Article
Nanoscience & Nanotechnology
Katja Diaz-Granados, Weiliang Ma, Guanyu Lu, Joseph Matson, Peining Li, Joshua D. D. Caldwell
Summary: The polar nature of calcite allows for the design of spatially and spectrally coherent thermal radiation patterns through lattice vibrations stimulated by gratings and nanostructures. Understanding the fundamental emissivity properties of the lattice vibrations is essential for optimal design control over such patterned materials. By manipulating the optic axis orientation of unpatterned calcite through crystallographic off-cut, polarization, and sample rotation, the emissivity at a given frequency can vary significantly.
Article
Physics, Particles & Fields
Bruno de S. L. Torres, Kelly Wurtz, Jose Polo-Gomez, Eduardo Martin-Martinez
Summary: We propose a framework for studying the entanglement structure of quantum field theory based on the concept of particle detectors in relativistic quantum information. This framework allows us to accurately capture entanglement between different-shaped regions of spacetime without encountering the usual UV divergences and other issues. Our results also provide insights into the efficiency limits of entanglement harvesting and offer an operational definition of entanglement between spacetime subregions in field theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Parijat Dey, Nirmalya Kajuri
Summary: This study investigates the relationship between the global/Poincare and AdS-Rindler representations in AdS(2), showing that they are related by conformal transformations. It also demonstrates the connection between global modes and AdS-Rindler modes through the Bogoliubov transformation, using boundary representations of creation and annihilation operators.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Psychology, Multidisciplinary
Mushfiqul Anwar Siraji, Shamsul Haque
Summary: This research translated and validated Rotter's Internal-External scale into Bangla and assessed its psychometric properties on a Bangladeshi adult sample. The 12-item scale showed satisfactory structural validity, concurrent validity, and reliability. The item response theory analysis further confirmed the scale's coverage of locus of control and its ability to discriminate between external and internal locus of control.
FRONTIERS IN PSYCHOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Giacomo Mazza, Adriano Amaricci, Massimo Capone
Summary: Heterostructures formed by stacking layers of two s-wave superconductors with different coupling strengths show enhanced superconducting critical temperature, with two distinct physical regimes identified based on the thickness of the larger layer.
Article
Astronomy & Astrophysics
Masanori Hanada
Summary: This paper reveals that the previous notion that the ground-state wave function delocalizes at large N and conflicts with the locality of bulk geometry is incorrect. By clarifying the meaning of matrix diagonalization in Yang-Mills theory, it opens up the possibility of characterizing bulk geometry through the color degrees of freedom in Yang-Mills theory all the way to the center of the bulk.
Article
Astronomy & Astrophysics
Erickson Tjoa, Finnian Gray
Summary: In this work, a modest holographic reconstruction method for asymptotically flat spacetime is presented. By using the two-point correlators of the boundary quantum field theory and the bulk-to-boundary correspondence, as well as constructing the metric using the Hadamard expansion of the field living in the bulk, the holographic reconstruction is achieved for non-interacting fields in generic asymptotically flat spacetime.
