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Théorie du rayonnement matière et phénomènes quantiques
(21) Production(s) de l'année 2023
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Effect of graphene grating coating on near-field radiative heat transfer
Auteur(s): Luo M., Jeyar Y., Guizal B., Zhao Junming, Antezza M.
(Article) Publié:
Applied Physics Letters, vol. 123 p.253902 (2023)
DOI: 10.1063/5.0182725
Résumé: In this work, we analyze the near-field radiative heat transfer (NFRHT) between finite-thickness planar fused silica slabs coated with graphene gratings. We go beyond the effective medium approximation by using an exact Fourier modal method equipped with specific local basis functions, and this is needed for realistic experimental analysis. In general, coating a substrate with a full graphene sheet has been shown to decrease the NFRHT at short separations (typically for d < 100 nm) compared to the bare substrates, where the effective medium approximation consistently overestimates the radiative heat flux, with relative errors exceeding 50%. We show that by patterning the graphene sheet into a grating, the topology of the plasmonic graphene mode changes from circular to hyperbolic, allowing to open more channels for the energy transfer between the substrates. We show that at short separations, the NFRHT between slabs coated with graphene gratings is higher than that between full-graphene-sheet coated slabs and also than that between uncoated ones. We also exhibit a significant dependence of the radiative heat transfer on the chemical potential, which can be applied to modulate in situ the scattering properties of the graphene grating without any geometric alterations. Additionally, we compare the exact calculation with an approximate additive one and confirm that this approximation performs quite well for low chemical potentials. This work has the potential to unveil new avenues for harnessing non-additive heat transfer effects in graphene-based nanodevices.
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Nonreciprocal heat flux via synthetic fields in linear quantum systems
Auteur(s): Biehs Svend-age, Rodriguez-lopez Pablo, Antezza M., Agarwal Girish
(Article) Publié:
Physical Review A, vol. 108 p.042201 (2023)
DOI: 10.1103/PhysRevA.108.042201
Résumé: We study the heat transfer between
N
coupled quantum resonators with applied synthetic electric and magnetic fields realized by changing the resonator parameters by external drivings. To this end we develop two general methods, based on the quantum optical master equation and on the Langevin equation for
N
coupled oscillators where all quantum oscillators can have their own heat baths. The synthetic electric and magnetic fields are generated by a dynamical modulation of the oscillator resonance with a given phase. Using Floquet theory, we solve the dynamical equations with both methods, which allow us to determine the heat flux spectra and the transferred power. We apply these methods to study the specific case of a linear tight-binding chain of four quantum coupled resonators. We find that, in that case, in addition to a nonreciprocal heat flux spectrum already predicted in previous investigations, the synthetic fields induce here nonreciprocity in the total heat flux, hence realizing a net heat flux rectification.
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Spontaneous Symmetry Breaking and Time-Crystal States in Chiral Atomic Systems
Auteur(s): Silveirinha Mario G, Terças Hugo, Antezza M.
(Article) Publié:
Physical Review B, vol. 108 p.235154 (2023)
Texte intégral en Openaccess :
Ref HAL: hal-04196317_v1
Ref Arxiv: 2308.09559
Ref INSPIRE: 2689469
DOI: 10.1103/PhysRevB.108.235154
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We present a theoretical study of the interaction between an atom characterized by a degenerate ground state and a reciprocal environment, such as a semiconductor nanoparticle, without the presence of external bias. Our analysis reveals that the combined influence of the electron's intrinsic spin magnetic moment on the environment and the chiral atomic dipolar transitions may lead to either the spontaneous breaking of time-reversal symmetry or the emergence of time-crystal-like states with remarkably long relaxation times. The different behavior is ruled by the handedness of the precession motion of the atom's spin vector, which is induced by virtual chiral-dipolar transitions. Specifically, when the relative orientation of the precession angular velocity and the electron spin vector is as in a spinning top, the system manifests time-crystal-like states. Conversely, with the opposite relative orientation, the system experiences spontaneous symmetry breaking of time-reversal symmetry. Our findings introduce a novel mechanism for the spontaneous breaking of time-reversal symmetry in atomic systems, and unveil an exciting opportunity to engineer a nonreciprocal response at the nanoscale, exclusively driven by the quantum vacuum fluctuations.
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Multiple magnetoplasmon polaritons of magneto-optical graphene in near-field radiative heat transfer
Auteur(s): Mingjian He, Qu Lei, Ren Ya-tao, Qi Hong, Antezza M., Tan He-ping
(Article) Publié:
Materials Today Physics, vol. 37 p.101207 (2023)
DOI: 10.1016/j.mtphys.2023.101207
Résumé: Graphene, as a two-dimensional magneto-optical material, supports magnetoplasmon polaritons (MPP) when exposed to an applied magnetic field. Recently, MPP of a single-layer graphene has shown an excellent capability in the modulation of near-field radiative heat transfer (NFRHT). In this study, we present a comprehensive theoretical analysis of NFRHT between two multilayered graphene structures, with a particular focus on the multiple MPP effect. We reveal the physical mechanism and evolution law of the multiple MPP, and we demonstrate that the multiple MPP allow one to mediate, enhance, and tune the NFRHT by appropriately engineering the properties of graphene, the number of graphene sheets, the intensity of magnetic fields, as well as the geometric structure of systems. We show that the multiple MPP have a quite significant distinction relative to the single MPP or multiple surface plasmon polaritons (SPPs) in terms of modulating and manipulating NFRHT. We demonstrate that this remarkable behavior is attributed to the coupling between the significant contributions of surface states at multiple surfaces and Shubnikov–de Haas-like oscillations in the spectrum, indicating a transformation of intraband and interband transitions. Notably, we find that the evolution from single MPP to multiple MPP is absolutely different from that from single SPPs to multiple SPPs. Finally, a thermal magnetoresistance effect and a negative-positive transition of the relative thermal magnetoresistance ratio are predicted in the multilayered system under consideration. Our study paves the way for a flexible control of NFRHT and it offers the possibility for the thermal photon-based communication technology and a magnetically controllable thermal switch.
