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Superdiffusive Thermal Transport in Polymer-Grafted Nanoparticle Melts.
Phys Rev Lett
December 2024
Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, Tongji University, Shanghai 20092, China.
In contrast to normal diffusion processes, thermal conduction in one-dimensional systems is anomalous. The thermal conductivity is found to vary with the length as κ∼L^{α}(α>0), but there is a long-standing debate on the value α. Here, we present a canonical example of this behavior in polymer-grafted spherical nanoparticle (GNP) melts at fixed grafting density and nanoparticle radius.
View Article and Find Full Text PDFElectride transition in liquid aluminum under high pressure and high temperature.
J Chem Phys
January 2025
Key Laboratory of Efficient Low-carbon Energy Conversion and Utilization of Jiangsu Provincial Higher Education Institutions, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China.
Despite the conventional view of liquid aluminum (l-Al) as a simple metal governed by the free-electron model, it exhibits unique bonding characteristics. This study uncovers a gradual transition from free electron to electride behavior in l-Al at high pressure and temperature, forming a type of two-component liquid where atomic and electride states coexist. The proportion of electride increases with pressure and temperature until reaching saturation, leading to notable changes in the pair-correlation function and coordination number of l-Al at saturation pressure.
View Article and Find Full Text PDFCritical Nematic Phase with Pseudogaplike Behavior in Twisted Bilayers.
Phys Rev Lett
December 2024
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
The crystallographic restriction theorem constrains two-dimensional nematicity to display either Ising (Z_{2}) or three-state-Potts (Z_{3}) critical behaviors, both of which are dominated by amplitude fluctuations. Here, we use group theory and microscopic modeling to show that this constraint is circumvented in a 30°-twisted hexagonal bilayer due to its emergent quasicrystalline symmetries. We find a critical phase dominated by phase fluctuations of a Z_{6} nematic order parameter and bounded by two Berezinskii-Kosterlitz-Thouless (BKT) transitions, which displays only quasi-long-range nematic order.
View Article and Find Full Text PDFSpintronic devices and applications using noncollinear chiral antiferromagnets.
Nanoscale Horiz
December 2024
Electrical and Computer Engineering, The Grainger College of Engineering, University of Illinois Urbana-Champaign, Urbana, USA.
Antiferromagnetic materials have several unique properties, such as a vanishingly small net magnetization, which generates weak dipolar fields and makes them robust against perturbation from external magnetic fields and rapid magnetization dynamics, as dictated by the geometric mean of their exchange and anisotropy energies. However, experimental and theoretical techniques to detect and manipulate the antiferromagnetic order in a fully electrical manner must be developed to enable advanced spintronic devices with antiferromagnets as their active spin-dependent elements. Among the various antiferromagnetic materials, conducting antiferromagnets offer high electrical and thermal conductivities and strong electron-spin-phonon interactions.
View Article and Find Full Text PDFCurrent insights and challenges in the management of perifoveal vascular anomalous complex (PVAC): a systematic review of multimodal imaging features and treatment strategies.
Eye (Lond)
December 2024
IRCCS Ospedale Policlinico San Martino, Eye Unit, Genova, Italy.
The aim of this article is to comprehensively review the multimodal imaging (MMI) features that define perifoveal vascular anomalous complex (PVAC) and to update the optimal treatment strategies for this disorder with a focus also on the underlying pathogenetic mechanisms. This systematic review was performed based on a search of the PubMed and Embase databases of relevant papers on the subject of PVAC. PVAC is characterized by well-defined MMI findings, including remarkable morphological features with optical coherence tomography (OCT) and OCT angiography (OCTA).
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