360 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of MinhoPT56 papers
- Universidade do PortoPT36 papers
- University of LisbonPT17 papers
- International Iberian Nanotechnology LaboratoryPT14 papers
- Instituto Superior TécnicoPT13 papers
- QuantaLabPT11 papers
- Centre National de la Recherche ScientifiqueFR10 papers
- Columbia UniversityUS10 papers
- Institució Catalana de Recerca i Estudis AvançatsES10 papers
- University of AveiroPT10 papers
- Beijing Computational Science Research CenterCN9 papers
- Institut des Hautes Études ScientifiquesFR9 papers
31 papers · 1 filter
From Bloch Oscillations to a Steady-State Current in Strongly Biased Mesoscopic Devices
J. M. Alendouro Pinho, J. P. Santos Pires, Simão M. João +2
It has long been known that quantum particles moving in a periodic lattice and subject to a constant force field undergo an oscillatory motion that is referred to as Bloch Oscillat…
Strongly coupled magnon-plasmon polaritons in graphene- 2D ferromagnet heterostructures
A. T. Costa, M. I. Vasilevskiy, J. Fernández-Rossier +1
Magnons and plasmons are two very different types of collective modes, acting on the spin and charge degrees of freedom, respectively. At first sight, the formation of hybrid plasm…
Theory of triangulene two-dimensional crystals
R. Ortiz, G. Catarina, J. Fernández-Rossier
Equilateral triangle-shaped graphene nanoislands with a lateral dimension of benzene rings are known as triangulenes. Individual triangulenes are open-shell molecules…
Excitonic instability in transition metal dichalcogenides
M. F. C. Martins Quintela, A. T. Costa, N. M. R. Peres
When transition-metal dichalcogenide monolayers lack inversion symmetry, their low-energy single particle spectrum can described by tilted massive Dirac Hamiltonians. The so-called…
Anomalous Transport Signatures in Weyl Semimetals with Point Defects
J. P. Santos Pires, Simão M. João, Aires Ferreira +2
We present the first theoretical study of transport properties of Weyl semimetals with point defects. Focusing on a class of time-reversal symmetric Weyl lattice models, we show th…
Nodal vacancy bound states and resonances in three-dimensional Weyl semimetals
J. P. Santos Pires, S. M. João, Aires Ferreira +2
The electronic structure of a cubic -symmetric Weyl semimetal is analysed in the presence of atomic-sized vacancy defects. Isolated vacancies are shown to generate nod…
Tunable Excitons in Rhombohedral Trilayer Graphene
M. F. C. Martins Quintela, N. M. R. Peres
Trilayer graphene is receiving an increasing level of attention due to its stacking--dependent magnetoelectric and optoelectric properties, and its more robust ferromagnetism relat…
Hubbard model for spin-1 Haldane chains
G. Catarina, J. Fernández-Rossier
The Haldane phase for antiferromagnetic spin-1 chains is a celebrated topological state of matter, featuring gapped excitations and fractional spin-1/2 edge states. Here, we provid…
Harnessing Ultraconfined Graphene Plasmons to Probe the Electrodynamics of Superconductors
A. T. Costa, P. A. D. Gonçalves, D. N. Basov +3
We show that the Higgs mode of a superconductor, which is usually challenging to observe by far-field optics, can be made clearly visible using near-field optics by harnessing ultr…
Magneto-optical Kerr effect in spin split two-dimensional massive Dirac materials
G. Catarina, N. M. R. Peres, J. Fernández-Rossier
Two-dimensional (2D) massive Dirac electrons possess a finite Berry curvature, with Chern number , that entails both a quantized dc Hall response and a subgap full-quarter…
KITE: high-performance accurate modelling of electronic structure and response functions of large molecules, disordered crystals and heterostructures
Simão M. João, Miša Anđelković, Lucian Covaci +3
We present KITE, a general purpose open-source tight-binding software for accurate real-space simulations of electronic structure and quantum transport properties of large-scale mo…
The magnetic Purcell effect: the case of an emitter near an antiferromagnet
Beatriz A. Ferreira, N. M. R. Peres
