86 citations · 409 across the 14 of their papers we have counts for
14 papers
Containment efficiency and control strategies for the Corona pandemic costs
Claudius Gros, Roser Valenti, Lukas Schneider +2
The rapid spread of the Coronavirus (COVID-19) confronts policy makers with the problem of measuring the effectiveness of containment strategies, balancing public health considerat…
Multiferroic FeTeOBr: Alternating spin chains with frustrated interchain interactions
M. Pregelj, H. O. Jeschke, H. Feldner +11
A combination of density functional theory calculations, many-body model considerations, magnetization and electron spin resonance measurements shows that the multiferroic FeTe…
The antiferromagnetic/paramagnetic transition in mixed-spin compounds R2BaNiO5
J. V. Alvarez, Roser Valenti
We present an extensive Quantum Monte Carlo study of the magnetic properties of the mixed-spin quantum systems R2BaNiO5 (R= magnetic rare earth) which show coexistence of 3-dimensi…
Low Energy Singlets in the Excitation Spectrum of the Spin Tetrahedra System Cu_2Te_2O_5Br_2
P. Lemmens, K. Y. Choi, A. Ionescu +8
Low energy Raman scattering of the s=1/2 spin tetrahedra system Cu_2Te_2O_5Br_2 is dominated by an excitation at 18 cm^{-1} corresponding to an energy E_S=0.6Δ, with Δthe spin gap…
Evidence for an unconventional magnetic instability in the spin-tetrahedra system Cu_2Te_2O_5Br_2
P. Lemmens, K. -Y. Choi, E. E. Kaul +8
Thermodynamic experiments as well as Raman scattering have been used to study the magnetic instabilities in the spin-tetrahedra systems Cu_2Te_2O_5X_2, X=Cl and Br. While the phase…
Modeling the electronic behavior of -LiV2O5: a microscopic study
R. Valenti, T. Saha-Dasgupta, J. V. Alvarez +2
We determine the electronic structure of the one-dimensional spin-1/2 Heisenberg compound -LiVO, which has two inequivalent vanadium ions, V(1) and V(2), via density-fun…
A Generalized Ginzburg-Landau Approach to Second Harmonic Generation
Debanand Sa, R. Valenti, C. Gros
We develop a generalized Ginzburg-Landau theory for second harmonic generation (SHG) in magnets by expanding the free energy in terms of the order parameter in the magnetic phase a…
Novel Nonreciprocal Acoustic Effects in Antiferromagnets
Roser Valenti, Claudius Gros, V. N. Muthukumar
The possible occurrence of nonreciprocal acoustic effects in antiferromagnets in the absence of an external magnetic field is investigated using both (i) a microscopic formulation…
Spin-Peierls vs. Peierls distortions in a family of conjugated Polymers
M. A. Garcia-Bach, R. Valenti, D. J. Klein
Distortions in a family of conjugated polymers are studied within two complementary approaches, i.e. within a many-body Valence Bond (VB) approach using a transfer matrix technique…
Frustration induced Raman scattering in CuGeO_3
V. N. Muthukumar, Claudius Gros, Wolfgang Wenzel +7
We present experimental data for the Raman intensity in the spin-Peierls compound CuGeO_3 and theoretical calculations from a one-dimensional frustrated spin model. The theory is b…
Theory of Non-Reciprocal Optical Effects in Antiferromagnets: The Case Cr_2O_3
V. N. Muthukumar, Roser Valenti, Claudius Gros
A microscopic model of non-reciprocal optical effects in antiferromagnets is developed by considering the case of Cr_2O_3 where such effects have been observed. These effects are d…
A Microscopic Model of Non-Reciprocal Optical Effects in Cr_2 O_3
V. N. Muthukumar, Roser Valenti, Claudius Gros
This manuscript deals with the question "How does light couple to an antiferromagnetic order parameter"? For that we develop a microscopic model that explains the non-reciprocal op…
Spin-charge separation at small lengthscales in the 2D t-J model
Claudius Gros, Roser Valenti
We consider projected wavefunctions for the 2D model. For various wavefunctions, including correlated Fermi-liquid and Luttinger-type wavefunctions we present the static char…
Equation of motion approach to the Hubbard model in infinite dimensions
Claudius Gros
We consider the Hubbard model on the infinite-dimensional Bethe lattice and construct a systematic series of self-consistent approximations to the one-particle Green's function, $G…