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Related Concept Videos

Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

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Reentrant localization transition in a dimerized quasiperiodic dipolar chain.

Thomas François Allard1,2,3, Guillaume Weick1

  • 1Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 6, 2026
PubMed
Summary

Reentrant localization transitions were observed in a quasiperiodic system with long-range coupling and dissipation. These transitions are driven by chain dimerization and asymmetric modulation, but losses detrimentally affect them.

Keywords:
Aubry–André modeldisordered systemsquasicrystals

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Photonics

Background:

  • Reentrant localization transitions, where states shift from localized to critical and back to localized, are a recent discovery in quasiperiodic models.
  • The underlying mechanisms and behavior in systems with long-range coupling and dissipation are not well understood.

Purpose of the Study:

  • To investigate reentrant localization transitions in a dimerized quasiperiodic chain of lossy dipolar emitters with all-to-all coupling.
  • To explore the influence of long-range coupling and dissipation on these transitions.

Main Methods:

  • Theoretical modeling of a quasiperiodic chain with dimerization, all-to-all coupling, and lossy emitters.
  • Analysis of the interplay between chain dimerization and asymmetric quasiperiodic modulation.
  • Transport simulations using a driven-dissipative open quantum system approach.

Main Results:

  • Reentrant localization transitions persist in the presence of all-to-all couplings.
  • These transitions arise from the combined effects of chain dimerization and asymmetric modulation of emitter spacings.
  • Emitter losses were found to have detrimental effects on the reentrant localization transition.

Conclusions:

  • The study demonstrates the survival of reentrant localization transitions in complex quasiperiodic systems.
  • It highlights the critical roles of dimerization and asymmetric modulation in driving these phenomena.
  • The findings underscore the significant impact of dissipation on quantum localization effects.