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(47) Production(s) de ANTEZZA M.


Spontaneous lateral atomic recoil force close to a photonic topological material
Auteur(s): Hassani gangaraj S. ali, Hanson George w., Antezza M., Silveirinha Mario
(Article) Publié:
Physical Review B, vol. 97 p.201108(R) (2018)
Ref HAL: hal01792421_v1
DOI: 10.1103/PhysRevB.97.201108
Exporter : BibTex  endNote
Résumé: We investigate the quantum recoil force acting on an excited atom close to the surface of a nonreciprocal photonic topological insulator (PTI). The main atomic emission channel is the unidirectional surface plasmon propagating at the PTIvacuum interface, and we show that it enables a spontaneous lateral recoil force that scales at short distances as 1/d^4, where d is the atomPTI separation. Remarkably, the sign of the recoil force is polarization and orientation independent, and it occurs in a translationinvariant homogeneous system in thermal equilibrium. Surprisingly, the recoil force persists for very small values of the gyration pseudovector, which, for a biased plasma, corresponds to very low cyclotron frequencies. The ultrastrong recoil force is rooted in the quasihyperbolic dispersion of the surface plasmons. We consider both an initially excited atom and a continuous pump scenario, the latter giving rise to a steady lateral force whose direction can be changed at will by simply varying the orientation of the biasing magnetic field. Our predictions may be tested in experiments with cold Rydberg atoms and superconducting qubits.



A selfcontained quantum harmonic engine
Auteur(s): Reid Brendan, Pigeon Simon, Antezza M., De chiara Gabriele
(Article) Publié:
Europhysics Letters (Epl), vol. 120 p.60006 (2018)
Ref HAL: hal01726096_v1
DOI: 10.1209/02955075/120/60006
Exporter : BibTex  endNote
Résumé: We propose a system made of three quantum harmonic oscillators as a compact quantum engine for producing mechanical work. The three oscillators play respectively the role of the hot bath, the working medium and the cold bath. The working medium performs an Otto cycle during which its frequency is changed and it is sequentially coupled to each of the two other oscillators. As the two environments are finite, the lifetime of the machine is finite and after a number of cycles it stops working and needs to be reset. Remarkably, we show that thismachine can extract more than 90% of the available energy during 70 cycles. Differently from usually investigated infinitereservoir configurations, this machine allows the protection of induced quantum correlations and we analyse the entanglement and quantum discord generated during the strokes. Interestingly, we show that high work generation is always accompanied by large quantum correlations. Our predictions can be useful for energy management at the nanoscale, and can be relevant for experiments with trapped ions and experiments with light in integrated optical circuits.



Fluctuationinduced forces on an atom near a photonic topological material
Auteur(s): Silveirinha Mario, Hassani gangaraj S. ali, Hanson George w., Antezza M.
(Article) Publié:
Physical Review A: Atomic, Molecular And Optical Physics, vol. 97 p.022509 (2018)
Texte intégral en Openaccess :
Ref HAL: hal01714025_v1
DOI: 10.1103/PhysRevA.97.022509
Exporter : BibTex  endNote
1 citation
Résumé: We theoretically study the CasimirPolder force on an atom in an arbitrary initial state in a rather general electromagnetic environment wherein the materials may have a nonreciprocal bianisotropic dispersive response. It is shown that under the Markov approximation the force has resonant and nonresonant contributions. We obtain explicit expressions for the optical force both in terms of the system Green function and of the electromagnetic modes. We apply the theory to the particular case wherein a twolevel system interacts with a topological gyrotropic material, showing that the nonreciprocity enables exotic lightmatter interactions and the opportunity to sculpt and tune the CasimirPolder forces on the nanoscale. With a quasistatic approximation, we obtain a simple analytical expression for the optical force and unveil the crucial role of surface plasmons in fluctuationinduced forces. Finally, we derive the Green function for a gyrotropic material halfspace in terms of a Sommerfeld integral.



