Article
Multidisciplinary Sciences
Song Bao, Zhao-Long Gu, Yanyan Shangguan, Zhentao Huang, Junbo Liao, Xiaoxue Zhao, Bo Zhang, Zhao-Yang Dong, Wei Wang, Ryoichi Kajimoto, Mitsutaka Nakamura, Tom Fennell, Shun-Li Yu, Jian-Xin Li, Jinsheng Wen
Summary: In this study, magnon polarons were observed using neutron spectroscopy on a multiferroic material Fe2Mo3O8, and their topologically non-trivial properties were discovered. This uncovers exotic elementary excitations arising from the magnon-phonon coupling and offers a new route to topological states by considering hybridizations between different types of fundamental excitations.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Qiqi Zhang, Xiaoguang Li, Jing Zhu
Summary: Multiferroic tunnel junctions (MFTJs) have been studied as a potential candidate for nonvolatile memory devices, with recent reports showing their resistance can be continuously tuned with applied voltage. The performance of MFTJs is closely related to their interfacial structures, necessitating investigation at the atomic scale.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Multidisciplinary Sciences
Xiujuan Zhang, Yuan Tian, Jian-Hua Jiang, Ming-Hui Lu, Yan-Feng Chen
Summary: The study demonstrates the higher-order non-Hermitian skin effect in two-dimensional acoustic higher-order topological insulators, where non-Hermiticity drives wave localizations toward opposite edges upon different spin polarizations. Additionally, for finite systems with both edges and corners, the higher-order non-Hermitian skin effect leads to wave localizations toward two opposite corners in a spin-dependent manner, allowing for rich wave manipulation.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Alexander Neef, Samuel Beaulieu, Sebastian Hammer, Shuo Dong, Julian Maklar, Tommaso Pincelli, R. Patrick Xian, Martin Wolf, Laurenz Rettig, Jens Pflaum, Ralph Ernstorfer
Summary: Singlet fission can double the number of excited charge carriers by transforming a singlet exciton into two triplet excitons, thereby boosting photovoltaic efficiency. The primary step of singlet fission, the creation of correlated triplet pairs, has multiple proposed mechanisms but lacks consensus. This study used time- and angle-resolved photoemission spectroscopy to observe the primary step of singlet fission in crystalline pentacene and found evidence of a charge-transfer mediated mechanism with hybridization of Frenkel and charge-transfer states in the lowest bright singlet exciton. The orbital and localization characteristics of the exciton wave functions were analyzed, providing insights into the mechanics of molecular systems and topological materials.
Article
Chemistry, Physical
Le-Ping Miao, Ning Ding, Na Wang, Chao Shi, Heng-Yun Ye, Linglong Li, Ye-Feng Yao, Shuai Dong, Yi Zhang
Summary: Sliding ferroelectricity is a polarity observed in two-dimensional materials. We report the direct observation of sliding ferroelectricity in a single-crystal coordination polymer with a large bandgap. This finding provides important insights into low-dimensional ferroelectrics and their control.
Article
Nanoscience & Nanotechnology
Lu Zhang, Huanfang Tian, Sining Dong, Dong Yang, Xiaoguang Li, Jun Li, Jianqi Li, Huaixin Yang
Summary: The structural modulations in multiferroic Bi4.2K0.8Fe2O9+delta (BKFO) nanobelts have been uncovered by scanning transmission electron microscopy (STEM). The displacive modulations can be decomposed into a transverse wave and a longitudinal wave, whose amplitudes and phases are layer-dependent. This study may help to understand and optimize the magnetoelectric coupling effect in BKFO.
SCRIPTA MATERIALIA
(2021)
Article
Multidisciplinary Sciences
Thomas Hartke, Botond Oreg, Carter Turnbaugh, Ningyuan Jia, Martin Zwierlein
Summary: The Hubbard model of attractively interacting fermions is used to study fermion pairing. In this model, a crossover between tightly bound pairs and long-range Cooper pairs occurs, with a pseudo-gap region above the superfluid critical temperature. By directly observing a Hubbard lattice gas of fermionic potassium-40 atoms under a bilayer microscope, the nonlocal nature of fermion pairing is revealed. The study also provides insights into the pseudo-gap behavior in strongly correlated fermion systems.
