Article
Multidisciplinary Sciences
Alon Gutfreund, Hisakazu Matsuki, Vadim Plastovets, Avia Noah, Laura Gorzawski, Nofar Fridman, Guang Yang, Alexander Buzdin, Oded Millo, Jason W. A. Robinson, Yonathan Anahory
Summary: The interplay between magnetism and superconductivity can give rise to unconventional proximity and Josephson effects. A recent phenomenon attracting considerable attention is the superconducting diode effect, where a nonreciprocal critical current emerges. Although superconducting diodes based on superconductor/ferromagnet (S/F) bilayers were demonstrated more than a decade ago, the underlying mechanism remains unclear. The authors directly observe asymmetric vortex dynamics that reveal the mechanism behind the superconducting vortex diode effect in Nb/EuS (S/F) bilayers.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Ning Li, Xiangdong Guo, Xiaoxia Yang, Ruishi Qi, Tianyu Qiao, Yifei Li, Ruochen Shi, Yuehui Li, Kaihui Liu, Zhi Xu, Lei Liu, F. Javier Garcia de Abajo, Qing Dai, En-Ge Wang, Peng Gao
Summary: The study successfully measured and observed phonon polaritons in monolayer hexagonal boron nitride using monochromatic electron energy-loss spectroscopy, revealing highly confined and ultraslow group velocity characteristics. The large momentum compensation provided by electron beams also enabled phonon polariton excitation over the entire Reststrahlen band of multilayer hexagonal boron nitride.
Article
Materials Science, Multidisciplinary
Renjiu Hu, Zhiting Tian
Summary: This work presents direct evidence of phonon Anderson localization by observing the exponential decay of mode-resolved transmissions. The study successfully captures localized modes in different structures, even when thermal conductivity trend is monotonically upward.
Article
Physics, Multidisciplinary
Quynh L. D. Nguyen, Jacopo Simoni, Kevin M. Dorney, Xun Shi, Jennifer L. Ellis, Nathan J. Brooks, Daniel D. Hickstein, Amanda G. Grennell, Sadegh Yazdi, Eleanor E. B. Campbell, Liang Z. Tan, David Prendergast, Jerome Daligault, Henry C. Kapteyn, Margaret M. Murnane
Summary: By exciting nanoparticles, researchers have successfully created uniformly excited warm dense matter (WDM). Using photoelectron spectroscopy, they measured the instantaneous electron temperature and determined the strong coupling between the electrons and the ions. The findings are important for understanding the properties of WDM.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Idan Tamir, Martina Trahms, Franzisca Gorniaczyk, Felix von Oppen, Dan Shahar, Katharina J. Franke
Summary: Magnetic disorder is present at the surface of amorphous superconducting films and can play a crucial role in the properties of the films, as well as the transition from superconducting to insulating phase.
Article
Physics, Multidisciplinary
Sheng Liu, Andres Granados del Aguila, Dhiman Bhowmick, Chee Kwan Gan, T. Thu Ha Do, M. A. Prosnikov, David Sedmidubsky, Zdenek Sofer, Peter C. M. Christianen, Pinaki Sengupta, Qihua Xiong
Summary: In FePS3, strong coupling between magnons and phonons was directly observed using magneto-Raman spectroscopy at magnetic fields up to 30 Tesla. A hybridized magnon-phonon quasiparticle formed due to field-driven resonance with a nearby phonon mode. The polarized Raman results demonstrated the transfer of spin angular momentum from magnons to phonons, generating phonon spin through strong coupling.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Jia-Qi Fan, Xue-Qing Yu, Fang-Jun Cheng, Heng Wang, Ruifeng Wang, Xiaobing Ma, Xiao-Peng Hu, Ding Zhang, Xu-Cun Ma, Qi-Kun Xue, Can-Li Song
Summary: Experimental evidence reveals nodeless superconductivity and three lattice vibrational modes in structurally simplest infinite-layer cuprate superconductors Sr1-xNdxCuO2.
