Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
The scaling behavior of the so-called boson peak in glass-formers and its relation to the elastic properties of the system remains a source of controversy. Here the boson peak in a binary reactive mixture is measured by Raman scattering (i) on cooling the unreacted mixture well below its glass-transition temperature and (ii) after quenching to very low temperature the mixture at different times during isothermal polymerization. We find that the scaling behavior of the boson peak with the properties of the elastic medium - as measured by the Debye frequency - holds for states in which the elastic moduli follow a generalized Cauchy-like relationship, and breaks down in coincidence with the departure from this relation. A possible explanation is given in terms of the development of long-range stresses in glasses. The present study provides new insight into the boson peak behavior and is able to reconcile the apparently conflicting results presented in literature.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/jp4054742 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Efficient Upconverted Exciton-Polariton Lasing via Three-Photon Absorption in Colloidal Quantum Wells.
Nano Lett
August 2025
School of Information Science and Engineering, Key Laboratory of Laser & Infrared System (Shandong University), Ministry of Education, Shandong University, Qingdao 266237, China.
Achieving low-threshold lasing under multiphoton excitation is challenging due to weak nonlinear absorption and the requirement for population inversion. We address this by employing colloidal quantum wells (CQWs). They exhibit large three-photon absorption (3PA) cross sections, strong optical gain, and robust excitonic properties, enabling exciton-photon strong coupling and inversion-free polariton lasing.
View Article and Find Full Text PDFSpin conductivity in two-dimensional Heisenberg model on Lieb lattice under magnetic field and spin-orbit interactions.
Sci Rep
July 2025
Department of Physics, Razi University, Kermanshah, Iran.
We investigate here the impact of an out-of-plane magnetic field and spin-orbit interaction on the spin conductivity of the two-dimensional Heisenberg model on a Lieb lattice. In this study, the Hamiltonian of the spin model has been transformed into a strongly interacting bosonic gas using a hard boson transformation. In this transformation, the occupation of a boson at each site is restricted by adding a hard core repulsion.
View Article and Find Full Text PDFStructural origins of ultralow glass-like thermal conductivity in AgGaGeSe.
Sci Adv
June 2025
Center for Integrated Materials Research, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus, Denmark.
Materials with low thermal conductivity are important for a variety of applications such as thermal barrier coatings and thermoelectrics, and understanding the underlying mechanisms of low heat transport, as well as relating them to structural features, remains a central goal within material science. Here, we report on the ultralow thermal conductivity of the quarternary crystalline silver chalcogenide AgGaGeSe, with a remarkable value of only 0.2 watts per meter per kelvin at room temperature and an unusual glass-like thermal behavior from 2 to 700 kelvin.
View Article and Find Full Text PDFQuartic Scaling of Sound Attenuation with Frequency in Vitreous Silica.
Phys Rev Lett
May 2025
Université de Montpellier, Laboratoire Charles Coulomb, CNRS, F-34095 Montpellier, France.
Many theories predict a quartic increase of the acoustic damping at sub-THz frequencies in glassy media, related to the excess vibrational modes known as the boson peak anomaly. Here by introducing phase-sensitive acoustic spectroscopy techniques with a THz bandwidth, we investigate the acoustic properties of vitreous silica at 15 and 300 K in the crucial but unexplored sub-THz gap region below the boson peak. Our results indicate a negative dispersion below the THz range and the onset of an athermal quartic frequency scaling acoustic attenuation term, which appears above all other thermal losses.
View Article and Find Full Text PDFPhonon Localization and a Boson-Peak-Like Anomaly in Twisted Penta-PdSe Bilayer.
Nano Lett
May 2025
Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States.
With the emergence of twistronics, twisting has been employed to manipulate phonon-phonon interactions in 2D-layered systems. However, due to the complexity of twisted structures, twisting-induced phonon localization and Boson-peak-like (BP-like) anomalies have not yet been reported. In this work, using machine-learning-supported molecular dynamics, we study the impact of interlayer twisting on the phonon properties in bilayer pentagonal PdSe (penta-PdSe) with multiple twist angles.
View Article and Find Full Text PDF