universal scaling in nonequilibrium transport through an Anderson impurity
Julian Rincon, A. A. Aligia, K. Hallberg
Using non-equilibrium renormalized perturbation theory, we calculate the conductance G as a function of temperature T and bias voltage V for an Anderson model, suitable for describ…
Features of spin-charge separation in the equilibrium conductance through finite rings
Julian Rincon, A. A. Aligia, K. Hallberg
We calculate the conductance through rings with few sites described by the model, threaded by a magnetic flux and weakly coupled to conducting leads at two arbitrary…
Spin-charge separation in strongly interacting finite ladder rings
Julian Rincon, K. Hallberg, A. A. Aligia
We study the conductance through Aharonov-Bohm finite ladder rings with strongly interacting electrons, modelled by the prototypical t-J model. For a wide range of parameters we ob…
Static and dynamical properties of elliptic quantum corrals
M. Nizama, K. Hallberg, J. d'Albuquerque e Castro
Due to their focalizing properties, elliptic quantum corrals present very interesting physical behaviors. In this work, we analyze static and dynamical properties of these systems.…
New Trends in Density Matrix Renormalization
Karen Hallberg
The Density Matrix Renormalization Group (DMRG) has become a powerful numerical method that can be applied to low-dimensional strongly correlated fermionic and bosonic systems. It…
Spin order in the one-dimensional Kondo and Hund lattices
D. J. Garcia, K. Hallberg, B. Alascio +1
We study numerically the one-dimensional Kondo and Hund lattices consisting of localized spins interacting antiferro or ferromagnetically with the itinerant electrons, respectively…
Detection of topological transitions by transport through molecules and nanodevices
A. A. Aligia, K. Hallberg, B. Normand +1
We analyze the phase transitions of an interacting electronic system weakly coupled to free-electron leads by considering its zero-bias conductance. This is expressed in terms of t…
Charge and spin conductance through a side-coupled quantum dot
M. E. Torio, K. Hallberg, C. Proetto
The zero-temperature magnetic field-dependent conductance of electrons through a one-dimensional non-interacting tight-binding chain with an interacting {\it side} dot is reviewed…
Dynamical Mean Field Theory with the Density Matrix Renormalization Group
Daniel J. Garcia, Karen Hallberg, Marcelo J. Rozenberg
A new numerical method for the solution of the Dynamical Mean Field Theory's self-consistent equations is introduced. The method uses the Density Matrix Renormalization Group techn…
Charge and spin inhomogeneous phases in the Ferromagnetic Kondo Lattice Model
D. J. Garcia, K. Hallberg, C. D. Batista +4
We study numerically the one-dimensional ferromagnetic Kondo lattice. This model is widely used to describe nickel and manganese perovskites. Due to the competition between double…
Quasiparticles and c-axis coherent hopping in high T_c superconductors
P. S. Cornaglia, K. Hallberg, C. A. Balseiro
We study the problem of the low-energy quasiparticle spectrum of the extended t-J model and analyze the coherent hopping between weakly coupled planes described by this model. Star…
New Type of Charge and Magnetic order in the Ferromagnetic Kondo Lattice
D. J. Garcia, K. Hallberg, C. D. Batista +2
We study numerically the one dimensional ferromagnetic Kondo lattice, a model widely used to describe nickel and manganese perovskites. By including a nearest neighbor Coulomb inte…
Solitonic approach to the dimerization problem in correlated one-dimensional systems
J. Málek, S. -L. Drechsler, G. Paasch +1
Using exact diagonalizations we consider self-consistently the lattice distortions in odd Peierls-Hubbard and spin-Peierls periodic rings in the adiabatic harmonic approximation. F…
Two-impurity Kondo problem for correlated electrons
Karen Hallberg, Reinhold Egger
The behavior of two magnetic impurities coupled to correlated electrons in one dimension is studied using the DMRG technique for several fillings. On-site Coulomb interactions amon…
Spectral functions of the 1D Hubbard model in the U -> \infty limit: How to use the factorized wave-function
Karlo Penc, Karen Hallberg, Frederic Mila +1
We give the details of the calculation of the spectral functions of the 1D Hubbard model using the spin-charge factorized wave-function for several versions of the U -> +\infty lim…