NATIONAL SCIENCE REVIEW
(2022)
Article
Chemistry, Physical
Zhongyu Liu, Yingwei Li, Wonyong Shin, Rongchao Jin
Summary: This study compared thin-film and solution-based measurements to reveal the existence of core phonons in Au-25 nanoclusters, as well as the suppression mechanism of staple-shell phonons in the solid state.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Applied
Jayanta Bhattacharjee, S. D. Singh
Summary: Raman spectroscopy is used to investigate the phonon mode behavior of a beta-(AlxGa1-x)(2)O-3 alloy with Al compositions up to x=0.474. The alloy exhibits a mixed-mode behavior, with low frequency modes showing monotonic behavior and high frequency modes displaying one-mode behavior. Medium frequency modes show sudden changes and two-mode behavior with Al substitution. The existence of two sublattices is supported by the preferential occupation of Al atoms. These findings provide insight into the phonon mode behavior of beta-(AlxGa1-x)(2)O-3 alloys and their physical properties.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Gloria Anemone, Pablo Casado Aguilar, Manuela Garnica, Fabian Calleja, Amjad Al Taleb, Chia-Nung Kuo, Chin Shan Lue, Antonio Politano, Amadeo L. Vazquez de Parga, Giorgio Benedek, Daniel Farias, Rodolfo Miranda
Summary: The electron-phonon interaction in type II Dirac semimetallic 1T-PdTe2 has been determined using helium atom scattering, indicating a substantial electron-phonon coupling which is crucial for its superconductivity. This coupling value, along with the surface Debye temperature, accurately predicts the superconducting critical temperature, suggesting that the topological states of a Dirac cone have minimal influence on the onset of superconductivity.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Chemistry, Physical
Nimrod Benshalom, Maor Asher, Remy Jouclas, Roman Korobko, Guillaume Schweicher, Jie Liu, Yves Geerts, Olle Hellman, Omer Yaffe
Summary: We have discovered that the polarization dependence of Raman scattering in organic crystals at finite temperatures can only be explained using a fourth-rank tensor formalism. This extension of the second-rank Raman tensor is a result of the off diagonal components in the crystal self-energy affecting the light scattering mechanism. Therefore, we have established a new manifestation of phonon-phonon interaction in inelastic light scattering, which is distinct from the well-known phonon lifetime.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Zhe Cheng, Ruiyang Li, Xingxu Yan, Glenn Jernigan, Jingjing Shi, Michael E. Liao, Nicholas J. Hines, Chaitanya A. Gadre, Juan Carlos Idrobo, Eungkyu Lee, Karl D. Hobart, Mark S. Goorsky, Xiaoqing Pan, Tengfei Luo, Samuel Graham
Summary: Localized interfacial phonon modes have been observed at a high-quality epitaxial Si-Ge interface at around 12 THz, which significantly contribute to the total thermal boundary conductance. Through molecular dynamics simulations and experimental validation, the impact of these interfacial phonon modes on total thermal boundary conductance has been revealed.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Lin Yang, Yi Tao, Yanglin Zhu, Manira Akter, Ke Wang, Zhiliang Pan, Yang Zhao, Qian Zhang, Ya-Qiong Xu, Renkun Chen, Terry T. Xu, Yunfei Chen, Zhiqiang Mao, Deyu Li
Summary: This study observed length-dependent thermal conductivity in ultrathin van der Waals crystal NbSe3 nanowires, providing experimental evidence for superdiffusive phonon transport. Contrary to the classical size effect due to phonon-boundary scattering, the observed thermal conductivity showed an enhancement as the characteristic size of the nanowires decreased.