Article
Chemistry, Physical
Trinh Thi Ly, Yun-Jae Lee, Byoung Ki Choi, Hojun Lee, Hyuk Jin Kim, Ganbat Duvjir, Nguyen Huu Lam, Kyuha Jang, Krisztian Palotas, Young Jun Chang, Aloysius Soon, Jungdae Kim
Summary: Researchers investigate an emergent interface phenomenon between monolayer ReSe2 and graphene through combined STM and DFT studies, revealing a confined layer of electron density with trapped charges that is asymmetrically polarized and enhanced at the edge of ReSe2.
APPLIED SURFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Friedrich Roth, Mario Borgwardt, Lukas Wenthaus, Johannes Mahl, Steffen Palutke, Guenter Brenner, Giuseppe Mercurio, Serguei Molodtsov, Wilfried Wurth, Oliver Gessner, Wolfgang Eberhardt
Summary: Researchers used femtosecond time-resolved X-ray photoemission spectroscopy to investigate the ultrafast dynamics of photon-to-charge conversion in an organic light-harvesting system. They discovered a new pathway for charge generation and provided novel insights into light harvesting in organic heterojunctions.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Chunyong Yang, Rui Liu, Wenjun Ni, Shun Wang, Yongsheng Tian, Jin Hou, Shaoping Chen, Perry Ping Shum
Summary: In this work, the challenge of accurately unwrapping high-order orbital angular momentum (OAM) for multiplexed vortex beams is addressed. By utilizing optical imaging and intelligent pattern recognition, the OAM modes are separated and unwrapped successfully in the numerical domain. The combination of annular phase grating and auxiliary beams enables low-complexity and high-commonality optical intensity recognition, while the spiral direction characterizes the OAM states' symbol, significantly increasing the number of multiplexed links. The optical separating means assisted by intelligent pattern recognition opens up a new route for high-speed and large-capacity optical communication, with potential implications for 6G applications.
Article
Chemistry, Analytical
Huiqian Zhou, Han Lin, Qi Wang, Tingting Hao, Yufang Hu, Sui Wang, Zhiyong Guo
Summary: We developed an axis-mode donor-DNA-acceptor electrochemical system to distinguish electron transfer modes in DNA. By embedding the redox probe Ag+ in the DNA strand and controlling the number of Ag+, the distance between Ag+ and the electrode, and the chemical environment, the rotation and bending of the DNA strand were restricted, allowing precise control of the electron transfer mechanism. The results showed that electron transfer in DNA occurs through tunneling rather than hopping.
ANALYTICAL CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Xuefei Chen, Qi Wang, Zhiying Cheng, Mingliu Zhu, Hao Zhou, Ping Jiang, Lingling Zhou, Qiqi Xue, Fuping Yuan, Jing Zhu, Xiaolei Wu, En Ma
Summary: The study provides direct experimental evidence of chemical short-range atomic-scale ordering (CSRO) in a VCoNi medium-entropy alloy through diffraction and electron microscopy analysis. The research demonstrates that using specific crystallographic directions can reveal CSRO in face-centred-cubic VCoNi concentrated solution, offering insights into atomic packing configuration and dislocation interactions enhanced by CSROs.
Article
Physics, Multidisciplinary
Yi-Ming Wu, P. A. Nosov, Aavishkar A. Patel, S. Raghu
Summary: We describe and solve models with robust PDW phases, finding that the requirements for long-range PDW order are nonmonotonic repulsive BCS couplings in space and their strength exceeding a threshold value.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Zhongjie Wang, Lu Liu, Haoran Zheng, Meng Zhao, Ke Yang, Chunzheng Wang, Fang Yang, Hua Wu, Chunlei Gao
Summary: The growth and electronic structure of α-RuCl3 monolayer on a graphite substrate were studied, revealing important properties such as lattice expansion, orbital hybridization, and Mottness. The monolayer of α-RuCl3 satisfies the criteria for exploring Kitaev physics and provides a novel platform.
