Tuning the Casimir-Polder interaction via magneto-optical effects in graphene

Cysne, Tarik P.; Kort-Kamp, Wilton J. M.; Oliver, Diego; Pinheiro, F. A.; Rosa, F. S. S.; Farina, C.

doi:10.1103/physreva.90.052511

Cited by 51 publications

(58 citation statements)

References 50 publications

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“…(24) is obtainable from Eq. (22) in the case that a summation over the discrete Matsubara frequencies is replaced with an integration along the imaginary frequency axis in accordance to the rule…”

Section: Peraturementioning

confidence: 99%

“…In the last few years much attention has been focused on the Casimir-Polder interaction of different atoms with graphene and graphene-coated substrates [19][20][21][22][23][24][25][26][27][28][29]. Graphene is a twodimensional sheet of carbon atoms packed in a hexagonal lattice which possesses unusual electrical, optical and mechanical properties [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature behavior of the Casimir-Polder free energy and entropy for an atom interacting with graphene

Mostepanenko

2018

Phys. Rev. A

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The analytic expressions for the free energy and entropy of the Casimir-Polder interaction between a polarizable and magnetizable atom and a graphene sheet are found in the limiting case of low temperature. In so doing, the response of graphene to electromagnetic fluctuations is described in the framework of the Dirac model by means of the polarization tensor in (2+1)-dimensional space-time. It is shown that the dominant contribution to the low-temperature behavior is given by an explicit dependence of the polarization tensor on temperature as a parameter. We demonstrate that the Lifshitz theory of atom-graphene interaction satisfies the Nernst heat theorem, i.e., is thermodynamically consistent. On this basis possible reasons of thermodynamic inconsistency arising for the Casimir-Polder and Casimir interactions in the case of Drude metals are discussed.The conclusion is made that although large thermal effect arising in the Casimir interaction between Drude metals at short separations should be considered as an artifact, the giant thermal effect predicted for graphene systems is an important physical phenomenon which awaits for its experimental observation.

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Section: Peraturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-temperature behavior of the Casimir-Polder free energy and entropy for an atom interacting with graphene

Mostepanenko

2018

Phys. Rev. A

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“…The Casimir-Polder interaction between an atom and a graphene surface with an applied magnetic field is studied in Ref. [37]. The authors observe plateau-like discontinuities of the Casimir-Polder interaction energy for specific values of the magnetic field and at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Casimir-Polder shift and decay rate in the presence of nonreciprocal media

2017

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We calculate the Casimir-Polder frequency shift and decay rate for an atom in front of a nonreciprocal medium by using macroscopic quantum electrodynamics. The results are a generalization of the respective quantities for matter with broken time-reversal symmetry which does not fulfill the Lorentz reciprocity principle. As examples, we contrast the decay rates, the resonant and nonresonant frequency shifts of a perfectly conducting (reciprocal) mirror to those of a perfectly reflecting nonreciprocal mirror. We find different power laws for the distance dependence of all quantities in the retarded and nonretarded limits. As an example of a more realistic nonreciprocal medium, we investigate a topological insulator subject to a time-symmetry breaking perturbation.

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“…Although the cross-polarization reflection coefficients r s,p and r p,s are non-vanishing in the case of graphene under the influence of an uniform static magnetic field, being responsible for Faraday and Kerr rotations, they do not contribute to the emitter's lifetime in the present situation (see Appendix A). The diagonal reflection coefficients are given by (Appendix B) [39][40][41] …”

Section: Methodsmentioning

confidence: 99%

Active magneto-optical control of spontaneous emission in graphene

et al. 2015

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We investigate the spontaneous emission rate of a two-level quantum emitter near a graphene-coated substrate under the influence of an external magnetic field or strain induced pseudo-magnetic field. We demonstrate that the application of the magnetic field can substantially increase or decrease the decay rate. We show that a suppression as large as 99% in the Purcell factor is achieved even for moderate magnetic fields. The emitter's lifetime is a discontinuous function of |B|, which is a direct consequence of the occurrence of discrete Landau levels in graphene. We demonstrate that, in the near-field regime, the magnetic field enables an unprecedented control of the decay pathways into which the photon/polariton can be emitted. Our findings strongly suggest that a magnetic field could act as an efficient agent for on-demand, active control of light-matter interactions in graphene at the quantum level.The possibility of tailoring light-matter interactions at a quantum level has been a sought-after goal in optics since the pioneer work of Purcell 1 , where it was first shown that the environment can strongly modify the spontaneous emission (SE) rate of a quantum emitter. To achieve such objective, several approaches have been proposed so far. One of them is to investigate SE in different system geometries [2][3][4][5][6][7][8][9][10][11] . Advances in nanofabrication techniques have not only allowed the increase of the spectroscopic resolution of molecules in complex environments 12 , but have also led to the use of nanometric objects, such as antennas and tips, to modify the lifetime, and enhance the fluorescence of single molecules [13][14][15][16] . The presence of metamaterials may also strongly affect quantum emitters' radiative processes. For instance, the impact of negative refraction and of the hyperbolic dispersion on the SE have been investigated [17][18][19] . Also, the influence of cloaking devices on the SE of atoms has been recently addressed 20 .Progress in plasmonics has also allowed for a unprecedented control of light-matter interactions at a quantum level. When the emitter is located near a plasmonic structure it may experience a strong enhancement of the local field. This effect can be exploited in the development of important applications in nanoplasmonics [21][22][23][24][25] . However, structures made of noble metals are hardly tunable, which unavoidably limit their application in photonic devices. To circumvent these limitations, graphene has emerged as an alternative plasmonic material due to its extraordinary electronic and optical properties [26][27][28][29][30][31] . Indeed, graphene hosts extremely confined plasmons, facilitating strong light-matter interactions [28][29][30][31] . In addition, the plasmon spectrum in doped graphene is highly tunable through electrical or chemical modification of the charge carrier density. Due to these properties, graphene is a promising material platform for several photonic applications, specially in the THz frequency range 30 . At the quantum leve...

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Tuning the Casimir-Polder interaction via magneto-optical effects in graphene

Cited by 51 publications

References 50 publications

Low-temperature behavior of the Casimir-Polder free energy and entropy for an atom interacting with graphene

Low-temperature behavior of the Casimir-Polder free energy and entropy for an atom interacting with graphene

Casimir-Polder shift and decay rate in the presence of nonreciprocal media

Active magneto-optical control of spontaneous emission in graphene

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