Zobrazeno 1 - 10
of 109
pro vyhledávání: '"Pedersen, T G"'
Autor:
Gjerding, M. N., Taghizadeh, A., Rasmussen, A., Ali, S., Bertoldo, F., Deilmann, T., Holguin, U. P., Knøsgaard, N. R., Kruse, M., Manti, S., Pedersen, T. G., Skovhus, T., Svendsen, M. K., Mortensen, J. J., Olsen, T., Thygesen, K. S.
Publikováno v:
2D Mater. 8 (2021) 044002
The C2DB is a highly curated open database organizing a wealth of computed properties for more than 4000 atomically thin two-dimensional (2D) materials. Here we report on new materials and properties that were added to the database since its first re
Externí odkaz:
http://arxiv.org/abs/2102.03029
Raman spectroscopy is frequently used to identify composition, structure and layer thickness of 2D materials. Here, we describe an efficient first-principles workflow for calculating resonant first-order Raman spectra of solids within third-order per
Externí odkaz:
http://arxiv.org/abs/2001.06313
Publikováno v:
Phys. Rev. B 100, 045411 (2019)
The magneto-optical response of monolayer transition metal dichalcogenides (TMDs), including excitonic effects, is studied using a nanoribbon geometry. We compute the diagonal optical conductivity and the Hall conductivity. Comparing the excitonic op
Externí odkaz:
http://arxiv.org/abs/1905.06651
Autor:
Taghizadeh, Alireza, Pedersen, T. G.
Publikováno v:
Phys. Rev. B 99, 235433 (2019)
We propose an analytical approach for calculating the linear and nonlinear optical (NLO) responses of monolayer transition metal dichalcogenides (TMDs) including excitonic effects. An effective Hamiltonian reproducing the trigonal warping (TW) of the
Externí odkaz:
http://arxiv.org/abs/1902.09141
Publikováno v:
Phys. Rev. B 99, 195407 (2019)
Two-dimensional materials constitute an exciting platform for nonlinear optics with large nonlinearities that are tunable by gating. Hence, gate-tunable harmonic generation and intensity-dependent refraction have been observed in e.g. graphene and tr
Externí odkaz:
http://arxiv.org/abs/1901.04362
Autor:
Taghizadeh, Alireza, Pedersen, T. G.
We propose and analyze a mechanism for inducing spin Hall currents in ordinary (1H phase) monolayer transition metal dichalcogenides (TMDs) due to the nonlinear process of optical rectification. The photo-induced spin current is proportional to the l
Externí odkaz:
http://arxiv.org/abs/1812.02596
Publikováno v:
Phys. Rev. B 99, 035416 (2019)
Using an equation of motion (EOM) approach, we calculate excitonic properties of monolayer transition metal dichalcogenides (TMDs) perturbed by an external magnetic field. We compare our findings to the widely used Wannier model for excitons in two-d
Externí odkaz:
http://arxiv.org/abs/1810.06277
Autor:
Taghizadeh, Alireza, Pedersen, T. G.
Publikováno v:
Phys. Rev. B 97, 205432 (2018)
We study the equivalence of four different approaches to calculate the excitonic linear and nonlinear optical response of multiband semiconductors. These four methods derive from two choices of gauge, i.e. length and velocity gauges, and two ways of
Externí odkaz:
http://arxiv.org/abs/1804.04869
Publikováno v:
Phys. Rev. B 98, 205420 (2018)
We compute the nonlinear optical response of doped mono- and bilayer graphene using the full dispersion based on tight-binding models. The response is derived with the density matrix formalism using the length gauge and is valid for any periodic syst
Externí odkaz:
http://arxiv.org/abs/1802.01430
Publikováno v:
Phys. Rev. B 96, 195413 (2017)
We study the effects of a truncated band structure on the linear and nonlinear optical response of crystals using four methods. These are constructed by (i) choosing either length or velocity gauge for the perturbation and (ii) computing the current
Externí odkaz:
http://arxiv.org/abs/1710.01300