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13 papers
Multiferroic Two-Dimensional Materials
L. Seixas, A. S. Rodin, A. Carvalho +1
The relation between unusual Mexican-hat band dispersion, ferromagnetism and ferroelasticity is investigated using a combination of analytical, first-principles and phenomenologica…
Generalized spectral method for near-field optical microscopy
B. -Y. Jiang, L. M. Zhang, A. H. Castro Neto +2
Electromagnetic interaction between a sub-wavelength particle (the `probe') and a material surface (the `sample') is studied theoretically. The interaction is shown to be governed…
Atomically thin dilute magnetism in Co-doped phosphorene
L. Seixas, A. Carvalho, A. H. Castro Neto
Two-dimensional dilute magnetic semiconductors can provide fundamental insights in the very nature of magnetic orders and their manipulation through electron and hole doping. Despi…
Collective modes in anisotropic double layer systems
A. S. Rodin, A. H. Castro Neto
We study collective modes in anisotropic double layer systems. To this end, we derive a zero- dynamic polarization function for a conductor with a paraboloidal dispersion. Follo…
Exciton binding energies and luminescence of phosphorene under pressure
L. Seixas, A. S. Rodin, A. Carvalho +1
The optical response of phosphorene can be gradually changed by application of moderate uniaxial compression, as the material undergoes the transition into an indirect gap semicond…
Excitons in anisotropic 2D semiconducting crystals
A. S. Rodin, A. Carvalho, A. H. Castro Neto
The excitonic behavior of anisotropic two-dimensional crystals is investigated using numerical methods. We employ a screened potential arising due to the system polarizability to s…
Phosphorene nanoribbons
A. Carvalho, A. S. Rodin, A. H. Castro Neto
Edge-induced gap states in finite phosphorene layers are examined using analytical models and density functional theory. The nature of such gap states depends on the direction of t…
Tunable optical properties of multilayers black phosphorus thin films
Tony Low, A. S. Rodin, A. Carvalho +4
Black phosphorus thin films might offer attractive alternatives to narrow gap compound semiconductors for optoelectronics across mid- to near-infrared frequencies. In this work, we…
Strain-induced gap modification in black phosphorus
A. S. Rodin, A. Carvalho, A. H. Castro Neto
The band structure of single-layer black phosphorus and the effect of strain are predicted using density functional theory and tight-binding models. Having determined the localized…
Excitonic Collapse in Semiconducting Transition Metal Dichalcogenides
A. S. Rodin, A. H. Castro Neto
Semiconducting transition metal dichalcogenides (STMDC) are two-dimensional (2D) crystals characterized by electron volt size band gaps, spin-orbit coupling (SOC), and d-orbital ch…
Gate-tuning of graphene plasmons revealed by infrared nano-imaging
Z. Fei, A. S. Rodin, G. O. Andreev +12
Surface plasmons are collective oscillations of electrons in metals or semiconductors enabling confinement and control of electromagnetic energy at subwavelength scales. Rapid prog…
Selected Topics in Graphene physics
Antonio H. Castro Neto
Graphene research is currently one of the largest fields in condensed matter. Due to its unusual electronic spectrum with Dirac-like quasiparticles, and the fact that it is a uniqu…
Observation of Van Hove singularities in twisted graphene layers
Guohong Li, A. Luican, J. M. B. Lopes dos Santos +4
Electronic instabilities at the crossing of the Fermi energy with a Van Hove singularity in the density of states often lead to new phases of matter such as superconductivity, magn…