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Production scientifique
Théorie des Champs & Physique Mathématique
(21) Production(s) de l'année 2016
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The multipolar hamiltonian to model quantum metamaterialsin the visible range
Auteur(s): Rousseau E., Felbacq D.
Conférence invité: Quantum Metamaterials and Quantum Technology 2016 workshop (Spetses, GR, 2016-06-19)
Texte intégral en Openaccess :
Ref HAL: hal-01337693_v1
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Résumé: This presentation adresses the question of the correct hamiltonian to describe a quantum metamaterials in the optical frequency range.
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Enhancing carbon-nanotubes luminescence with the help of resonant hotspots
Auteur(s): Rousseau E., Beaufils C., Cassabois G.
Conférence invité: Advances in Photonics and Applications (Florence, IT, 2016-06-09)
Texte intégral en Openaccess :
Ref HAL: hal-01333418_v1
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Résumé: In this talk we will present experimental results demonstrating enhancement of the luminescence of single carbon nanotubes with the help of a random surface of resonant metallic scatterers.
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Quantum metamaterials in the microwave and optical ranges
Auteur(s): Zagoskin A. m., Felbacq D., Rousseau E.
(Article) Publié:
Epj Quantum Technology, vol. 3 p.2 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01333403_v1
Ref Arxiv: 1601.06587
DOI: 10.1140/epjqt/s40507-016-0040-x
WoS: 000407193100001
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
22 Citations
Résumé: Quantum metamaterials generalize the concept of metamaterials (artificial optical media) to the case when their optical properties are determined by the interplay of quantum effects in the constituent 'artificial atoms' with the electromagnetic field modes in the system. The theoretical investigation of these structures demonstrated that a number of new effects (such as quantum birefringence, strongly nonclassical states of light, etc) are to be expected, prompting the efforts on their fabrication and experimental investigation. Here we provide a summary of the principal features of quantum metamaterials and review the current state of research in this quickly developing field, which bridges quantum optics, quantum condensed matter theory and quantum information processing.
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D-instantons, mock modular forms and BPS partition functions
Auteur(s): Alexandrov S.
Conférence invité: Number Theory and Physics (Paris, FR, 2016-05-23)
Ref HAL: hal-01330956_v1
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Résumé: I'll discuss the modular properties of D3-brane instantons appearing in Calabi-Yau string compactifications. I'll show that the D3-instanton contribution to a certain geometric potential on the hypermultiplet moduli space can be related to the elliptic genus of (0,4) SCFT. The modular properties of the potential imply that the elliptic genus associated with non-primitive divisors of Calabi-Yau is only mock modular. I'll show how to construct its modular completion and prove the modular invariance of the twistorial construction of D-instanton corrected hypermultiplet moduli space.
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Quark Condensate from Renormalization Group Optimized Spectral Density
Auteur(s): Kneur J.-L., Neveu A.
(Article) Publié:
Nuclear Physics B - Proceedings Supplements, vol. 270 p.98-102 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01264155_v1
Ref Arxiv: 1512.03406
DOI: 10.1016/j.nuclphysbps.2016.02.021
WoS: WOS:000375626800021
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: Our renormalization group consistent variant of optimized perturbation, RGOPT, is used to calculate the nonperturbative QCD spectral density of the Dirac operator and the related chiral quark condensate $\langle \bar q q \rangle$, for $n_f=2$ and $n_f=3$ massless quarks. Sequences of approximations at two-, three-, and four-loop orders are very stable and give $\langle \bar q q \rangle^{1/3}_{n_f=2}(2\, {\rm GeV}) = -(0.833-0.845) \bar\Lambda_2 $, and $ \langle \bar q q \rangle^{1/3}_{n_f=3}(2\, {\rm GeV}) = -(0.814-0.838) \bar\Lambda_3 $ where the range is our estimated theoretical error and $\bar\Lambda_{n_f}$ the basic QCD scale in the $\rm \bar{MS}$-scheme. We compare those results with other recent determinations (from lattice calculations and spectral sum rules).
Commentaires: 5 pages, talk given at 18th International Conference in Quantum Chromodynamics (QCD 15) Montpellier, published in the proceedings
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Generalized Zeta function representation of groups and 2-dimensional Topological Yang-Mills theory: The example of GL(2, F_q) and PGL(2, F_q)
Auteur(s): Roche P.
(Article) Publié:
Journal Of Mathematical Physics, vol. 57 p.Article number 031701 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01250756_v1
Ref Arxiv: 1512.03811
DOI: 10.1063/1.4943294
WoS: 000374013800005
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We recall the relation between Zeta function representation of groups and two-dimensional topological Yang-Mills theory through Mednikh formula. We prove various generalisations of Mednikh formulas and define generalization of Zeta functions representations of groups. We compute some of these functions in the case of the finite group $GL(2, {\mathbb F}_q)$ and $PGL(2,{\mathbb F}_q).$ We recall the table characters of these groups for any $q$, compute the Frobenius-Schur indicator of their irreducible representations and give the explicit structure of their fusion rings
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Measuring enhanced optical correlations induced by transmission open channels in a slab geometry
Auteur(s): Verrier N., Depreater L, Felbacq D., Gross M.
(Article) Publié:
Physical Review B, vol. 93 p.161114 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01181347_v2
Ref Arxiv: 1507.08399
DOI: 10.1103/PhysRevB.93.161114
WoS: WOS:000374952800001
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
5 Citations
Résumé: Due to the existence of open channels, light could theoretically be transmitted through disorderedmedia with 100% efficiency. However, because of the large number of channels to be controlledor measured, this has been never observed experimentally. To avoid this difficulty we considerobservables easier to handle experimentally. By measuring the correlations of the field transmittedthrough a disordered medium, we were able to count the number of channels involved in transmissionand to compare this number with theory. For a sample of transmission 1=25, we get a number ofmodes about 15 times smaller than for free space propagation. This figure is in good agreementwith theoretical prediction.
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