Neurotransmitters &amp; Networks

Veenendaal, van; Marije, Tamar

doi:10.26481/dis.20170713tvv

Cited by 6 publications

(6 citation statements)

References 42 publications

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“…While the Bloch-Redfield approach has been successfully used by several groups [22][23][24][25][26][27][28] to describe excitonic dynamics in LHCs, there have also been many publications emphasizing its shortcomings 7,18,[29][30][31][32][33][34][35][36][37][38] . In this paper, we show how to apply Bloch-Redfield theory, such that (i) an underlying physical model can guarantee physically acceptable time evolution, (ii) the secular approximation does not have to be applied, (iii) if it is applied carefully it preserves the couplings between populations and coherences which lead to coherent oscillations between sites and (iv) the Bloch-Redfield equations are not less general than Lindblad equations and offer a greater variety of noise models than phenomenological Lindblad equations.…”

Section: Introductionmentioning

confidence: 99%

Bloch-Redfield equations for modeling light-harvesting complexes

Jeske

Ing

Plenio

et al. 2015

The Journal of Chemical Physics

128

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We challenge the misconception that Bloch-Redfield equations are a less powerful tool than phenomenological Lindblad equations for modeling exciton transport in photosynthetic complexes. This view predominantly originates from an indiscriminate use of the secular approximation. We provide a detailed description of how to model both coherent oscillations and several types of noise, giving explicit examples. All issues with non-positivity are overcome by a consistent straightforward physical noise model. Herein also lies the strength of the Bloch-Redfield approach because it facilitates the analysis of noise-effects by linking them back to physical parameters of the noise environment. This includes temporal and spatial correlations and the strength and type of interaction between the noise and the system of interest. Finally, we analyze a prototypical dimer system as well as a 7-site Fenna-Matthews-Olson complex in regards to spatial correlation length of the noise, noise strength, temperature, and their connection to the transfer time and transfer probability.

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Section: Introductionmentioning

confidence: 99%

Bloch-Redfield equations for modeling light-harvesting complexes

Jeske

Ing

Plenio

et al. 2015

The Journal of Chemical Physics

128

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“…Spin excitations were not distinguished in the earlier experiments, because of resolution limitations of the instrumentation used. These limitations can be overcome in today's experimental setups, as has been demonstrated by the observation of spin excitations in other 1D 19 or 2D 20,21 cuprates and iridates, 11,22,23 although RIXS measurements for the simpler Sr-based chain cuprates are still awaited. 24 The distinct form of the theoretical expression for the RIXS cross section provides a unique way to study properties of models for one-dimensional condensed matter systems.…”

Section: Introductionmentioning

confidence: 99%

Exact diagonalization results for resonant inelastic x-ray scattering spectra of one-dimensional Mott insulators

2012

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We examine the momentum-dependent excitation spectra of indirect as well as direct resonant inelastic x-ray scattering (RIXS) processes in half-filled (extended) Hubbard rings. We determine the fundamental features of the groundstate RIXS response and discuss the experimental conditions that can allow for the low-energy part of these features to be distinguished in one-dimensional copperoxide materials, focusing particularly on the different magnetic excitations occurring in indirect and direct RIXS processes. We study the dependence of spin and charge excitations on the choice of and detuning from resonance. Moreover, final state excitation weights are calculated as a function of the core-hole potential strength and lifetime. We show that these results can be used to determine material characteristics, such as the core-hole properties, from RIXS measurements.

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“…The formation of localized states within the gap (correlated states) are also clearly observed in most HTSC compounds. Recently a very detailed analysis of the doped systems and the nature of carriers has been given in papers [9], [100], [101] from a spectroscopic point of view. Charge carriers are introduced when the number of holes increases beyond one per unit cell.…”

Section: Coexistence Of Spin and Carriers Systemsmentioning

confidence: 99%

Correlation Effects in High-T_c Superconductors and Heavy Fermion Compounds

Kuzemsky¹

2017

Statistical Mechanics and the Physics of Many-Particle Model Systems

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This paper describes certain aspects of Highly Correlated Systems (HCS) such as high Tc superconductors (HTSC) and some new class of Heavy Fermion (HF) systems which have been studied reoently. The problem is discussed on how the charge and spin degrees of freedom participate in the specific character of superconductivity in the copper oxides and competition of the magnetism and Kondo screening in heavy fermions. The electronic structure and possible superconducting mechanisms of HTSC compounds are discussed. The similarity and dissimilarity with HF compounds is pointed out. It is shown that the spins and carriers in the copper oxides are coupled in a very nontrivial way in order to introduce the discussion and the comparison of the Emery model, the t-./-model and the Kondo-Heisenberg model. It concerns attempts to derive from fundamental multi-band Hamiltonian the reduced effective Hamittonians to extract and separate the relevant lowenergy physics. A short review of the arguments which seem to support the spin-polaron pairing mechanism in HTSC are presented. Many other topics like the idea of mixed valence states in oxides, the role of charge transfer (CT) excitations, phase separation, self-consistent nonperturbative technique, etc. are also discussed.

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Neurotransmitters & Networks

Cited by 6 publications

References 42 publications

Bloch-Redfield equations for modeling light-harvesting complexes

Bloch-Redfield equations for modeling light-harvesting complexes

Exact diagonalization results for resonant inelastic x-ray scattering spectra of one-dimensional Mott insulators

Correlation Effects in High-T_c Superconductors and Heavy Fermion Compounds

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Neurotransmitters & Networks

Cited by 6 publications

References 42 publications

Bloch-Redfield equations for modeling light-harvesting complexes

Bloch-Redfield equations for modeling light-harvesting complexes

Exact diagonalization results for resonant inelastic x-ray scattering spectra of one-dimensional Mott insulators

Correlation Effects in High-Tc Superconductors and Heavy Fermion Compounds

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Correlation Effects in High-T_c Superconductors and Heavy Fermion Compounds