Tailoring topological states of core-shell nanoparticles

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Martínez Strasser, Carolina and Baba, Yuriko and Díaz Fernández, Álvaro and Domínguez-Adame Acosta, Francisco (2022) Tailoring topological states of core-shell nanoparticles. Physica E: Low-dimensional Systems and Nanostructures, 136 . ISSN 1386-9477

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Official URL: http://dx.doi.org/10.1016/j.physe.2021.115000




Abstract

In this work we investigate novel spherical core-shell nanoparticles with band inversion. The core and the embedding medium are normal semiconductors while the shell material is assumed to be a topological insulator. The envelope functions are found to satisfy a Dirac-like equation that can be solved in a closed form. The core-shell nanoparticle supports midgap bound states located at both interfaces due to band inversion. These states are robust since they are topologically protected. The energy spectrum presents mirror symmetry due to the chiral symmetry of the Dirac-like Hamiltonian. As a major result, we show that the thickness of the shell acts as an additional parameter for the fine tuning of the energy levels, which paves the way for electronics and optoelectronics applications.


Item Type:Article
Additional Information:

©2022 Elsevier
This work was supported by Ministerio de Ciencia e Innovacion, Spain (Grant PID2019-106820RB-C21).

Uncontrolled Keywords:Semiconductor; Gap; Heterojunctions; Supersymmetry; Pb_(1-X)SN_(X)Te; Core-shell nanoparticles; Surface states; Topological insulator
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:69270
Deposited On:20 Dec 2021 12:38
Last Modified:20 Dec 2021 12:47

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