Article
Materials Science, Multidisciplinary
Kyuil Cho, M. Konczykowski, S. Teknowijoyo, S. Ghimire, M. A. Tanatar, Vivek Mishra, R. Prozorov
Summary: In this study, controlled artificial disorder was induced in a high-quality optimally doped YBa2Cu3O7-δ single crystal using electron irradiation, causing a significant suppression of the superconductor's critical temperature and a transition in the low-temperature behavior of the London penetration depth λ(T). The evolution of the superfluid density was analyzed by varying the amount and strength of nonmagnetic scattering, providing insights into the scattering potential strength and phase shift.
Article
Physics, Applied
Hui Yang, Guo-Hong Yun, Yong-Jun Cao
Summary: A two-dimensional magnonic crystal (MC) with an asymmetric complex basis is proposed in this paper, and its band structures are calculated across the entire first Brillouin zone (BZ). The unit cell of this type of MC is composed of two different atoms, leading to a breaking of symmetry and expansion of the irreducible part of the BZ. Only by investigating the entire first BZ can the true full band-gap for this kind of MC be obtained.
MODERN PHYSICS LETTERS B
(2021)
Article
Materials Science, Multidisciplinary
W. M. Linhart, S. J. Zelewski, P. Scharoch, F. Dybala, R. Kudrawiec
Summary: Bi2S3 is a potential solar absorber with optoelectronic properties determined through experimental techniques and theoretical calculations. The material exhibits a fundamental absorption edge and photoreflectance transition value of 1.30 eV at room temperature, with significant energy change in the fundamental gap between 20 and 300 K. Theoretical predictions show that Bi2S3 has an indirect band gap with band nesting, and experimental methods confirm the dominance of direct optical transitions.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Jiang Cao, Dorde Dangic, Jose D. Querales-Flores, Stephen Fahy, Ivana Savic
Summary: Through first-principles calculations, it has been found that soft zone-center transverse optical phonons do not deteriorate the electronic thermoelectric properties of PbTe when brought closer to the phase transition via lattice expansion due to external stress. In fact, they enhance the thermoelectric figure of merit.
Article
Physics, Applied
Ariel Roitman, A. Shaulov, Y. Yeshurun
Summary: An improved YBa2Cu3O7-delta-based microwave kinetic inductance detector with a quality factor Qi > 2.5x104 is demonstrated.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Donna J. Shillington, Anne Becel, Mladen R. Nedimovic
Summary: This study presents a P-wave seismic velocity model based on wide-angle seismic data and reflection imaging, focusing on the Weakly Coupled Shumagin Gap in the Alaska subduction zone. The results reveal that the earthquake in this region occurred near and below the Moho boundary of the overriding plate, where the megathrust is characterized by a 3- to 5-km-thick reflection band interpreted as tectonic mixing. The rheological heterogeneity near and below the Moho is suggested to be responsible for the abundant interplate seismicity, repeated M7.x events, and irregularity of the 2020 rupture. Velocity variations in the overriding continental crust may also influence megathrust slip behavior.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Green & Sustainable Science & Technology
Amin Najjarnezami, Mohammad Kalteh
Summary: This paper numerically analyzes a near-field thermophotovoltaic (TPV) system with a dual TPV cell design. The radiation heat flux is calculated using fluctuational electrodynamics and the dyadic Green's function. The generated photocurrent and conversion efficiency are obtained by solving photon-coupled charge transport equations. It is found that the addition of a second TPV cell increases the generated photocurrent by absorbing low-energy photons and generating electron-hole pairs. Increasing the gap size between the emitter and Si TPV cell decreases the generated photocurrent due to reduced near-field thermal radiation effects. The tandem nano-gap TPV system exhibits higher conversion efficiency than a single Si TPV cell, with an optimum gap size of d1 = 200 nm.
Article
Materials Science, Multidisciplinary
Soumya Datta, Sandeep Howlader, Arushi, Ravi Prakash Singh, Goutam Sheet
Summary: Experimental exploration of the physics of anisotropic superconductors near a critical B point remains an unattained goal, and ZrB12 can be used as a model material system to study such phenomena.
