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Search Results (4)

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Keywords = Rabi lattices

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8 pages, 2763 KiB  
Article
High Electric Field Enhancement Induced by Modal Coupling for a Plasmonic Dimer Array on a Metallic Film
by Jiawei Liu, Ziming Meng and Jinyun Zhou
Photonics 2024, 11(2), 183; https://doi.org/10.3390/photonics11020183 - 17 Feb 2024
Cited by 1 | Viewed by 1656
Abstract
A giant electric field on a subwavelength scale is highly beneficial for boosting the light–matter interaction. In this paper, we investigated a hybrid structure consisting of a hemispheric dimer array and a gold film and realized resonant mode coupling of the surface lattice [...] Read more.
A giant electric field on a subwavelength scale is highly beneficial for boosting the light–matter interaction. In this paper, we investigated a hybrid structure consisting of a hemispheric dimer array and a gold film and realized resonant mode coupling of the surface lattice resonance (SLR) and surface plasmon polariton (SPP). Mode coupling is demonstrated by observing anti-crossing in reflection spectra, which corresponds to Rabi splitting. Although the resonance coupling does not enter the strong coupling regime, an improved quality factor (Q~350) and stronger electric field enhancement in the gap region of the dimer (i.e., hot spot) in our hybrid structure are obtained compared to those of the single dimer or dimer array only. Remarkably, the magnitude of electric field enhancement over 500 can be accessible. Such high field enhancement makes our hybridized structure a versatile platform for the realization of ultra-sensitive biosensing, low-threshold nanolasing, low-power nonlinear optical devices, etc. Full article
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8 pages, 1884 KiB  
Article
Experimental Observation of the Suppression of the Dephasing in a Floquet Engineering Optical Lattice Clock
by Feng Guo, Xiaotong Lu, Chihua Zhou and Hong Chang
Appl. Sci. 2022, 12(22), 11618; https://doi.org/10.3390/app122211618 - 16 Nov 2022
Viewed by 1705
Abstract
Accurately manipulating quantum states is a fundamental strategy for improving the performance of quantum metrology, computing, and simulation. However, the quantum state is susceptible to dephasing due to the temperature and density of the atomic ensembles. In this paper, we experimentally study the [...] Read more.
Accurately manipulating quantum states is a fundamental strategy for improving the performance of quantum metrology, computing, and simulation. However, the quantum state is susceptible to dephasing due to the temperature and density of the atomic ensembles. In this paper, we experimentally study the effect of Floquet engineering (FE) on the dephasing process in an 87Sr optical clock. By measuring the Rabi flopping process under different temperatures of the cold ensemble and numbers of atoms trapped in the lattice, our results show that the FE can suppress the dephasing due to high temperatures or a large number of atoms. Indeed, when the temperature and the number of atoms are 3.8 μK and 6300, respectively, the FE can obviously suppress the dephasing effect and improve the maximum excitation fraction of the Rabi spectrum by 15.4%. Full article
(This article belongs to the Section Optics and Lasers)
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35 pages, 1105 KiB  
Article
Generalized Master Equation Approach to Time-Dependent Many-Body Transport
by Valeriu Moldoveanu, Andrei Manolescu and Vidar Gudmundsson
Entropy 2019, 21(8), 731; https://doi.org/10.3390/e21080731 - 25 Jul 2019
Cited by 9 | Viewed by 4734
Abstract
We recall theoretical studies on transient transport through interacting mesoscopic systems. It is shown that a generalized master equation (GME) written and solved in terms of many-body states provides the suitable formal framework to capture both the effects of the Coulomb interaction and [...] Read more.
We recall theoretical studies on transient transport through interacting mesoscopic systems. It is shown that a generalized master equation (GME) written and solved in terms of many-body states provides the suitable formal framework to capture both the effects of the Coulomb interaction and electron–photon coupling due to a surrounding single-mode cavity. We outline the derivation of this equation within the Nakajima–Zwanzig formalism and point out technical problems related to its numerical implementation for more realistic systems which can neither be described by non-interacting two-level models nor by a steady-state Markov–Lindblad equation. We first solve the GME for a lattice model and discuss the dynamics of many-body states in a two-dimensional nanowire, the dynamical onset of the current-current correlations in electrostatically coupled parallel quantum dots and transient thermoelectric properties. Secondly, we rely on a continuous model to get the Rabi oscillations of the photocurrent through a double-dot etched in a nanowire and embedded in a quantum cavity. A many-body Markovian version of the GME for cavity-coupled systems is also presented. Full article
(This article belongs to the Special Issue Quantum Transport in Mesoscopic Systems)
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10 pages, 1583 KiB  
Article
Zigzag Solitons and Spontaneous Symmetry Breaking in Discrete Rabi Lattices with Long-Range Hopping
by Haitao Xu, Zhelang Pan, Zhihuan Luo, Yan Liu, Suiyan Tan, Zhijie Mai and Jun Xu
Symmetry 2018, 10(7), 277; https://doi.org/10.3390/sym10070277 - 12 Jul 2018
Viewed by 3628
Abstract
A new type of discrete soliton, which we call zigzag solitons, is founded in two-component discrete Rabi lattices with long-range hopping. The spontaneous symmetry breaking (SSB) of zigzag solitons is also studied. Through numerical simulation, we found that by enhancing the intensity of [...] Read more.
A new type of discrete soliton, which we call zigzag solitons, is founded in two-component discrete Rabi lattices with long-range hopping. The spontaneous symmetry breaking (SSB) of zigzag solitons is also studied. Through numerical simulation, we found that by enhancing the intensity of the long-range linearly-coupled effect or increasing the total input power, the SSB process from the symmetric soliton to the asymmetric soliton will switch from the supercritical to subcritical type. These results can help us better understand both the discrete solitons and the Rabi coupled effect. Full article
(This article belongs to the Special Issue Optical Waveguides in Photonic Crystals)
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