A. Aligia

activity

19932026

most citedMechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect

522 citations · 2.8k across the 140 of their papers we have counts for

collaborators

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98 papers · 1 filter

cond-mat.str-el2026

Dispersion of low-energy optical excitations in NiPS $_{3}$ explained by singlet polaron theory

I. J. Hamad, C. S. Helman, A. E. Feiguin +2

Optical and resonant inelastic X-ray scattering (RIXS) experiments in the van der Waals antiferromagnet NiPS $_{3}$ have revealed narrow excitonic resonances near 1.5 eV whose microsc…

cond-mat.str-el2026

Phase transitions through excited-state level crossings and topological indicators: the case of the XXZ chain with staggered Ising interaction

B. F. Márquez, K. Hallberg, A. A. Aligia

We combine two ways of determining the phase diagram of the spin- $1/2$ XXZ chain with a staggered Ising interaction and uniform transverse exchange, based on exact diagonalization.…

cond-mat.str-el2026

Effect of spin-orbit coupling on spin and orbital ordering in Sr $_{n + 1}$ Cr $_{n}$ O $_{3 n + 1}$ , $n = 1, 2$

Cristian Fanjul, A. A. Aligia

We incorporate spin-orbit coupling (SOC) into effective Kugel-Khomskii models for the $n = 1$ and $n = 2$ members of the Ruddlesden-Popper series Sr $_{n + 1}$ Cr $_{n}$ O $_{3 n + 1}$ . These mode…

cond-mat.str-el2025

Probing Boundary Spins in the Su-Schrieffer-Heeger-Hubbard model

Armando A. Aligia, Alejandro M. Lobos, Lucila Peralta Gavensky +1

Studying boundary excitations provides a powerful approach to probe correlations in topological phases. We propose that localized spins near the ends of a Su-Schrieffer-Heeger-Hubb…

cond-mat.str-el2025

Low-energy structure and topology of the two-band Hubbard-Kanamori model

Nayara G. Gusmão, Germán Blesio, Armando Aligia +3

We investigate the Mott transition in a two-band Hubbard-Kanamori model using Dynamical Mean-Field Theory (DMFT) with the Density Matrix Renormalization Group (DMRG) and the Numeri…

cond-mat.str-el2024

Specific heat of Gd $^{3 +}$ and Eu $^{2 +}$ -based magnetic compounds

D. J. Garcia, J. G. Sereni, A. A. Aligia

We have studied theoretically the specific heat of a large number of non-frustrated magnetic structures described by the Heisenberg model for systems with total angular momentum $J…

cond-mat.str-el2024★ 2 cited

Structural transition, spontaneous formation of strong singlet dimers and metamagnetism in $S = 3/2$ magnetoelastic spin chains

C. J. Gazza, A. A. Aligia, A. O. Dobry +2

We study a one-dimensional antiferromagnetic-elastic model with magnetic ions having spin $S = 3/2$ . By extensive DMRG computations and complementary analytical methods, we uncover a…

cond-mat.str-el2024★ 7 cited

Phase diagram and topology of the XXZ chain with alternating bonds and staggered magnetic field

B. F. Márquez, N. Aucar Boidi, K. Hallberg +1

The XXZ spin-half chain has Heisenberg exchange interactions $J_{z}$ ( $J_{⊥}$ ) in the $z$ ( $x, y$ ) direction. The model has a transition from the spin-fluid phase for $-J_\perp < J_…

cond-mat.str-el2023

Anisotropy-driven topological quantum phase transition in magnetic impurities

Germán G. Blesio, Luis O. Manuel, Armando A. Aligia

A few years ago, a topological quantum phase transition (TQPT) has been found in Anderson and Kondo 2-channel spin-1 impurity models that include a hard-axis anisotropy term $DS_z^…

cond-mat.str-el2023★ 7 cited

Charge and spin gaps of the ionic Hubbard model with density-dependent hopping

Oscar A. Moreno Segura, Karen Hallberg, Armando A. Aligia

We calculate the charge gap $Δ E_{C}$ and the spin gap $Δ E_{S}$ of the ionic Hubbard chain including electron-hole symmetric density-dependent hopping. The vanishing of $Δ E_{C}$ ( $Δ E_{S}$ )…