Article
Chemistry, Multidisciplinary
Johan Iskandar, Chih-Chien Lee, Ade Kurniawan, Hsin-Ming Cheng, Shun-Wei Liu, Sajal Biring
Summary: Near-infrared light-emitting diodes (NIR-LEDs) are widely used in various fields. However, the development of NIR-LEDs based on methyl-ammonium lead iodide is limited by poor film quality and increased defect states. By modifying the interface with phenethylammonium iodide, these issues can be resolved, resulting in high-quality films and efficient NIR-LEDs.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Physics, Applied
Stefan Zollner, Shivashankar R. Vangala, Vladimir L. Tassev, Duane Brinegar, Samuel Linser
Summary: The infrared dielectric function of thick GaAs1-xPx alloy layers was studied using Fourier-transform infrared ellipsometry, revealing the presence of GaAs-like and GaP-like optical phonons. The lattice absorption peaks exhibited asymmetric shapes, and the cluster model provided a better fit to the experimental data.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Condensed Matter
Yang Li, Yang Cao, Yuanping Chen, Xiaosen Yang
Summary: This paper presents a non-Bloch band theory for one-dimensional non-Hermitian topological superconductors, revealing their universal physical properties and the relationship between particle-hole symmetry and quantum phase transitions. It also applies the non-Bloch band theory to two examples of non-Hermitian p- and s-wave topological superconductors and establishes the non-Hermitian bulk-boundary correspondence through the Z(2) non-Bloch topological invariant.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Binying Wang, Jinxing Liu, Ai Kah Soh, Naigang Liang
Summary: In this study, an accurate strain gradient continuum model is proposed to capture the broadband bandgap characteristics of prestressed diatomic lattice. The model can accurately predict the behavior when the wavelength is close to the lattice scale and is consistent with the results of the discrete model.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Kunie Ishioka, Alexej Pashkin, Christian Bernhard, Hrvoje Petek, Xin Yao, Jure Demsar
Summary: We investigate coherent lattice dynamics in optimally doped YBa2Cu3O7-delta driven by ultrashort near-infrared and near-ultraviolet pulses. Transient reflectivity experiments reveal Ag-symmetry phonon modes related to bending in the CuO2 planes and stretching at frequencies between 10 and 15 THz. The relative coherent phonon amplitudes are in stark contrast to the relative phonon intensities in the spontaneous Raman scattering spectrum, indicating mode-dependent contributions of Raman and non-Raman mechanisms to coherent phonon generation.
Article
Engineering, Mechanical
Yanhua Zhao, Nana Yin, Bohan Xu, Ye Tao
Summary: The study proposes a fracture model for concrete based on the boundary effect theory, which relates the nondimensional nominal stress and equivalent crack size. The model describes three fracture modes without introducing additional parameters. By choosing an appropriate stress distribution along the crack tip, the model can extract the fracture properties of concrete using only the maximum load and necessary geometrical information of specimens.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Multidisciplinary Sciences
Zikang Ye, Xing Lin, Na Wang, Jianhai Zhou, Meiyi Zhu, Haiyan Qin, Xiaogang Peng
Summary: Phonon-assisted up-conversion photoluminescence boosts energy by absorbing vibration energy, and colloidal quantum dots can be used as efficient, stable, and cost-effective emitters for up-conversion photoluminescence.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Arun Kumar Jaiswal, Di Wang, Vanessa Wollersen, Rudolf Schneider, Matthieu Le Tacon, Dirk Fuchs
Summary: The 5d iridium-based transition metal oxides with strong spin-orbit coupling have attracted broad interest. However, due to weak electron-electron correlation, they rarely exhibit mainstream orders like ferromagnetism. In this study, a proximity-induced ferromagnetic state is achieved in a SrIrO3 heterostructure through interfacial charge transfer. The research also reveals a strong pseudospin-lattice coupling in the anomalous Hall effect at low temperature.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Romain Grasset, Kota Katsumi, Pierre Massat, Hai-Hu Wen, Xian-Hui Chen, Yann Gallais, Ryo Shimano
Summary: We investigated the collective mode response of the iron-based superconductor Ba1-xKxFe2As2 using intense terahertz light. A THz Kerr signal was observed in the superconducting state and found to be remarkably sensitive to the coexistence of a nematic order.
NPJ QUANTUM MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
A. K. Jaiswal, R. Schneider, M. Le Tacon, D. Fuchs
Summary: Transition-metal oxide (TMO) based heterostructures provide an important platform to study and functionalize novel quantum materials. The combination of 3d and 5d TMOs with strong spin-orbit coupling and electron correlation has gained special interest. Artificial breaking of the inversion symmetry may result in distinct interfacial Dzyaloshinskii-Moriya interaction (DMI) and the formation of non-collinear magnetic spin structures.
Article
Materials Science, Multidisciplinary
Hung-Hsiang Yang, Namrata Bansal, Philipp Ruessmann, Markus Hoffmann, Lichuan Zhang, Dongwook Go, Qili Li, Amir-Abbas Haghighirad, Kaushik Sen, Stefan Blugel, Matthieu Le Tacon, Yuriy Mokrousov, Wulf Wulfhekel
Summary: In this research, the magnetic bubble domains and microscopic domain wall profile in Fe3GeTe2 are investigated using spin-polarized scanning tunneling microscopy and atomistic spin-dynamics simulations. The study reveals a weak magneto-electric effect on the domain wall width and determines the critical magnetic field for the collapse of the bubble domains. These findings shed light on the complex magnetism exhibited by Fe3GeTe2.