Article
Physics, Multidisciplinary
Amir Mahdian, Artjom Krukow, Johannes Hecker Denschlag
Summary: Collisions with cold particles can dissipate a hot particle's energy and a fast cooling process through resonant conversion has been suggested. Swap cooling and sympathetic cooling show different cooling dynamics, with numerical model calculations supporting the experimental results.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Fei Li, Vladimir Pomjakushin, Bertrand Roessli, Romain Sibille, Marisa Medarde, Kazimierz Conder, Ekaterina Pomjakushina
Summary: In this study, magnetization and neutron powder diffraction were conducted on oxygen stoichiometric R1/3Sr2/3FeO3 (R = Pr and Nd) in the temperature range of 2 K to 300 K. Two magnetic models were proposed through a combination of irreducible representations and magnetic space groups, and both models fit the neutron powder diffraction data equally well.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Multidisciplinary Sciences
Christopher Klose, Felix Buettner, Wen Hu, Claudio Mazzoli, Kai Litzius, Riccardo Battistelli, Ivan Lemesh, Jason M. Bartell, Mantao Huang, Christian M. Guenther, Michael Schneider, Andi Barbour, Stuart B. Wilkins, Geoffrey S. D. Beach, Stefan Eisebitt, Bastian Pfau
Summary: Nanoscale magnetic fluctuations are observed beyond conventional resolution limits using coherent correlation imaging, allowing for the study of previously inaccessible magnetic phenomena. The method utilizes Fourier space analysis and an iterative hierarchical clustering algorithm to achieve high spatial and temporal resolution.
Article
Materials Science, Multidisciplinary
Nelson Hua, Jianheng Li, Stjepan B. Hrkac, Andi Barbour, Wen Hu, Claudio Mazzoli, Stuart Wilkins, Roopali Kukreja, Eric E. Fullerton, Oleg G. Shpyrko
Summary: We studied charge-orbital fluctuations in the insulating state of magnetite using resonant elastic x-ray scattering and x-ray photon correlation spectroscopy. Our results revealed the dynamics of the iron 3d and oxygen 2p orbital domains, showing a decoupling of the orbital correlation lengths between the oxygen ligands and site-specific iron 3d states. We also observed charge-orbital domain fluctuations at the iron t(2g) orbital sites of trimeron chains.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
K. von Arx, Qisi Wang, S. Mustafi, D. G. Mazzone, M. Horio, D. John Mukkattukavil, E. Pomjakushina, S. Pyon, T. Takayama, H. Takagi, T. Kurosawa, N. Momono, M. Oda, N. B. Brookes, D. Betto, W. Zhang, T. C. Asmara, Y. Tseng, T. Schmitt, Y. Sassa, J. Chang
Summary: In high-temperature cuprate superconductors, the stripe order evolution across optimal doping remains controversial. This study investigates weak charge correlations in La2-xSrxCuO4 and La1.8-xEu0.2SrxCuO4 using resonant inelastic X-ray scattering. The results reveal temperature-dependent long-range stripe order only below optimal doping, while temperature-independent short-range correlations exist at higher doping, suggesting an unresolved electron-phonon coupling origin.
