| Issue |
EPL
Volume 150, Number 4, May 2025
|
|
|---|---|---|
| Article Number | 46001 | |
| Number of page(s) | 7 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/add36e | |
| Published online | 06 June 2025 | |
Nonresonant Casimir-Polder repulsion with a monolayer topological insulator(a)
Departamento de Química, Universidad Técnica Federico Santa María, Campus San Joaquin 7820275, Santiago, Chile
Received: 21 March 2025
Accepted: 2 May 2025
We investigate the behavior of the nonresonant Casimir-Polder force acting on a metastable polarized state of a two-level atomic system with a right-circularly polarized electric dipole transition in the presence of a monolayer topological insulator inhabiting an anomalous quantum Hall insulator state with a negative Chern number, finding that the force can be repulsive for a certain range within the far-field region. By considering stanene irradiated by circularly polarized monochromatic laser light as a material example of a monolayer topological insulator, we study the effect of the frequency dispersion in the conductivity tensor on the force behavior, finding that the dispersion generally leads to a slight downward shift of the force relative to that predicted by a nondispersive approximation, as well as a slight reduction of the range over which the force is repulsive.
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