cond-mat.str-el2023★ 1 cited

Phase diagram of the ionic Hubbard model with density-dependent hopping

P. Roura Bas, A. A. Aligia

We obtain the quantum phase diagram of the ionic Hubbard model including electron-hole symmetric density-dependent hopping. The boundaries of the phases are determined by crossing…

cond-mat.str-el2023★ 8 cited

Effective one-band models for the 1D cuprate Ba $_{2 - x}$ Sr $_{x}$ CuO $_{3 + δ}$

Adrian E. Feiguin, Christian Helman, Armando A. Aligia

We consider a multiband Hubbard model $H_{m}$ for Cu and O orbitals in Ba $_{2 - x}$ Sr $_{x}$ CuO $_{3 + δ}$ similar to the tree-band model for two-dimensional (2D) cuprates. The hopping param…

cond-mat.str-el2023★ 10 cited

Topological quantum phase transition in individual Fe Atoms on MoS $_{2}$ /Au(111)

G. G. Blesio, A. A. Aligia

In a recent experiment [Trishin et al., Phys. Rev. Lett. 127, 236801 (2021)] a rich physics was observed for Fe atoms on MoS $_{2}$ /Au(111), characterized by three different behaviors…

cond-mat.str-el2022★ 2 cited

Determination of superexchange interactions for the CuO $_{2}$ chains in LiCu $_{2}$ O $_{2}$

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 $_{2}$ chains of LiCu $_{2}$ O $_{2}$ . This model is further simplified to a low-energy…

cond-mat.str-el2022★ 25 cited

Topological invariants based on generalized position operators and application to the interacting Rice-Mele model

Armando A. Aligia

We discuss different properties and the ability of several topological invariants based on position operators to identify phase transitions, and compare with more accurate methods,…

cond-mat.str-el2022

Topological quantum phase transition of nickelocene on Cu(100)

G. G. Blesio, R. Žitko, L. O. Manuel +1

Local quantum phase transitions driven by Kondo correlations have been theoretically proposed in several magnetic nanosystems; however, clear experimental signatures are scant. Mod…

cond-mat.str-el2022★ 11 cited

Low-energy physics for an iron phthalocyanine molecule on Au(111)

A. A. Aligia

The system of an iron phthalocyanine molecule on the Au(111) surface, has been studied recently due to its peculiar properties. In particular, several surprising results of scannin…

cond-mat.str-el2021★ 24 cited

Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid

R. Žitko, G. G. Blesio, L. O. Manuel +1

The paradigm of Landau's Fermi liquid theory has been challenged with the finding of a strongly interacting Fermi liquid that cannot be adiabatically connected to a non-interacting…

cond-mat.str-el2021

Ginzburg-Landau theory for the magnetic and structural transitions in La $_{1 - y}$ (Ca $_{1 - x}$ Sr $_{x}$ ) $_{y}$ MnO $_{3}$

L. M. León Hilario, A. A. Aligia

We present a phenomenological theory for the ferromagnetic transition temperature, the magnetic susceptibility at high temperatures, and the structural distortion in the La $_{1 - y}$ …

cond-mat.str-el2020★ 11 cited

Comment on "Relevance of Cu-3d multiplet structure in models of high Tc cuprates''

A. A. Aligia

In a recent work [M. Jiang, M. Moeller, M. Berciu, and G. A. Sawatzky, Phys. Rev. B \textbf{101}, 035151 (2020)], the authors solved a model with a Cu impurity in an O-2p band as a…

cond-mat.str-el2019★ 8 cited

Destructive quantum interference in transport through molecules with electron-electron and electron-vibration interactions

P. Roura-Bas, F. Güller, L. Tosi +1

We study the transport through a molecular junction exhibiting interference effects. We show that these effects can still be observed in the presence of molecular vibrations if Cou…

cond-mat.str-el2019★ 24 cited

Fully compensated Kondo effect for a two-channel spin S=1 impurity

G. G. Blesio, L. O. Manuel, A. A. Aligia +1

We study the low-temperature properties of the generalized Anderson impurity model in which two localized configurations, one with two doublets and the other with a triplet, are mi…

cond-mat.str-el2018★ 19 cited

Relation between width of the zero-bias anomaly and Kondo temperaure in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads

