Browsing by Author "Castaño Yepes, Jorge David"

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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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    Inversion Symmetry Breaking in the Probability Density by Surface‐Bulk Hybridization in Topological Insulators
    (2024) Castaño Yepes, Jorge David; Muñoz Tavera, Enrique
    The probability density distribution is analyzed in a topological insulator (TI) slab of finite thickness, where the bulk and surface states are allowed to hybridize. By using an effective continuum Hamiltonian approach as a theoretical framework, the wave functions are analytically obtained for each state near the -point. The results reveal that, under particular combinations of the hybridized bulk and surface states, the spatial symmetry of the electronic probability density with respect to the center of the slab can be spontaneously broken. This symmetry breaking arises as a combination of the parity of the solutions, their spin projection, and the material constants.