NATURE NANOTECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
V Iaia, J. Ku, A. Ballard, C. P. Larson, E. Yelton, C. H. Liu, S. Patel, R. McDermott, B. L. T. Plourde
Summary: Researchers achieve a suppression of correlated error rate by channeling high-energy particle impacts caused by background radiation away from the qubits via a thick metal layer at the bottom of the chip. They also use a pump-probe scheme to monitor the parity of quasiparticles on qubit chips and observe a significant reduction in correlated poisoning.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Junhong Yu, Sujuan Hu, Huayu Gao, Savas Delikanli, Baiquan Liu, Jacek J. Jasieniak, Manoj Sharma, Hilmi Volkan Demir
Summary: By investigating the emission properties, it has been observed that Cu-doped CQWs have efficient phonon cascade process and a giant Huang-Rhys factor, indicating an ultrastrong electron-phonon coupling. These findings challenge the widely accepted consensus and have important implications for optoelectronic applications of doped electronic nanomaterials.
Article
Materials Science, Multidisciplinary
F. J. Maier, M. Schneider, J. Schrattenholzer, W. Artner, K. Hradil, A. Artemenko, A. Kromka, U. Schmid
Article
Materials Science, Characterization & Testing
Dieter Ingerle, Werner Artner, Klaudia Hradil, Christina Streli
POWDER DIFFRACTION
(2020)
Article
Instruments & Instrumentation
D. Ingerle, J. Swies, M. Iro, P. Wobrauschek, C. Streli, K. Hradil
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Multidisciplinary Sciences
Jonas Hafner, Simone Benaglia, Filipe Richheimer, Marco Teuschel, Franz J. Maier, Artner Werner, Sebastian Wood, Daniel Platz, Michael Schneider, Klaudia Hradil, Fernando A. Castro, Ricardo Garcia, Ulrich Schmid
Summary: This study demonstrates that the semi-crystalline morphology of ferroelectric copolymer P(VDF-TrFE) significantly influences its Curie transition, involving changes in both crystal symmetry and morphology. Quantitative multi-scale characterizations reveal the complex nature of Curie transition in ferroelectric polymeric materials with an intermixture of crystalline and amorphous regions.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Philipp Kurzhals, Geoffroy Kremer, Thomas Jaouen, Christopher W. Nicholson, Rolf Heid, Peter Nagel, John-Paul Castellan, Alexandre Ivanov, Matthias Muntwiler, Maxime Rumo, Bjoern Salzmann, Vladimir N. Strocov, Dmitry Reznik, Claude Monney, Frank Weber
Summary: Electron-phonon coupling is a common phenomenon in solids, leading to emergent ground states such as superconductivity. This study demonstrates that strong phonon broadening can occur in the absence of Fermi surface nesting or lattice anharmonicity, if electron-phonon coupling is enhanced for specific electron momenta. The findings suggest a new mechanism for understanding phonon anomalies in materials.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Yi Yao, Roland Willa, Tom Lacmann, Sofia-Michaela Souliou, Mehdi Frachet, Kristin Willa, Michael Merz, Frank Weber, Christoph Meingast, Rolf Heid, Amir-Abbas Haghighirad, Joerg Schmalian, Matthieu Le Tacon
Summary: Understanding the organizing principles of interacting electrons and the emergence of novel electronic phases is a central endeavor of condensed matter physics. Electronic nematicity, in which the discrete rotational symmetry in the electron fluid is broken while the translational one remains unaffected, is a prominent example of such a phase. Fluctuations of such broken symmetry are found to be exceptionally strong over an extended temperature range above phase transitions in BaNi2(As1-xPx)(2), supporting a type of electronic nematicity that exhibits a strong coupling to the underlying crystal lattice, akin to spin liquids in magnetic systems.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Xingchen Shen, Michael Marek Koza, Yung-Hsiang Tung, Niuchang Ouyang, Chun-Chuen Yang, Chen Wang, Yue Chen, Kristin Willa, Rolf Heid, Xiaoyuan Zhou, Frank Weber
Summary: The coexistence of rigid and mobile sublattices in superionic Argyrodites leads to low thermal conductivity and high electrical and ionic conductivities, making it attractive for various applications. However, the understanding of the underlying lattice and diffusive dynamics in terms of the interaction between phonons and mobile ions is still incomplete. In this study, inelastic neutron scattering and molecular dynamics simulations are used to reveal that phonon softening triggers fast diffusion of Ag ions in superionic Argyrodite Ag8GeSe6. This study demonstrates the microscopic connection between soft phonons and mobile ions and provides insights into the intertwined lattice and diffusive dynamics in superionic materials.