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Performance improvement of three-body radiative diodes driven by graphene surface plasmon polaritons
Auteur(s): Mingjing Li, Xue Guo, Qi Hong, Zheng Zhi-heng, Antezza M., Tan He-ping
(Article) Publié:
Physical Chemistry Chemical Physics, vol. 25 p.20782 (2023)
DOI: 10.1039/d3cp01912h
Résumé: As an analogue to an electrical diode, a radiative thermal diode allows radiation to transfer more efficiently in one direction than in the opposite direction by operating in a contactless mode. In this study, we demonstrated that within the framework of three-body photon thermal tunneling, the rectification performance of a three-body radiative diode can be greatly improved by bringing graphene into the system. The system is composed of three parallel slabs, with the hot and cold terminals of the diode coated with graphene films and the intermediate body made of vanadium dioxide (VO2). The rectification factor of the proposed radiative thermal diode reaches 300% with a 350 nm separation distance between the hot and cold terminals of the diode. With the help of graphene, the rectification performance of the radiative thermal diode can be improved by over 11 times. By analyzing the spectral heat flux and energy transmission coefficients, it was found that the improved performance is primarily attributed to the surface plasmon polaritons (SPPs) of graphene. They excite the modes of insulating VO2 in the forward-biased scenario by forming strongly coupled modes between graphene and VO2 and thus dramatically enhance the heat flux. However, for the reverse-biased scenario, the VO2 is at its metallic state, and thus, graphene SPPs cannot work by three-body photon thermal tunneling. Furthermore, the improvement was also investigated for different chemical potentials of graphene and geometric parameters of the three-body system. Our findings demonstrate the feasibility of using thermal-photon-based logical circuits, creating radiation-based communication technology and implementing thermal management approaches at the nanoscale.
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Confinement-Induced Nonlocality and Casimir Force in Transdimensional Systems
Auteur(s): Bondarev Igor V, Pugh Michael D, Rodriguez-Lopez Pablo, Woods Lilia M, Antezza M.
(Article) Publié:
-Phys.chem.chem.phys., vol. 25 p.29257-29265 (2023)
Texte intégral en Openaccess :
Ref HAL: hal-04174566_v1
Ref Arxiv: 2307.06452
Ref INSPIRE: 2676657
DOI: 10.1039/D3CP03706A
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We study within the framework of the Lifshitz theory the long-range Casimir force for in-plane isotropic and anisotropic free-standing transdimensional material slabs. In the former case, we show that the confinement-induced nonlocality not only weakens the attraction of ultrathin slabs but also changes the distance dependence of the material-dependent correction to the Casimir force to go as $\sim\!1/\!\sqrt{l}$ contrary to the $\sim\!1/l$ dependence of that of the local Lifshitz force. In the latter case, we use closely packed array of parallel aligned single-wall carbon nanotubes in a dielectric layer of finite thickness to demonstrate strong orientational anisotropy and crossover behavior for the inter-slab attractive force in addition to its reduction with decreasing slab thickness. We give physical insight as to why such a pair of ultrathin slabs prefers to stick together in the perpendicularly oriented manner, rather than in the parallel relative orientation as one would customarily expect.
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Modeling the Excitation of Graphene Magneto-plasmons in Periodic Grating of Magnetostatic Biased Graphene Ribbons
Auteur(s): Benrhouma Maha, Edee Kofi, Guizal B.
Conference: PhotonIcs & Electromagnetics Research Symposium (PIERS) (prague, CZ, 2023-07-03)
Ref HAL: hal-04172452_v1
Exporter : BibTex | endNote
Résumé: We present an accurate and simple semi analytical model for studying the magneto- plasmonic response of a 1D subwavelength graphene strip grating under an external static mag- netic field. In this model, the graphene sheet is considered as an anisotropic layer with atomic thickness. Under these conditions and in contrast to the previous works, an effective medium approach (EMA) is applied to the graphene permittivity tensor and a rigorous phase correction is required to take into account the periodicity effect. The resonance phenomena occurring into the structure are taken into account in the model using the scattering matrix approach. The re- flection and transmission spectra of the structure are then given as the sum of two contributions, the scattering contribution and the single strip contribution. In order to numerically validate and evaluate the proposed model, the results have been compared with those obtained from the PMM [1, 2] method and from methods published in the literature [3, 4]. This simple approach is useful to better understand graphene surface magnetoplasmons GSMPs and may facilitate the design of various tunable devices based on graphene magnetoplasmonics.
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