Browsing by Author "Martín Ruiz, A."

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    Electromagnetic coupling and transport in a topological insulator-graphene hetero-structure
    (2023) Bonilla Moreno, Daniel; Castaño Yepes, J.D.; Martín Ruiz, A.; Muñoz, Enrique
    The electromagnetic coupling between hetero-structures made of different materials is of great interest, both from the perspective of discovering new phenomena, as well as for its potential applications in novel devices. In this work, we study the electromagnetic coupling of a hetero-structure made of a topological insulator (TI) slab and a single graphene layer, where the later presents a diluted concentration of ionized impurities. We explore the topological effects of the magneto-electric polarizability (MEP) of the TI, as well as its relative dielectric permittivity on the electrical conductivity in graphene at low but finite temperatures. Copyright © 2023, The Authors. All rights reserved.
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    Electromagnetic coupling and transport in a topological insulator–graphene heterostructure
    (2023) Bonilla Moreno, Daniel; Castaño Yepes, Jorge David; Martín Ruiz, A.; Muñoz, Enrique
    The electromagnetic coupling between heterostructures made of different materials is of great interest, both from the perspective of discovering new phenomena, as well as for its potential applications in novel devices. In this work, we study the electromagnetic coupling of a heterostructure made of a topological insulator (TI) slab and a single graphene layer, where the later presents a diluted concentration of ionized impurities. We explore the topological effects of the magnetoelectric polarizability of the TI, as well as its relative dielectric permittivity on the electrical conductivity in graphene at low but finite temperatures.
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    Exact solution of the Schrödinger equation for an hydrogen atom at the interface between the vacuum and a topologically insulating surface
    (2019) Bonilla Moreno, Daniel; Martín Ruiz, A.; Urrutia, L. F.
    When an hydrogen atom is brought near to the interface between θ-media, the quantum-mechanical motion of the electron will be affected by the electromagnetic interaction between the atomic charges and the θ-interface, which is described by an axionic extension of Maxwell electrodynamics in the presence of a boundary. In this paper we investigate the atom-surface interaction effects upon the energy levels and wave functions of an hydrogen atom placed at the interface between a θ-medium and the vacuum. In the approximation considered, the Schrödinger equation can be exactly solved by separation of variables in terms of hypergeometic functions for the angular part and hydrogenic functions for the radial part. In order to make such effects apparent we deal with unrealistic high values of the θ-parameter. We also compute the energy shifts using perturbation theory for a particular small value of θ and we demonstrate that they are in a very good agreement with the ones obtained from the exact solution.