Super-radiant dynamics, doorways and resonances in nuclei and other open mesoscopic systems

Auerbach, N.; Zelevinsky, Vladimir

doi:10.1088/0034-4885/74/10/106301

Cited by 114 publications

(173 citation statements)

References 286 publications

(578 reference statements)

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“…So, the decay width of one (superradiant) eigenstate continue to grow with Γ4, and the decay widths of all other (subradient) eigenstates decreases. This segregation behavior of the decay widths is one of the characteristic properties of the ST [7,10]. As one can see from Overlapping of resonances.…”

Section: Results Of Numerical Simulationsmentioning

confidence: 79%

“…Indeed, at this point the spacing between these two states (resonances) is approximately equal to the half-sum of their decay widths: E blue − E red ≈ Υ blue − Υ red . Then, these resonances cannot be considered to be isolated, and they both coherently contribute to the ET to the corresponding sink (continuum) [7,10]. In our case, only two resonances overlap at Γ * 4 .…”

Section: Results Of Numerical Simulationsmentioning

confidence: 86%

“…The bi-orthogonal eigenstates of the effective non-Hermitian Hamiltonian,H, provide a convenient basis in which the eigenvalue problem can be formulated and resolved [7,10]. (See also references therein.)…”

Section: Mathematical Formulation Of the Modelmentioning

confidence: 99%

“…For those sites which are not connected to sinks, the corresponding ET rates vanish. Under reasonable assumptions, this type of model can be described by an effective non-Hermitian Hamiltonian [2,3,4,5,6].Then, this approach becomes similar to those used in describing the so-called "superradiance transition" (ST) in systems in which the discrete (intrinsic) energy states interact with the continuum spectra [7,8,9,10,11,12]. In these systems, the ST usually occurs when the resonances start to overlap.…”

mentioning

confidence: 99%

“…Then, this approach becomes similar to those used in describing the so-called "superradiance transition" (ST) in systems in which the discrete (intrinsic) energy states interact with the continuum spectra [7,8,9,10,11,12]. In these systems, the ST usually occurs when the resonances start to overlap.…”

mentioning

confidence: 99%

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Superradiance Transition and Nonphotochemical Quenching in Photosynthetic Complexes

et al. 2015

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We demonstrate numerically that superradiance could play a significant role in nonphotochemical quenching (NPQ) in light-harvesting complexes. Our model consists of a network of five interconnected sites (discrete excitonic states) that are responsible for the NPQ mechanism. Damaging and charge transfer states are linked to their sinks (independent continuum electron spectra), in which the chemical reactions occur. The superradiance transition in the charge transfer (or in the damaging) channel, occurs at particular electron transfer rates from the discrete to the continuum electron spectra, and can be characterized by a segregation of the imaginary parts of the eigenvalues of the effective non-Hermitian Hamiltonian. All five excitonic sites interact with their protein environment that is modeled by a random stochastic process. We find the region of parameters in which the superradiance transition into the charge transfer channel takes place. We demonstrate that this superradiance transition has the capability of producing optimal NPQ performance. W hen sunlight intensity is too high, damaging processes (such as singlet oxygen production) occur, that can destroy the photosynthetic organisms. To survive intense sunlight fluctuations, photosynthetic organisms have evolved many protective strategies, including nonphotochemical quenching (NPQ) [1]. (See also references therein.) Using this strategy, light-harvesting complexes (LHCs) experience geometrical reorganizations due to the conformational changes of their protein environments. As a result, the damaging channels are partly suppressed, and the excessive sunlight energy is transfered to the non-damaging, quenching channel(s), that are opened in this regime.In modeling the NPQ mechanisms, it is possible to characterize the sites of the LHCs by the discrete excitonic energy states, |n , n being the number of site, associated with the light-sensitive chlorophyll or carotenoid molecule. Then, both the damaging and undamaging channels can be characterized by their corresponding sinks, |Sn , that provide independent continuum electron energy spectra [2]. These sinks can have very complex structures, and they can be responsible for primary charge separation processes, as in the photosynthetic reaction centers (RCs) [3,4], for creation of charge transfer states, for singlet oxygen production [2], and for many other quasi-reversible chemical reactions. Generally, a particular sink, |Sn , is connected to a particular site, |n . The energy transfer from this state to its sink is characterized by the electron transfer (ET) rate, Γn. For those sites which are not connected to sinks, the corresponding ET rates vanish. Under reasonable assumptions, this type of model can be described by an effective non-Hermitian Hamiltonian [2,3,4,5,6].Then, this approach becomes similar to those used in describing the so-called "superradiance transition" (ST) in systems in which the discrete (intrinsic) energy states interact with the continuum spectra [7,8,9,10,11,12]. In these systems, th...

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Section: Results Of Numerical Simulationsmentioning

confidence: 79%

Section: Results Of Numerical Simulationsmentioning

confidence: 86%

Section: Mathematical Formulation Of the Modelmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Superradiance Transition and Nonphotochemical Quenching in Photosynthetic Complexes

et al. 2015

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Configuration Interaction Approach

2017

Physics of Atomic Nuclei

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Expanding Nuclear Physics Horizons with the Gamma Factory

et al. 2022

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The Gamma Factory (GF) is an ambitious proposal, currently explored within the CERN Physics Beyond Colliders program, for a source of photons with energies up to ≈400 MeV and photon fluxes (up to ≈1017 photons s−1) exceeding those of the currently available gamma sources by orders of magnitude. The high‐energy (secondary) photons are produced via resonant scattering of the primary laser photons by highly relativistic partially‐stripped ions circulating in the accelerator. The secondary photons are emitted in a narrow cone and the energy of the beam can be monochromatized, down to 10−3–10−6 level, via collimation, at the expense of the photon flux. This paper surveys the new opportunities that may be afforded by the GF in nuclear physics and related fields.

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Super-radiant dynamics, doorways and resonances in nuclei and other open mesoscopic systems

Cited by 114 publications

References 286 publications

Superradiance Transition and Nonphotochemical Quenching in Photosynthetic Complexes

Superradiance Transition and Nonphotochemical Quenching in Photosynthetic Complexes

Configuration Interaction Approach

Expanding Nuclear Physics Horizons with the Gamma Factory

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