Zobrazeno 1 - 10
of 1 152
pro vyhledávání: '"Henriques, J. A."'
Autor:
Eini, Tomer, Quintela, M. F. C. Martins, Henriques, J. C. G., Ribeiro, R. M., Mazor, Yarden, Peres, N. M. R., Epstein, Itai
Collective excitations of charged particles under the influence of an electromagnetic field give rise to a rich variety of hybrid light-matter quasiparticles with unique properties. In metals, intraband collective response manifested by negative perm
Externí odkaz:
http://arxiv.org/abs/2412.03139
Altermagnets are a new class of magnetic materials with zero net magnetization (like antiferromagnets) but spin-split electronic bands (like ferromagnets) over a fraction of reciprocal space. As in antiferromagnets, magnons in altermagnets come in tw
Externí odkaz:
http://arxiv.org/abs/2405.12896
Autor:
Henriques, J. C. G., Jacob, D., Molina-Sánchez, A., Catarina, G., Costa, A. T., Fernández-Rossier, J.
The study of open-shell nanographenes has relied on a paradigm where spins are the only low-energy degrees of freedom. Here we show that some nanographenes can host low-energy excitations that include strongly coupled spin and orbital degrees of free
Externí odkaz:
http://arxiv.org/abs/2312.04938
Motivated by recent experimental breakthroughs, we propose a strategy to design two-dimensional spin lattices with competing interactions that lead to non-trivial emergent quantum states. We consider $S=1/2$ nanographenes with $C_3$ symmetry as build
Externí odkaz:
http://arxiv.org/abs/2312.01783
Nanographene triangulenes with a S = 1 ground state have been used as building blocks of antiferromagnetic Haldane spin chains realizing a symmetry protected topological phase. By means of inelastic electron spectroscopy, it was found that the interm
Externí odkaz:
http://arxiv.org/abs/2307.00991
Publikováno v:
Phys. Rev. Research 5, 043226 (2023)
We provide a comprehensive theory of magnetic phases in two-dimensional triangulene crystals, using both Hubbard model and density functional theory (DFT) calculations. We consider centrosymmetric and non-centrosymmetric triangulene crystals. In all
Externí odkaz:
http://arxiv.org/abs/2306.17153
Publikováno v:
J. Phys.: Condens. Matter 34 245802 (2022)
In this paper we consider a honeycomb antiferromagnet subject to an external laser field. Obtaining a time-independent effective Hamiltonian, we find that the external laser renormalizes the exchange interaction between the in-plane components of the
Externí odkaz:
http://arxiv.org/abs/2203.05809
Publikováno v:
Physica Status Solid B 2200097 (2022)
In this tutorial we introduce the reader to several theoretical methods of determining the exciton wave functions and the corresponding eigenenergies. The methods covered are either analytical, semi-analytical, or numeric. We make explicit all the de
Externí odkaz:
http://arxiv.org/abs/2202.12010
Publikováno v:
Phys. Rev. B 105, 115421 (2022)
In this paper we discuss the optical response due to the excitonic effect of two types of hBN bilayers: AB and AA'. Understanding the properties of these bilayers is of great utility to the study of twisted bilayers at arbitrary angles, since these t
Externí odkaz:
http://arxiv.org/abs/2201.06430
Publikováno v:
Phys. Rev. B 105, 045411 (2022)
Biased bilayer graphene, with its easily tunable band gap, presents itself as the ideal system to explore the excitonic effect in graphene based systems. In this paper we study the excitonic optical response of such a system by combining a tight bind
Externí odkaz:
http://arxiv.org/abs/2111.10555