Article
Chemistry, Physical
Anna Gruenebohm, Andreas Huetten, Anna E. Boehmer, Jan Frenzel, Ilya Eremin, Ralf Drautz, Inga Ennen, Luana Caron, Timo Kuschel, Frank Lechermann, Dario Anselmetti, Thomas Dahm, Frank Weber, Kai Rossnagel, Gabi Schierning
Summary: This article presents a unified framework to understand the properties and functionalities of displacive phase transition materials, by identifying similarities, defining a unified phenomenological description, and introducing symmetry-breaking mechanisms. This framework aims to bring together experimental and theoretical knowledge across disciplines to unravel important mechanistic understanding about phase transitions in various materials. Connecting structural and electronic phenomena to functional properties may lead to innovative applications based on these materials.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ruihuan Cheng, Xingchen Shen, Stefan Klotz, Zezhu Zeng, Zehua Li, Alexandre Ivanov, Yu Xiao, Li-Dong Zhao, Frank Weber, Yue Chen
Summary: In this study, the high-pressure lattice dynamics of PbTe were investigated using molecular dynamics simulations. The results show that the transverse-optical mode and the frequency of the transverse-acoustic phonon exhibit non-monotonic pressure dependence under high pressure. The theoretical predictions were compared with experimental data, and the phonon transport mechanisms were revealed by calculating the pressure-dependent lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Nazir Khan, Sven Krannich, Dominic Boll, Rolf Heid, Daniel Lamago, A. Ivanov, David Voneshen, Frank Weber
Summary: The phonon renormalization across the semiconductor-to-metal crossover in FeSi is investigated using inelastic neutron scattering and ab initio lattice dynamical calculations. The study reveals that the anomalous phonon softening upon metallization is not exclusive to specific symmetry points, but also occurs at various other points in reciprocal space. The momentum dependence of the phonon softening is reproduced by lattice dynamical calculations based on density functional perturbation theory.
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
Zehua Li, Shasha Li, John-Paul Castellan, Rolf Heid, Yu Xiao, Li-Dong Zhao, Yue Chen, Frank Weber
Summary: This study investigates the soft transverse optic phonon mode in SnTe compared to PbTe using inelastic neutron scattering and ab initio lattice dynamical calculations. The calculations predict that the soft mode in SnTe has a strongly asymmetric spectral weight distribution similar to PbTe, contrary to previous reports. Experimentally, the overall width of the phonon peaks in the neutron scattering spectra is found to be comparable in SnTe and PbTe.
Article
Physics, Multidisciplinary
C. Pappas, A. O. Leonov, L. J. Bannenberg, P. Fouquet, T. Wolf, F. Weber
Summary: The addition of iron in manganese iron silicon increases frustration possibly caused by achiral Ruderman-Kittel-Kasuya-Yosida interactions, which explains the expansion of precursor phase with increasing doping concentration and the abrupt disappearance of long range helimagnetic periodicity at a certain concentration.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Z. H. Li, D. Hudry, R. Heid, A. H. Said, M. D. Le, R. Popescu, D. Gerthsen, M. Merz, K. W. Kramer, D. Busko, I. A. Howard, B. S. Richards, F. Weber
Article
Materials Science, Multidisciplinary
Blair W. Lebert, Hajime Yamamoto, Masaki Azuma, Rolf Heid, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q. R. Baron, Benoit Baptiste, Matteo d'Astuto
