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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…
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…
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…
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…
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…