Article
Multidisciplinary Sciences
Lichen Wang, Guanhong He, Zichen Yang, Mirian Garcia-Fernandez, Abhishek Nag, Kejin Zhou, Matteo Minola, Matthieu Le Tacon, Bernhard Keimer, Yingying Peng, Yuan Li
Summary: By studying two members of the model Hg family, it is found that the energy of magnetic fluctuations may limit the highest critical temperature of cuprate superconductors, providing important clues for understanding the superconducting mechanism. Furthermore, the correlation between paramagnon energy and maximal critical temperature is also confirmed in other cuprate families.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Jean-Come Philippe, Alexis Lespinas, Jimmy Faria, Anne Forget, Dorothee Colson, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Indranil Paul, Yann Gallais
Summary: Anisotropic strain selectively affects the role of nematic fluctuations in promoting superconductivity. Our results confirm the significance of nematic fluctuations in electron pairing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Kota Katsumi, Alexandr Alekhin, Sofia-Michaela Souliou, Michael Merz, Amir-Abbas Haghighirad, Matthieu Le Tacon, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Yann Gallais
Summary: In this study, the nonequilibrium photoexcited state of Ta2NiSe5 was investigated using pump-probe Raman and photoluminescence spectroscopies. The combined spectroscopic measurements of the lattice and electronic states revealed the presence of a photoexcited metastable state where the insulating gap is suppressed, but the low-temperature structural distortion is preserved. It was concluded that electron correlations play a vital role in the semiconductor-to-insulator transition of Ta2NiSe5.
PHYSICAL REVIEW LETTERS
(2023)
Correction
Multidisciplinary Sciences
Lichen Wang, Guanhong He, Zichen Yang, Mirian Garcia-Fernandez, Abhishek Nag, Kejin Zhou, Matteo Minola, Matthieu Le Tacon, Bernhard Keimer, Yingying Peng, Yuan Li
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
M. Verseils, P. Hemme, D. Bounoua, R. Cervasio, J-b. Brubach, S. Houver, Y. Gallais, A. Sacuto, D. Colson, T. Iijima, M. Mochizuki, P. Roy, M. Cazayous
Summary: Electromagnons in cupric oxide (CuO) were tracked using synchrotron radiation infrared spectroscopy under hydrostatic pressure, and it was found that a low pressure of 3.3 GPa significantly increased the strength of the electromagnon and expanded its existence to a larger temperature range by 40 K. This makes CuO under pressure a more ductile quantum object.
NPJ QUANTUM MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Arun Kumar Jaiswal, Robert Eder, Di Wang, Vanessa Wollersen, Matthieu Le Tacon, Dirk Fuchs
Summary: This study demonstrates nonvolatile electrical control of proximity-induced magnetism in SrIrO3 based on back-gated heterostructures. The system shows a large tunability, opening up new avenues for efficient electric-field manipulation of magnetism.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mai Ye, Mark Joachim Graf von Westarp, Sofia-Michaela Souliou, Marius Peters, Robert Moeller, Kristin Kliemt, Michael Merz, Rolf Heid, Cornelius Krellner, Matthieu Le Tacon
Summary: The valence crossover and strong electron-phonon coupling of EuPd2Si2 were studied using polarization-resolved Raman spectroscopy. The fully symmetric phonon mode exhibited a strongly asymmetric line shape at low temperature, indicating Fano-type interaction with a continuum of electron-hole excitations. Additionally, anomalies in the frequency and linewidth of the phonon modes were observed across the valence-crossover temperature, suggesting coupling between valence fluctuations and lattice vibration. Density-functional-theory calculations were used to evaluate the relative contribution of structural change and valence change to the phonon anomalies.
Article
Materials Science, Multidisciplinary
K. Sen, R. Heid, S. M. Souliou, D. Boll, A. Bosak, N. H. Sung, J. Bertinshaw, H. Gretarsson, B. J. Kim, F. Weber, M. Le Tacon
Summary: We investigated the lattice dynamics of Sr2IrO4 and Sr3Ir2O7 by high-resolution inelastic x-ray scattering. Our results show that the phonon energies and scattering intensities are in excellent agreement with theoretical calculations. No renormalization of phonons at finite momentum was observed in Sr2IrO4, while an anomalous behavior was detected in the in-plane polarized longitudinal-acoustic phonon branch in Sr3Ir2O7, which may be related to anisotropic negative thermal expansion in this compound.
Article
Materials Science, Multidisciplinary
Jean-Come Philippe, Jimmy Faria, Anne Forget, Dorothee Colson, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Yann Gallais
Summary: The study shows that the polarization resolved arsenic (As) phonon intensity can be used to monitor the nematic order parameter in the iron-based superconductor BaFe2As2 as a function of both temperature and strain. The elasto-Raman scattering study illustrates the interest of combining selective anisotropic strain with a symmetry-resolved probe like Raman scattering in a wide variety of quantum materials where uniaxial strain tunes electronic orders.
Article
Materials Science, Multidisciplinary
M. Frachet, Daniel J. Campbell, Anne Missiaen, S. Benhabib, Francis Laliberte, B. Borgnic, T. Loew, J. Porras, S. Nakata, B. Keimer, M. Le Tacon, Cyril Proust, I Paul, David LeBoeuf
Summary: For orthorhombic superconductors, we studied the thermodynamic anisotropy N, defined as the difference in how superconducting T-c varies with in-plane strains, in underdoped YBa2Cu3Oy (YBCO) single crystals. The results showed an intriguing enhancement of thermodynamic anisotropy at intermediate doping levels, which can be attributed to electronic effects. The theoretical analysis suggests that this enhancement is related to the pseudogap potential in the electronic spectrum. The study implies the possibility of strain engineering the pseudogap potential to enhance superconducting T-c.