Article
Chemistry, Multidisciplinary
Noalle Fellah, Lamia Tahsin, Carolyn Jin Zhang, Bart Kahr, Michael D. Ward, Alexander G. Shtukenberg
Summary: Melt crystallization is an efficient method for polymorph screening, offering high driving force for crystallization with slow growth, nucleation, and transformation rates. Despite having a long history, it has been less frequently utilized for the discovery of new polymorphs compared to solution crystallization. Melt crystallization has been shown to produce more than half of the known polymorphs and often reveals new ones that are undetectable by other screening methods.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Inorganic & Nuclear
Vasilii Dubrovin, Alexey A. Popov, Stanislav M. Avdoshenko
Summary: This study provides a rational explanation of the electronic structure and magnetic properties of lanthanide single atomic magnets, filling the gap in theoretical understanding and emphasizing the need for new paradigms in understanding and interpreting these systems.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Jian-Ying Wu, Yi-Feng Hong
Summary: In this study, the mechanical stresses and multi-physical fracture in bulk high-temperature superconductors (HTS) during magnetization are systematically investigated using the phase-field cohesive zone model (PF-CZM). The effects of Lorentz electromagnetic forces and Joule heating on potential damage and fracture in bulk HTS are analyzed. Numerical results demonstrate the nucleation and propagation process of cracks under isothermal and non-isothermal conditions, as well as quantify the effects of Joule heating and cracking on electromagnetic performances. The proposed PF-CZM can be extended to optimize the fabrication and practical application of bulk HTS.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Physics, Multidisciplinary
Michael DeMarco, Xiao-Gang Wen
Summary: In this study, a bosonic U-k(1) rotor model with a Maxwell term on a three-dimensional spacetime lattice is proposed. By using a semiclassical approach, the low-energy properties of the model are shown to be equivalent to the Chern-Simons field theory. The lattice variables on each link are required to be compact, enforcing the quantization of the K matrix as a symmetric integer matrix with even diagonals. Additionally, the lattice model exhibits exact 1-symmetries, some of which are anomalous and can be probed by breaking the symmetries at the boundaries.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Peter Lowdon, Ralf-Arno Tripolt, Jan M. Pawlowski, Dirk H. Rischke
Summary: In this work, we derive a spectral representation for the shear viscosity arising from the thermal asymptotic states, eta(0), using nonperturbative constraints in local scalar quantum field theories at finite temperature. As an example, we calculate eta(0) in the phi(4) theory and establish its leading behavior in the small and large coupling regimes.
Article
Chemistry, Physical
Yifan Zhao, Cheng Qian, Vladislav Gladkikh, Feng Ding
Summary: This study used a highly-accurate machine learning force field to investigate phase transformations in carbon structures and obtained a theoretical diagram that provides guidance for experimental synthesis of various functional carbon materials.
Article
Astronomy & Astrophysics
Teresa Bautista, Aditya Bawane
Summary: This article investigates timelike Liouville theory with specific boundary conditions and derives the structure constants. The results show that these structure constants are not the analytic continuations of their spacelike counterparts.
Article
Physics, Particles & Fields
Simon Caron-Huot, Dalimil Mazac, Leonardo Rastelli, David Simmons-Duffin
Summary: The paper proves a long-standing conjecture that any CFT with a large central charge and a large gap Delta(gap) in the spectrum of higher-spin single-trace operators must be dual to a local effective field theory in AdS. The authors derive numerical bounds on bulk Wilson coefficients in terms of Delta(gap) using the conformal bootstrap, and show how AdS(4) naturally resolves the infrared divergences present in 4D flat-space bounds. The results imply the validity of twice-subtracted dispersion relations for any S-matrix arising from the flat-space limit of AdS/CFT.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Geography, Physical
A. Gonzalez-Diez, J. A. Barreda-Argueso, L. Rodriguez-Rodriguez, J. Fernandez-Lozano
Summary: This study analyzed the suitability of Fast Fourier Transform (FFT) filters in delimiting the objective location of geomorphic references in karstic landscapes. A digital database was created using high-resolution DEM and aerial images, dividing geomorphic domains into macroforms and mesoforms, and comparing the efficiency of FFT filters against other commonly referenced methods.
Article
Chemistry, Inorganic & Nuclear
Robin Turnbull, Javier Gonzalez-Platas, Fernando Rodriguez, Akun Liang, Catalin Popescu, Zhangzhen He, David Santamaria-Perez, Placida Rodriguez-Hernandez, Alfonso Munoz, Daniel Errandonea
Summary: The interplay between crystal structure and electronic structure in semiconductor materials is crucial for their potential technological applications. In this study, the high-pressure behavior of semiconducting antiferromagnetic material beta-Cu2V2O7 was investigated, revealing a pressure-induced phase transition to gamma-Cu2V2O7 below 4000 atm. The structural and electronic changes were studied using techniques such as single-crystal X-ray diffraction, absorption spectroscopy, and ab initio density functional theory calculations. These findings not only shed light on the potential barocaloric effects of beta-Cu2V2O7, but also suggest its significance as a multiferroic material with a decreased electronic band gap and a significant structural volume collapse.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Camino Martin-Sanchez, Ana Sanchez-Iglesias, Paul Mulvaney, Luis M. Liz-Marzan, Fernando Rodriguez
Summary: The effects of nonhydrostatic pressure on the morphology and stability of gold nanorods and nanospheres were studied. It was found that solvent solidification had a negligible effect on nanospheres, while nanorods were broken into smaller particles under nonhydrostatic conditions. However, colloidal stability was maintained in all cases.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Virginia Monteseguro, Jose A. Barreda-Argueso, Javier Ruiz-Fuertes, Angelika D. Rosa, Holger L. Meyerheim, Tetsuo Irifune, Fernando Rodriguez
Summary: This study presents an advanced experimental and theoretical model to explain the correlation between the electronic and local structure of Eu2+ in EuS compound. The pressure evolution of the crystal field plays a major role in triggering the observed electronic transitions from semiconductor to half-metal and finally to the metallic state.
