Zobrazeno 1 - 10
of 53
pro vyhledávání: '"F. C. Martins"'
Publikováno v:
GIScience & Remote Sensing, Vol 61, Iss 1 (2024)
Anthropogenic activities have significantly altered land cover on a global scale. These changes often have a negative effect on biodiversity limiting the distribution of species. The extent of the effect on species’ distribution depends on the land
Externí odkaz:
https://doaj.org/article/2ad8911a61284ecfb5150a3b9927fbf0
Biased bilayer graphene (BBG) is an important system for studies of excitonic effects in graphene--based systems, with its easily tunable bandgap. This bandgap is governed by an external gate voltage, allowing one to tune the optical response of the
Externí odkaz:
http://arxiv.org/abs/2405.04894
The optical properties of two-dimensional materials are exceptional in several respects. They are highly anisotropic and frequently dominated by excitonic effects. Dipole-allowed second order non-linear optical properties require broken inversion sym
Externí odkaz:
http://arxiv.org/abs/2304.08951
Publikováno v:
J. Phys.: Condens. Matter 35 035302 (2023)
With the ever-growing interest in quantum computing, understanding the behaviour of excitons in monolayer quantum dots has become a topic of great relevance. In this paper, we consider a Wannier exciton confined in a triangular quantum dot of hexagon
Externí odkaz:
http://arxiv.org/abs/2209.03331
Publikováno v:
Appl. Sci. 2022, 12(15), 7872
Scattering of excitons by free carriers is a phenomena which is especially important when considering moderately to heavily doped semiconductors in low temperature experiments, where the interaction of excitons with acoustic and optical phonons is re
Externí odkaz:
http://arxiv.org/abs/2207.08787
Publikováno v:
J. Phys.: Condens. Matter 34 455303 (2022)
When transition-metal dichalcogenide monolayers lack inversion symmetry, their low-energy single particle spectrum can described by tilted massive Dirac Hamiltonians. The so-called Janus materials fall into that category. Inversion symmetry can also
Externí odkaz:
http://arxiv.org/abs/2206.03416
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, 205417 (2022)
Trilayer graphene is receiving an increasing level of attention due to its stacking--dependent magnetoelectric and optoelectric properties, and its more robust ferromagnetism relative to monolayer and bilayer variants. Additionally, rhombohedral stac
Externí odkaz:
http://arxiv.org/abs/2202.06695
Publikováno v:
Phys. Rev. B 104, 205433 (2021)
In this paper, we employ a fully microscopic approach to the study of interlayer excitons in hetero-bilayers. We use Fowler's and Karplus' method to access the dynamical polarizability of non--interacting interlayer excitons in a $\mathrm{WSe}_{2}/\m
Externí odkaz:
http://arxiv.org/abs/2106.11738
Publikováno v:
Journal of the Optical Society of America B Vol. 38, Issue 7, pp. 2065-2074 (2021)
In this paper we develop a fully microscopic theory of the polarizability of excitons in transition metal dichalcogenides. We apply our method to the description of the excitation $2$p dark states. These states are not observable in absorption experi
Externí odkaz:
http://arxiv.org/abs/2012.03335