99 citations · 455 across the 29 of their papers we have counts for
30 papers
Edge-state transport in gapped bilayer graphene
Jesús Arturo Sánchez-Sánchez, Thomas Stegmann
We investigate electronic transport in gapped bilayer graphene (gBLG) devices. For certain edge terminations -typically a combination of zigzag, armchair, and bearded types - we ob…
Electronic transport and anti-super-Klein tunneling in few-layer black phosphorous
Jorge Alfonso Lizarraga-Brito, Armando Arciniega-Gutiérrez, Yonatan Betancur-Ocampo +1
The electronic transport in few-layer black phosphorus (FLBP) nanoribbons is studied theoretically. The system is modeled on the basis of band-structures, which have been measured…
Kekulé distortions in graphene on cadmium sulfide
Yonatan Betancur-Ocampo, Santiago Galván y García, Samuel Tehuacanero Nuñez +3
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…
Edge-state transport in twisted bilayer graphene
Jesús Arturo Sánchez-Sánchez, Montserrat Navarro-Espino, José Eduardo Barrios-Vargas +1
We investigate the electronic structure and transport properties of twisted bilayer graphene (TBLG) at a twist angle of . Using a combination of molecular d…
Atomically thin current pathways in graphene through Kekulé-O engineering
Santiago Galván y García, Yonatan Betancur-Ocampo, Francisco Sánchez-Ochoa +1
We demonstrate that the current flow in graphene can be guided on atomically thin current pathways by means of the engineering of Kekulé-O distortions. A grain boundary in these di…
Electronic transport in bent carbon nanotubes
Eric Kleinherbers, Thomas Stegmann, Nikodem Szpak
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 f…
Graphene nanodrums as valleytronic devices
Walter Ortiz, Nikodem Szpak, Thomas Stegmann
We investigate the electronic transport in graphene nanoelectromechanical resonators (GrNEMS), known also as graphene nanodrums or nanomembranes. We demonstrate that these devices,…
Generalized Hamiltonian for Kekulé graphene and the emergence of valley-cooperative Klein tunneling
Santiago Galván y García, Thomas Stegmann, Yonatan Betancur-Ocampo
We introduce a generalized Hamiltonian describing not only all topological phases observed experimentally in Kekulé graphene (KekGr) but predicting also new ones. These phases show…
Valley-dependent time evolution of coherent electron states in tilted anisotropic Dirac materials
Yonatan Betancur-Ocampo, Erik Díaz-Bautista, Thomas Stegmann
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 stud…
Steering the current flow in twisted bilayer graphene
Jesús Arturo Sánchez-Sánchez, Montserrat Navarro-Espino, Yonatan Betancur-Ocampo +2
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…
Anomalous Floquet tunneling in uniaxially strained graphene
Yonatan Betancur-Ocampo, Parisa Majari, Diego Espitia +2
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 uniaxia…
Gradient-index electron optics in graphene pn junctions
Emmanuel Paredes-Rocha, Yonatan Betancur-Ocampo, Nikodem Szpak +1
We investigate the electron transport in smooth graphene pn junctions, generated by gradually varying electrostatic potentials. The numerically calculated coherent current flow pat…
Hidden duality and accidental degeneracy in cycloacene and Möbius cycloacene
Emerson Sadurní, Francois Leyvraz, Thomas Stegmann +2
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 effecti…
Phosphorene pnp junctions as perfect electron waveguides
Yonatan Betancur-Ocampo, Emmanuel Paredes-Rocha, Thomas Stegmann
The current flow in phosphorene pnp junctions is studied. At the interfaces of the junction, omni-directional total reflection takes place, named anti-super-Klein tunneling, as thi…
Current vortices in aromatic carbon molecules
Thomas Stegmann, John A. Franco-Villafañe, Yenni P. Ortiz +6
The local current flow through three small aromatic carbon molecules, namely benzene, naphthalene and anthracene, is studied. Applying density functional theory and the non-equilib…
Electron optics in phosphorene pn junctions: Negative reflection and anti super-Klein tunneling
Yonatan Betancur-Ocampo, François Leyvraz, Thomas Stegmann
Ballistic electrons in phosphorene junctions show optical-like phenomena. Phosphorene is modeled by a tight-binding Hamiltonian that describes its electronic structure at low…
Spectral and transport properties of a -symmetric tight-binding chain with gain and loss
Adrian Ortega, Thomas Stegmann, Luis Benet +1
We derive a continuity equation to study transport properties in a -symmetric tight-binding chain with gain and loss in symmetric configurations. This allows us to id…
Current splitting and valley polarization in elastically deformed graphene
Thomas Stegmann, Nikodem Szpak
Elastic deformations of graphene can significantly change the flow paths and valley polarization of the electric currents. We investigate these phenomena in graphene nanoribbons wi…
Robustness of optimal transport in disordered interacting many-body networks
Adrian Ortega, Thomas Stegmann, Luis Benet
The robustness of quantum transport under various perturbations is analyzed in disordered interacting many-body systems, which are constructed from the embedded Gaussian random mat…
Nonequilibrium distribution functions in electron transport: Decoherence, energy redistribution and dissipation
Thomas Stegmann, Orsolya Ujsághy, Dietrich E. Wolf
A new statistical model for the combined effects of decoherence, energy redistribution and dissipation on electron transport in large quantum systems is introduced. The essential i…
Transport gap engineering by contact geometry in graphene nanoribbons: Experimental and theoretical studies on artificial materials
Thomas Stegmann, John A. Franco-Villafañe, Ulrich Kuhl +2
Electron transport in small graphene nanoribbons is studied by microwave emulation experiments and tight-binding calculations. In particular, it is investigated under which conditi…
Efficient quantum transport in disordered interacting many-body networks
Adrian Ortega, Thomas Stegmann, Luis Benet
The coherent transport of fermions in disordered networks of single-particle states connected by -body interactions is studied. These networks are modeled by embedded Ga…
Chains of benzenes with lithium-atom adsorption: Vibrations and spontaneous symmetry breaking
Yenni P. Ortiz, Thomas Stegmann, Douglas J. Klein +1
We study effects of different configurations of adsorbates on the vibrational modes as well as symmetries of polyacenes and poly-p-phenylenes focusing on lithium atom adsorption. W…
Microwave emulations and tight-binding calculations of transport in polyacetylene
Thomas Stegmann, John A. Franco-Villafañe, Yenni P. Ortiz +3
A novel approach to investigate the electron transport of cis- and trans-polyacetylene chains in the single-electron approximation is presented by using microwave emulation measure…