Zobrazeno 1 - 10
of 223
pro vyhledávání: '"M B Lopes"'
The structure of the electronic nonlinear optical conductivity is elucidated in a detailed study of the time-reversal symmetric two-band model. The nonlinear conductivity is decomposed as a sum of contributions related with different regions of the F
Externí odkaz:
http://arxiv.org/abs/2102.07629
Publikováno v:
J. Phys.: Condens. Matter 33 035901 (2020)
The Schr\"odinger equation in a square or rectangle with hard walls is solved in every introductory quantum mechanics course. Solutions for other polygonal enclosures only exist in a very restricted class of polygons, and are all based on a result ob
Externí odkaz:
http://arxiv.org/abs/2007.16176
In this work, we present the analytical expression for the second order divergence in the third order DC response of a cold semiconductor, which can be probed by different electric field setups. Results from this expression were then compared, for th
Externí odkaz:
http://arxiv.org/abs/2004.01919
Publikováno v:
Physical Review B 99, 205148 (2019)
The possibility of having a delocalization transition in the 1D de Moura-Lyra class of models (having a power-spectrum $\propto q^{-\alpha})$ has been the object of a long standing discussion in the literature, filled with ambiguities. In this letter
Externí odkaz:
http://arxiv.org/abs/1903.02335
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 harmonic generation, the optical rectification and the optical Kerr eff
Externí odkaz:
http://arxiv.org/abs/1902.04438
Publikováno v:
Journal of Physics: Condensed Matter 31, 175501 (2019)
We investigate the spectral function of Bloch states in an one-dimensional tight-binding non-interacting chain with two different models of static correlated disorder, at zero temperature. We report numerical calculations of the single-particle spect
Externí odkaz:
http://arxiv.org/abs/1806.06584
Autor:
Passos, D. J., Ventura, G. B., Lopes, J. M. Viana Parente, Santos, J. M. B. Lopes dos, Peres, N. M. R.
Publikováno v:
Phys. Rev. B 97, 235446 (2018)
In this work, the difficulties inherent to perturbative calculations in the velocity gauge are addressed. In particular, it is shown how calculations of nonlinear optical responses in the independent particle approximation can be done to any order an
Externí odkaz:
http://arxiv.org/abs/1712.04924
Autor:
Ventura, G. B., Passos, D. J., Santos, J. M. B. Lopes dos, Lopes, J. M. Viana Parente, Peres, N. M . R.
Publikováno v:
Phys. Rev. B 96, 035431 (2017)
The formalism of the reduced density matrix is pursued in both length and velocity gauges of the perturbation to the crystal Hamiltonian. The covariant derivative is introduced as a convenient representation of the position operator. This allow us to
Externí odkaz:
http://arxiv.org/abs/1703.07796
Publikováno v:
Communications Biology, Vol 4, Iss 1, Pp 1-10 (2021)
Braun et al. investigate the effects of PI 4-kinases and their lipid product, PI4P, in KCNQ channel function and sub-cellular localization. These results suggest a possible harmful effect of PI4K inhibition on cardiac electrophysiology and suggest th
Externí odkaz:
https://doaj.org/article/8c9886eab66a4d82823f36e53795ed0a
Publikováno v:
J. Phys.: Condens. Matter 25, 075303 (2013)
We develop an analytical scattering formalism for computing the transmittance through periodic defect lines within the tight-binding model of graphene. We first illustrate the method with a relatively simple case, the pentagon-only defect line. After
Externí odkaz:
http://arxiv.org/abs/1210.8294