SCIENTIFIC REPORTS
(2022)
Editorial Material
Physics, Multidisciplinary
V. Monteseguro, J. Ruiz-Fuertes, J. A. Barreda-Argueso, H. L. Meyerheim, A. D. Rosa, F. Rodriguez
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Camino Martin-Sanchez, Ana Sanchez-Iglesias, Jose Antonio Barreda-Argueso, Alain Polian, Luis M. Liz-Marzan, Fernando Rodriguez
Summary: The mechanical properties and stability of metal nanoparticle colloids under high-pressure conditions are investigated using optical extinction spectroscopy and small-angle X-ray scattering (SAXS). SAXS allows in situ monitoring of the structural evolution of nanoparticles induced by pressure, including nanoparticle size, shape, and aggregation. The differences in behavior observed under hydrostatic and nonhydrostatic conditions are explained in terms of liquid solidification processes leading to nanoparticle aggregation. The impact of nanoparticle shape on the aggregation process is also discussed.
Article
Nanoscience & Nanotechnology
Elena Navarro-Palomares, Lorena Garcia-Hevia, Jesus Galan-Vidal, Alberto Gandarillas, Fe Garcia-Reija, Ana Sanchez-Iglesias, Luis M. Liz-Marzan, Rafael Valiente, Monica L. Fanarraga
Summary: In this study, a high-affinity protein-ligand was designed using Shiga toxin to target specific receptors in head and neck tumors. Functionalized gold nanorods were able to selectively kill targeted cancer cells after laser radiation. This research demonstrates the potential of using natural ligands to guide nanomedicines for the treatment of aggressive localized cancers.
INTERNATIONAL JOURNAL OF NANOMEDICINE
(2022)
Article
Materials Science, Multidisciplinary
A. Liang, F. Rodriguez, P. Rodriguez-Hernandez, A. Munoz, R. Turnbull, D. Errandonea
Summary: High-pressure optical-absorption measurements were conducted on polycrystalline Co(IO3)(2) samples to investigate the influence of pressure on the electronic properties and fundamental band gap of Co(IO3)(2). The results revealed unusual behavior in the electron-lattice coupling of Co(IO3)(2), and the d-d transitions were explained by changes in the CoO6 octahedral units.
Article
Materials Science, Multidisciplinary
Enrique Jara, Rafael Valiente, Jesus Gonzalez, Jose Ignacio Espeso, Nicholas Khaidukov, Fernando Rodriguez
Summary: This study presents a spectroscopic investigation of doubly Mn4+ and Cr3+-doped Sr4Al14O25 to evaluate its potential as a red emitting phosphor. The results show that Sr4Al14O25 exhibits a ruby-like emission due to the strong crystal field effect of Cr3+. The photoluminescence and excitation spectra of Sr4Al14O25:Mn4+,Cr3+ reveal a non-centrosymmetric distorted Al4 site in the crystal structure. Additionally, the study highlights the effects of pressure and temperature on the photoluminescence intensity and lifetime of the material.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
J. A. Barreda-Argueso, F. Rodriguez
Summary: This study investigates the Ni-F distance dependence of Ni2+ crystal-field transitions in KNiF3 through high-pressure spectroscopy, revealing a correlation between Ni-F bond distance and 10Dq. The experimental data provides insight into the suitability of theoretical models and alternative methods for determining bond distances in impurity systems. Furthermore, the analysis of weak UV peaks below the charge-transfer band gap in the absorption spectrum sheds light on single and double excitation transitions.