In this paper we discuss the magnetic Purcell effect of a magnetic dipole near a semi-infinite antiferromagnet. Contrary to the electric Purcell effect, the magnetic one is not so…
Landauer transport as a quasisteady state on finite chains under unitary quantum dynamics
J. P. Santos Pires, B. Amorim, J. M. Viana Parente Lopes
In this paper, we study the emergence of a Landauer transport regime from the quantum-mechanical dynamics of free electrons in a disordered tight-binding chain, which is coupled to…
Twisted bilayer graphene: low-energy physics, electronic and optical properties
G. Catarina, B. Amorim, Eduardo V. Castro +2
Van der Waals (vdW) heterostructures ---formed by stacking or growing two-dimensional (2D) crystals on top of each other--- have emerged as a new promising route to tailor and engi…
A study of the nonlinear optical response of the plain graphene and gapped graphene monolayers beyond the Dirac approximation
G. B. Ventura, D. J. Passos, J. M. Viana Parente Lopes +1
In this work, we present numerical results for the second and third order conductivities of the plain graphene and gapped graphene monolayers associated with the second and third h…
Transmission across a bilayer graphene region
Hadi Z. Olyaei, Pedro Ribeiro, Eduardo V. Castro
The transmission across a graphene bilayer region is calculated for two different types of connections to monolayer leads. A transfer matrix algorithm based on a tight binding mode…
Optical orientation with linearly polarized light in transition metal dichalcogenides
G. Catarina, J. Have, J. Fernández-Rossier +1
We study the optical properties of semiconducting transition metal dichalcogenide monolayers under the influence of strong out-of-plane magnetic fields, using the effective massive…
Dirac points merging and wandering in a model Chern insulator
Miguel Gonçalves, Pedro Ribeiro, Eduardo V. Castro
We present a model for a Chern insulator on the square lattice with complex first and second neighbor hoppings and a sublattice potential which displays an unexpectedly rich physic…
Excitons in hexagonal boron nitride single-layer: a new platform for polaritonics in the ultraviolet
F. Ferreira, A. J. Chaves, N. M. R. Peres +1
The electronic and optical properties of 2D hexagonal boron nitride are studied using first principle calculations. GW and BSE methods are employed in order to predict with better…
Probing the Ultimate Plasmon Confinement Limits with a Van der Waals heterostructure
David Alcaraz Iranzo, Sebastien Nanot, Eduardo J. C. Dias +11
The ability to confine light into tiny spatial dimensions is important for applications such as microscopy, sensing and nanoscale lasers. While plasmons offer an appealing avenue t…
Valley polarized magnetic state in hole-doped mono layers of transition metal dichalcogenides
João E. H. Braz, B. Amorim, Eduardo V. Castro
We compute the valley/magnetic phase diagram of mono layers of transition metal dichalcogenides in the hole doped region where spin-orbit effects are particularly relevant. Taking…
Magnetic-field-assisted transmission of THz waves through a graphene layer combined with a periodically perforated metallic film
Yu. V. Bludov, M. I. Vasilevskiy, N. M. R. Peres
We consider a graphene sheet encapsulated in a two-dimensional metallic grating and a substrate () and subjected to an external magnetic field (in Faraday con…
Improvements in the and Bethe-Salpeter-equation calculations on phosphorene
Fábio Ferreira, Ricardo Mendes Ribeiro
Phosphorene is a bidimensional material that has properties useful for semiconductor devices. In this work we studied the electronic and optical properties of this material using t…
Exciton-polaritons in 2D dichalcogenide layers placed in a planar microcavity: tuneable interaction between two Bose-Einstein condensates
Mikhail I. Vasilevskiy, Darío G. Santiago-Pérez, Carlos Trallero-Giner +2
Exciton-polariton modes arising from interaction between bound excitons in monolayer thin semiconductor sheets and photons in a Fabry-Perot microcavity are considered theoretically…