Abstract
We investigate the dispersive Casimir–Polder interaction between a rubidium atom and a suspended graphene sheet subjected to an external magnetic field . We demonstrate that this concrete physical system allows for an unprecedented control of dispersive interactions at micro- and nanoscales. Indeed, we show that the application of an external magnetic field can induce an reduction in the Casimir–Polder energy relative to its value without the field. We also show that sharp discontinuities emerge in the Casimir–Polder interaction energy for certain values of the applied magnetic field at low temperatures. Moreover, for sufficiently large distances, these discontinuities show up as a plateau-like pattern with a quantized Casimir–Polder interaction energy, in a phenomenon that can be explained in terms of the quantum Hall effect. In addition, we point out the importance of thermal effects in the Casimir–Polder interaction, which we show must be taken into account even for considerably short distances. In this case, the discontinuities in the atom-graphene dispersive interaction do not occur, which by no means prevents the tuning of the interaction in by the application of the external magnetic field.
- Received 29 August 2014
DOI:https://doi.org/10.1103/PhysRevA.90.052511
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