Open system of interacting fermions: Statistical properties of cross sections and fluctuations

Celardo, G. L.; Izrailev, F. M.; Zelevinsky, V. G.; Berman, G. P.

doi:10.1103/physreve.76.031119

Cited by 42 publications

(70 citation statements)

References 51 publications

(111 reference statements)

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“…There exist wellpronounced similarities and some differences between them and nuclear Ericson fluctuations [17]. Some aspects of this interrelation were studied in our previous work [18].…”

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confidence: 99%

Internal chaos in an open quantum system: From Ericson to conductance fluctuations

Sorathia¹,

Izrailev²,

Celardo³

et al. 2009

Europhys. Lett.

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The model of an open Fermi-system is used for studying the interplay of intrinsic chaos and irreversible decay into open continuum channels. Two versions of the model are characterized by one-body chaos coming from disorder or by many-body chaos due to the inter-particle interactions. The continuum coupling is described by the effective non-Hermitian Hamiltonian. Our main interest is in specific correlations of cross sections for various channels in dependence on the coupling strength and degree of internal chaos. The results are generic and refer to common features of various mesoscopic objects including conductance fluctuations and resonance nuclear reactions.

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“…There exist wellpronounced similarities and some differences between them and nuclear Ericson fluctuations [17]. Some aspects of this interrelation were studied in our previous work [18].…”

mentioning

confidence: 99%

Internal chaos in an open quantum system: From Ericson to conductance fluctuations

Sorathia¹,

Izrailev²,

Celardo³

et al. 2009

Europhys. Lett.

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“…Many results turn out to be common for nuclear physics and condensed matter physics of disordered materials [48]. Here I limit myself with few references [49][50][51][52][53][54][55][56].…”

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confidence: 99%

Atomic Nucleus as Chaotic Quantum Many-Body System

Zelevinsky

2015

Acta Phys. Pol. A

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Quantum many-body chaos is described as a practical (theoretical, experimental, and computational) instrument in physics of mesoscopic systems of interacting particles. Using mainly nuclear physics applications, it is shown that interactions of constituents create stationary states of high complexity with respect to the nean-field basis with observable properties smoothly changing along the spectrum. Both local Gaussian orthogonal ensemble type features and the global evolution along the spectrum are used to understand the many-body physics and define thermodynamic properties of isolated mesoscopic objects. Among the examples discussed, especially interesting is a chaotic enhancement of weak perturbations illustrated by a large parity violation in neutron resonances on heavy nuclei. Artificially introduced chaotic elements are used to explore the nuclear landscape and predict phase transformations.

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“…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.…”

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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.…”

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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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Open system of interacting fermions: Statistical properties of cross sections and fluctuations

Cited by 42 publications

References 51 publications

Internal chaos in an open quantum system: From Ericson to conductance fluctuations

Internal chaos in an open quantum system: From Ericson to conductance fluctuations

Atomic Nucleus as Chaotic Quantum Many-Body System

Superradiance Transition and Nonphotochemical Quenching in Photosynthetic Complexes

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