Zobrazeno 1 - 10
of 984
pro vyhledávání: '"Rossini G"'
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 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, 014441 (2020)
A key concept in the emerging field of spintronics is the electric field control of spin precession via the effective magnetic field generated by the Rashba spin orbit interaction (RSOI). Here, by extensive Density Matrix Renormalization Group comput
Externí odkaz:
http://arxiv.org/abs/2004.06160
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
Publikováno v:
Phys. Rev. B 99, 205159 (2019)
The ground state phase diagram of a spin $S=1/2$ $XXZ$ Heisenberg chain with spatially modulated Dzyaloshinskii-Moriya (DM) interaction $ {\cal H}= \sum_n J\left[\left(S^x_n S^x_{n+1} +S^y_n S^y_{n+1}+\Delta S^z_n S^z_{n+1}\right)+(D_0+(-1)^n D_1)\le
Externí odkaz:
http://arxiv.org/abs/1902.09356
Publikováno v:
Phys. Rev. B 96, 205135 (2017)
We propose a spin valve device based on the interplay of a modulated spin-orbit interaction and a uniform external magnetic field acting on a quantum wire. Half-metal phases, where electrons with only a selected spin polarization exhibit ballistic co
Externí odkaz:
http://arxiv.org/abs/1709.02217
Publikováno v:
Phys. Rev. B 96, 054441 (2017)
We study the role of long range dipolar interactions on antiferromagnetic spin chains, from the classical $S\to \infty$ limit to the deep quantum case $S=1/2$, including a transverse magnetic field. To this end, we combine different techniques such a
Externí odkaz:
http://arxiv.org/abs/1704.03420
Autor:
Borzi, R. A., Albarracín, F. A. Gómez, Rosales, H. D., Rossini, G. L., Steppke, A., Prabhakaran, D., Mackenzie, A. P., Cabra, D. C., Grigera, S. A.
Publikováno v:
Nature Communications 7, 12592 (2016)
Among the frustrated magnetic materials, spin-ice stands out as a particularly interesting system. Residual entropy, freezing and glassiness, Kasteleyn transitions and fractionalisation of excitations in three dimensions all stem from a simple classi
Externí odkaz:
http://arxiv.org/abs/1608.02627
Publikováno v:
Eur. Phys. J. B, 88 7 (2015) 176
In this paper we study the frustrated J1-J2 quantum Heisenberg model on the square lattice for J2 > 2J1, in a magnetic field. In this regime the classical system is known to have a degenerate manifold of lowest energy configurations, where standard t
Externí odkaz:
http://arxiv.org/abs/1406.4872