CasimirLifshitz force for nonreciprocal media and applications to photonic topological insulators
Auteur(s): Fuchs Sebastian, Lindel Frider, Krems Roman, Hanson George w., Antezza M., Buhmann Stefan yoshi
(Article) Publié:
Physical Review A: Atomic, Molecular And Optical Physics, vol. 96 p.062505 (2017)
Texte intégral en Openaccess :
Ref HAL: hal01664518_v1
DOI: 10.1103/PhysRevA.96.062505
Exporter : BibTex  endNote
1 citation
Résumé: Based on the theory of macroscopic quantum electrodynamics, we generalize the expression of the Casimir force for nonreciprocal media. The essential ingredient of this result is the Green’s tensor between two nonreciprocal semiinfinite slabs, including a reflexion matrix with four coefficients that mixes optical polarizations. This Green’s tensor does not obey Lorentz’s reciprocity and thus violates timereversal symmetry. The general result for the Casimir force is analyzed in the retarded and nonretarded limits, concentrating on the influences arising from reflections with or without change of polarization. In a second step, we apply our general result to a photonic topological insulator whose nonreciprocity stems from an anisotropic permittivity tensor, namely InSb. We show that there is a regime for the distance between the slabs where the magnitude of the Casimir force is tunable by an external magnetic field. Furthermore, the strength of this tuning depends on the orientation of the magnetic field with respect to the slab surfaces.



Giant Interatomic EnergyTransport Amplification with Nonreciprocal Photonic Topological Insulators
Auteur(s): Doyeux P., Hassani gangaraj S. ali, Hanson George w., Antezza M.
(Article) Publié:
Physical Review Letters, vol. 119 p.173901 (2017)
Ref HAL: hal01624891_v1
DOI: 10.1103/PhysRevLett.119.173901
Exporter : BibTex  endNote
Résumé: We show that the energytransport efficiency in a chain of twolevel emitters can be drastically enhanced by the presence of a photonic topological insulator (PTI). This is obtained by exploiting the peculiar properties of its nonreciprocal surface plasmon polariton (SPP), which is unidirectional, and immune to backscattering, and propagates in the bulk band gap. This amplification of transport efficiency can be as much as 2 orders of magnitude with respect to reciprocal SPPs. Moreover, we demonstrate that despite the presence of considerable imperfections at the interface of the PTI, the efficiency of the SPPassisted energy transport is almost unaffected by discontinuities. We also show that the SPP properties allow energy transport over considerably much larger distances than in the reciprocal case, and we point out aparticularly simple way to tune the transport. Finally, we analyze the specific case of a twoemitter chain and unveil the origin of the efficiency amplification. The efficiency amplification and the practical advantages highlighted in this work might be particularly useful in the development of new devices intended to manage energy at the atomic scale.



Radiative heattransfer between metallic gratings using adaptive spatial resolution
Auteur(s): Messina R., Noto A., Guizal B., Antezza M.
Conférence invité: META'17  Incheon – Korea (Incheon  Seoul, KR, 20170725)
Ref HAL: hal01570566_v1
Exporter : BibTex  endNote
Résumé: We calculate the radiative heat transfer between two metallic gratings by exploiting the Adaptive Spatial Resolution metod. This technique dramatically improves the rate of convergence allowing to explore smaller separations. The heat flux shows a remarkable amplification of the exchanged energy, due to spoofplasmon modes. We find a consistent disagreement with some previously obtained results going up to 50% (this disagreement is explained in terms of an incorrect connection between the reflection operators of the two gratings).



Graphenebased amplification and tuning of nearfield radiative heat transfer between dissimilar polar materials
Auteur(s): Messina R., BenAbdallah Philippe, Guizal B., Antezza M.
(Article) Publié:
Physical Review B, vol. 96 p.045402 (2017)
Ref HAL: hal01557223_v1
DOI: 10.1103/PhysRevB.96.045402
Exporter : BibTex  endNote
Résumé: The radiative heat transfer between two dielectrics can be strongly enhanced in the near field in the presence of surface phononpolariton resonances. Nevertheless, the spectral mismatch between the surface modes supported by two dissimilar materials is responsible for a dramatic reduction of the radiative heat flux they exchange. In the present paper we study how the presence of a graphene sheet, deposited on the material supporting the surfacewave of lowest frequency, allows us to widely tune the radiative heat transfer, producing an amplification factor going up to one order of magnitude. By analyzing the Landauer energy transmission coefficients we demonstratethat this amplification results from the interplay between the delocalized plasmon supported by graphene and the surface polaritons of the two dielectrics. We finally show that the effect we highlight is robust with respect to the frequency mismatch, paving the way to an active tuning and amplification of nearfield radiative heat transfer in different configurations.
