Zobrazeno 1 - 10
of 95
pro vyhledávání: '"Stegmann, Thomas"'
Autor:
Betancur-Ocampo, Yonatan, García, Santiago Galván y, Nuñez, Samuel Tehuacanero, Reyes-Gasga, José, Stegmann, Thomas, Sánchez-Ochoa, Francisco
The deposition of a two-dimensional material on the surface of a three-dimensional crystal can generate superlattices with electronic properties modified through the proximity spin-orbit effect. In this study, we found that Kekul\'e graphene superlat
Externí odkaz:
http://arxiv.org/abs/2409.18322
Autor:
Sánchez-Sánchez, Jesús Arturo, Navarro-Espino, Montserrat, Barrios-Vargas, José Eduardo, Stegmann, Thomas
We investigate the electronic structure and transport properties of twisted bilayer graphene (TBLG) at a twist angle of $\theta\approx 1.696\text{{\deg}}$. Using a combination of molecular dynamics and tight-binding calculations, we find two superlat
Externí odkaz:
http://arxiv.org/abs/2407.04668
Publikováno v:
Phys. Rev. B 107, 195424 (2023)
We study the electronic transport through uniformly bent carbon nanotubes. For this purpose, we describe the nanotube with the tight-binding model and calculate the local current flow by employing non-equilibrium Green's functions (NEGF) in the Keldy
Externí odkaz:
http://arxiv.org/abs/2302.01395
Publikováno v:
Phys. Rev. B 106, 035416 (2022)
We investigate the electronic transport in graphene nanoelectromechanical resonators (GrNEMS), known also as graphene nanodrums or nanomembranes. We demonstrate that these devices, despite small values of out-of-plane strain, between $0.1$ and $1\%$,
Externí odkaz:
http://arxiv.org/abs/2202.01739
We introduce a generalized Hamiltonian describing not only all topological phases observed experimentally in Kekul\'e graphene (KekGr) but predicting also new ones. These phases show features like a quadratic band crossing point, valley splitting, or
Externí odkaz:
http://arxiv.org/abs/2111.06001
Publikováno v:
Phys. Rev. B 105, 045401 (2022)
The effect of the Dirac cone tilt of anisotropic two-dimensional materials on the time evolution of coherent electron states in the presence of electric and magnetic fields is studied. We propose a canonical transformation that maps the anisotropic D
Externí odkaz:
http://arxiv.org/abs/2107.04160
Autor:
Sánchez-Sánchez, Jesús Arturo, Navarro-Espino, Montserrat, Betancur-Ocampo, Yonatan, Barrios-Vargas, José Eduardo, Stegmann, Thomas
A nanoelectronic device made of twisted bilayer graphene (TBLG) is proposed to steer the direction of the current flow. The ballistic electron current, injected at one edge of the bottom layer, can be guided predominantly to one of the lateral edges
Externí odkaz:
http://arxiv.org/abs/2106.06514
Autor:
Betancur-Ocampo, Yonatan, Majari, Parisa, Espitia, Diego, Leyvraz, Francois, Stegmann, Thomas
Publikováno v:
Phys. Rev. B 103, 155433 (2021)
The interplay of strain engineering and photon-assisted tunneling of electrons in graphene is considered for giving rise to atypical transport phenomena. The combination of uniaxial strain and a time-periodic potential barrier helps to control the pa
Externí odkaz:
http://arxiv.org/abs/2012.00233
Publikováno v:
Phys. Rev. B 103, 045404 (2021)
We investigate the electron transport in smooth graphene pn junctions, generated by gradually varying electrostatic potentials. The numerically calculated coherent current flow patterns can be understood largely in terms of semi-classical trajectorie
Externí odkaz:
http://arxiv.org/abs/2009.05535
Autor:
Sadurní, Emerson, Leyvraz, Francois, Stegmann, Thomas, Seligman, Thomas H., Klein, Douglas J.
The accidental degeneracy appearing in cycloacenes as triplets and quadruplets is explained with the concept of segmentation, introduced here with the aim of describing the effective disconnection of $\pi$ orbitals on these organic compounds. For per
Externí odkaz:
http://arxiv.org/abs/2008.02304