Zobrazeno 1 - 10
of 17
pro vyhledávání: '"F. B. Ramos"'
Publikováno v:
Nuclear Physics B, Vol 941, Iss , Pp 794-837 (2019)
We study a Y junction of spin-1/2 Heisenberg chains with an interaction that breaks both time-reversal and chain exchange symmetries, but not their product nor SU(2) symmetry. The boundary phase diagram features a stable disconnected fixed point at w
Externí odkaz:
https://doaj.org/article/45173660c49c4525a14225f355080a66
Weakly coupled Ising chains provide a condensed-matter realization of confinement. In these systems, kinks and antikinks bind into mesons due to an attractive interaction potential that increases linearly with the distance between the particles. Whil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dacad2fdea0fc142e120c78290417bd5
http://arxiv.org/abs/2005.03145
http://arxiv.org/abs/2005.03145
Publikováno v:
Journal of Physics Communications
At the core of every frustrated system, one can identify the existence of frustrated rings that are usually interpreted in terms of single--particle physics. We check this point of view through a careful analysis of the entanglement entropy of both m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::287b77123cd25a9b8ad57731e390782e
http://fulir.irb.hr/5439/
http://fulir.irb.hr/5439/
We show that a honeycomb lattice of Heisenberg spin-$1/2$ chains with three-spin junction interactions allows for controlled analytical studies of chiral spin liquids (CSLs). Tuning these interactions to a chiral fixed point, we find a Kalmeyer-Laugh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e4682d9138a84c58208320ede718018
Publikováno v:
Nuclear Physics B, Vol 941, Iss, Pp 794-837 (2019)
Nuclear Physics
Nuclear Physics
We study a Y junction of spin-1/2 Heisenberg chains with an interaction that breaks both time-reversal and chain exchange symmetries, but not their product nor SU(2) symmetry. The boundary phase diagram features a stable disconnected fixed point at w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01a7f3dd23edfa87c1f1dc8c31efd7bc
http://arxiv.org/abs/1811.06794
http://arxiv.org/abs/1811.06794
Publikováno v:
Physical Review B. 97
We show that a quantum spin circulator, a nonreciprocal device that routes spin currents without any charge transport, can be achieved in Y junctions of identical spin-$1/2$ Heisenberg chains coupled by a chiral three-spin interaction. Using bosoniza
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::173ca4784aac0b46a238b24532b1fb34
https://doi.org/10.1103/physrevb.97.220402
https://doi.org/10.1103/physrevb.97.220402
Frustrated spin systems can show phases with spontaneous breaking of spin-rotational symmetry without the formation of local magnetic order. We study the dynamic response of the spin-nematic phase of one-dimensional spin-1/2 systems, characterized by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4fa2edaf7052a8f7d87bb894a2c664f
Autor:
Nilton Cesar Nogueira dos Santos, Maria Emília Santos Pereira Ramos, Eneida Cerqueira, Adriana B. Cerqueira, Aline F. B. Ramos
Publikováno v:
Mutagenesis. 31(5)
Pulp therapy is the last resort for preserving deciduous teeth. However, the genotoxic and cytotoxic effects of many products used in this therapy are not well established. The aim of this study was to use the micronucleus test on bone marrow from mi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ce8f0afb640373f46fdd977a4a32ed7
https://pubmed.ncbi.nlm.nih.gov/27251419
https://pubmed.ncbi.nlm.nih.gov/27251419
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Physical Review B-Condensed Matter and Materials Physics, 93(19):195129. American Institute of Physics
Universidade de São Paulo (USP)
instacron:USP
Physical Review B-Condensed Matter and Materials Physics, 93(19):195129. American Institute of Physics
We study the influence of reflective boundaries on time-dependent responses of one-dimensional quantum fluids at zero temperature beyond the low-energy approximation. Our analysis is based on an extension of effective mobile impurity models for nonli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3d3388fd28aff09151b12c56953ec9d
https://doi.org/10.1103/physrevb.93.195129
https://doi.org/10.1103/physrevb.93.195129
Autor:
F. B. Ramos, D. Eloy
Publikováno v:
Journal of Magnetism and Magnetic Materials. 323:1934-1937
Using the transfer matrix technique, we investigated the magnetic properties of a ferromagnetic Ising chain with alternating-spins (S, S ′ ) and single-ion anisotropy. We have calculated some physical quantities of interest such as the z component
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47b28ba8d57629f38b2201f0fc40c378
https://doi.org/10.1016/j.jmmm.2011.02.016
https://doi.org/10.1016/j.jmmm.2011.02.016