Diego Pérez Daroca, Pablo Roura-Bas, Armando A. Aligia

The zero-bias anomaly at low temperatures, originated by the Kondo effect when an electric current flows through a system formed by a spin- $1/2$ quantum dot and two metallic contac…

cond-mat.str-el2018★ 11 cited

Spin and orbital ordering in bilayer Sr $_{3}$ Cr $_{2}$ O $_{7}$

A. A. Aligia, C. Helman

Using maximally localized Wannier functions obtained from DFT calculations, we derive an effective Hubbard Hamiltonian for a bilayer of Sr $_{3}$ Cr $_{2}$ O $_{7}$ , the $n = 2$ member of the R…

Dispersion of low-energy optical excitations in NiPS3​ explained by singlet polaron theory

Phase transitions through excited-state level crossings and topological indicators: the case of the XXZ chain with staggered Ising interaction

Effect of spin-orbit coupling on spin and orbital ordering in Srn+1​Crn​O3n+1​, n=1,2

Probing Boundary Spins in the Su-Schrieffer-Heeger-Hubbard model

Low-energy structure and topology of the two-band Hubbard-Kanamori model

Specific heat of Gd3+ and Eu2+-based magnetic compounds

Structural transition, spontaneous formation of strong singlet dimers and metamagnetism in S=3/2 magnetoelastic spin chains

Phase diagram and topology of the XXZ chain with alternating bonds and staggered magnetic field

Anisotropy-driven topological quantum phase transition in magnetic impurities

Charge and spin gaps of the ionic Hubbard model with density-dependent hopping

Phase diagram of the ionic Hubbard model with density-dependent hopping

Effective one-band models for the 1D cuprate Ba2−x​Srx​CuO3+δ​

Topological quantum phase transition in individual Fe Atoms on MoS2​/Au(111)

Determination of superexchange interactions for the CuO2​ chains in LiCu2​O2​

Topological invariants based on generalized position operators and application to the interacting Rice-Mele model

Topological quantum phase transition of nickelocene on Cu(100)

Low-energy physics for an iron phthalocyanine molecule on Au(111)

Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid

Ginzburg-Landau theory for the magnetic and structural transitions in La1−y​(Ca1−x​Srx​)y​MnO3​

Comment on "Relevance of Cu-3d multiplet structure in models of high Tc cuprates''

Destructive quantum interference in transport through molecules with electron-electron and electron-vibration interactions

Fully compensated Kondo effect for a two-channel spin S=1 impurity

Relation between width of the zero-bias anomaly and Kondo temperaure in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads

Spin and orbital ordering in bilayer Sr3​Cr2​O7​

Dispersion of low-energy optical excitations in NiPS $_{3}$ explained by singlet polaron theory

Effect of spin-orbit coupling on spin and orbital ordering in Sr $_{n + 1}$ Cr $_{n}$ O $_{3 n + 1}$ , $n = 1, 2$

Specific heat of Gd $^{3 +}$ and Eu $^{2 +}$ -based magnetic compounds

Structural transition, spontaneous formation of strong singlet dimers and metamagnetism in $S = 3/2$ magnetoelastic spin chains

Effective one-band models for the 1D cuprate Ba $_{2 - x}$ Sr $_{x}$ CuO $_{3 + δ}$

Topological quantum phase transition in individual Fe Atoms on MoS $_{2}$ /Au(111)

Determination of superexchange interactions for the CuO $_{2}$ chains in LiCu $_{2}$ O $_{2}$

Ginzburg-Landau theory for the magnetic and structural transitions in La $_{1 - y}$ (Ca $_{1 - x}$ Sr $_{x}$ ) $_{y}$ MnO $_{3}$

Spin and orbital ordering in bilayer Sr $_{3}$ Cr $_{2}$ O $_{7}$