Martínez Strasser, CarolinaBaba, YurikoDíaz Fernández, ÁlvaroDomínguez-Adame Acosta, Francisco2023-06-222023-06-222022-021386-947710.1016/j.physe.2021.115000https://hdl.handle.net/20.500.14352/72448©2022 Elsevier This work was supported by Ministerio de Ciencia e Innovacion, Spain (Grant PID2019-106820RB-C21).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.engjournal articlehttp://dx.doi.org/10.1016/j.physe.2021.115000https://www.sciencedirect.comopen access538.9SemiconductorGapHeterojunctionsSupersymmetryPb_(1-X)SN_(X)TeCore-shell nanoparticlesSurface statesTopological insulatorFísica de materialesFísica del estado sólido2211 Física del Estado Sólido