Zobrazeno 1 - 10
of 139
pro vyhledávání: '"Gazza, C."'
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 first-order transition from a homogeneous or weakly-dimerized phase (
Externí odkaz:
http://arxiv.org/abs/2409.13446
We analyze the temperature evolution of the anomalous magnetic spectrum of the spin-1/2 triangular quantum Heisenberg antiferromagnet, which is proximate to a quantum critical point. Recently, its low energy excitations have been identified with two-
Externí odkaz:
http://arxiv.org/abs/2406.17165
We discuss a model scenario for multiferroic systems of type II (collinear spins) where the electric dipolar order competes with a frustrated magnetic order in determining the elastic distortions of the lattice ion positions. High magnetic frustratio
Externí odkaz:
http://arxiv.org/abs/2111.04896
Publikováno v:
Phys. Rev. B 103, 144421 (2021)
We introduce a microscopic model for collinear multiferroics capable to reproduce, as a consequence of magnetic frustration and easy-axis anisotropy, the so-called "uudd" (or antiphase) magnetic ordering observed in several type II multiferroic mater
Externí odkaz:
http://arxiv.org/abs/2012.15711
Publikováno v:
Phys. Rev. B 102, 224410 (2020)
We investigate the interplay between spatial anisotropy and further exchange interactions in the spin-$\frac{1}{2}$ Heisenberg antiferromagnetic model on a triangular lattice. We use the Schwinger boson theory by including Gaussian fluctuations above
Externí odkaz:
http://arxiv.org/abs/2009.05447
Publikováno v:
Phys. Rev. B 100, 235110 (2019)
Using the framework of the density-matrix renormalization group (DMRG), we study a quantum dot coupled to a superconducting nanowire with strong Rashba spin-orbit coupling. Regarding the singlet-to-doublet "0-$\pi$" transition that takes place when t
Externí odkaz:
http://arxiv.org/abs/1909.08486
Publikováno v:
Phys. Rev. B 100, 161111 (2019)
We propose a microscopic magneto-electric model in which the coupling between spins and electric dipoles is mediated by lattice distortions. The magnetic sector is described by a spin S=1/2 Heisenberg model coupled directly to the lattice via a stand
Externí odkaz:
http://arxiv.org/abs/1908.00312
Autor:
Gonzalez, M. G., Lisandrini, F. T., Blesio, G. G., Trumper, A. E., Gazza, C. J., Manuel, L. O.
Publikováno v:
Phys. Rev. Lett. 122, 017201 (2019)
Partial disorder --the microscopic coexistence of long-range magnetic order and disorder-- is a rare phenomenon, that has been experimental and theoretically reported in some Ising- or easy plane-spin systems, driven by entropic effects at finite tem
Externí odkaz:
http://arxiv.org/abs/1804.06720
Publikováno v:
Phys. Rev. B 97, 045144 (2018)
We calculate the width $2\Delta_{\text{CT}}$ and intensity of the charge-transfer peak (the one lying at the on-site energy $E_d$) in the impurity spectral density of states as a function of $E_d$ in the SU($N$) impurity Anderson model (IAM). We use
Externí odkaz:
http://arxiv.org/abs/1711.10835
Publikováno v:
Phys. Rev. B 96, 174423 (2017)
We investigate the effect of dimensional crossover in the ground state of the antiferromagnetic spin-$1$ Heisenberg model on the anisotropic triangular lattice that interpolates between the regime of weakly coupled Haldane chains ($J^{\prime}\! \!\ll
Externí odkaz:
http://arxiv.org/abs/1711.08471