NPJ QUANTUM MATERIALS
(2023)
Article
Chemistry, Physical
Igor Plokhikh, Oscar Fabelo, Lilian Prodan, Michael Worle, Ekaterina Pomjakushina, Antonio Cervellino, Vladimir Tsurkan, Istvan Kezsmaerki, Oksana Zaharko
Summary: In this study, the properties of GdSb0.71Te1.22 are investigated through bulk magnetization measurements, single-crystal and powder synchrotron X-ray diffraction, as well as single-crystal hot-neutron diffraction. It is found that GdSb0.71Te1.22 exhibits a weak orthorhombic distortion and a charge density wave with incommensurate modulations. The magnetic structure is modulated with two propagation vectors, one of which persists up to the paramagnetic transition and the other disappears above an intermediate magnetic transition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Correction
Multidisciplinary Sciences
Christopher Klose, Felix Buttner, Wen Hu, Claudio Mazzoli, Kai Litzius, Riccardo Battistelli, Sergey Zayko, Ivan Lemesh, Jason M. M. Bartell, Mantao Huang, Christian M. Guenther, Michael Schneider, Andi Barbour, Stuart B. B. Wilkins, Geoffrey S. D. Beach, Stefan Eisebitt, Bastian Pfau
Article
Multidisciplinary Sciences
Hiroki Ueda, Mirian Garcia-Fernandez, Stefano Agrestini, Carl P. Romao, Jeroen van den Brink, Nicola A. Spaldin, Ke-Jin Zhou, Urs Staub
Summary: The concept of chirality plays a crucial role in various natural phenomena. Recent studies in condensed matter physics have revealed the existence of chiral fermions and their connection to emergent phenomena and topology. However, experimental verification of chiral phonons in macroscopic systems remains challenging. In this study, we provide experimental evidence of chiral phonons using resonant inelastic X-ray scattering with circularly polarized X-rays. By studying the chiral material quartz, we demonstrate that circularly polarized X-rays couple to chiral phonons at specific positions in reciprocal space, allowing for the determination of the chiral dispersion of lattice modes. This experimental proof of chiral phonons introduces a new degree of freedom in condensed matter physics, with both fundamental importance and potential for exploring novel emergent phenomena based on chiral bosons.
Review
Physics, Multidisciplinary
Petr Adamus, Bing Xu, Premysl Marsik, Adam Dubroka, Paulina Barabasova, Hana Ruzickova, Pascal Puphal, Ekaterina Pomjakushina, Jeffery L. Tallon, Yves-Laurent Mathis, Dominik Munzar, Christian Bernhard
Summary: This study compares the phonon anomalies and electronic gap features in two weakly coupled two-leg-ladder systems (SCCO and YBCO) using experimental and theoretical methods. Results show that the a-axis conductivity in SCCO is similar to the c-axis conductivity in YBCO, and the c-axis conductivity in SCCO is strikingly similar to the in-plane conductivity in YBCO. These findings suggest that collective degrees of freedom play a significant role in the low-energy response of underdoped high-T (c) cuprates, and indicate the formation of quasi-one-dimensional structures similar to two-leg ladders in the CuO2 planes.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Multidisciplinary Sciences
E. Garlatti, A. Albino, S. Chicco, V. H. A. Nguyen, F. Santanni, L. Paolasini, C. Mazzoli, R. Caciuffo, F. Totti, P. Santini, R. Sessoli, A. Lunghi, S. Carretta
Summary: Understanding phonon-induced relaxation in molecular qubits is crucial for their application potential. Garlatti et al. utilize inelastic X-ray scattering and density functional theory to investigate the role of low-energy phonons on spin relaxation in a prototypical molecular qubit. They find that intra-molecular vibrations with very-low energies are largely responsible for spin relaxation up to ambient temperature. This research provides insights into improving spin coherence and opens new avenues for the investigation of magnetic molecules for quantum devices.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Hebatalla Elnaggar, Abhishek Nag, Maurits W. Haverkort, Mirian Garcia-Fernandez, Andrew Walters, Ru-Pan Wang, Ke-Jin Zhou, Frank de Groot
Summary: In this study, the observation of triple-magnon excitation in alpha-Fe2O3 challenges the conventional wisdom that only 1- and 2-magnon excitations are possible in a resonant inelastic X-ray scattering experiment. The researchers demonstrate how a two-photon scattering process can generate exotic higher-rank magnons and discuss the relevance of these quasiparticles for magnon-based applications.
NATURE COMMUNICATIONS
(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
Chemistry, Multidisciplinary
Jaewon Choi, Jiemin Li, Abhishek Nag, Jonathan Pelliciari, Hannah Robarts, Charles C. Tam, Andrew Walters, Stefano Agrestini, Mirian Garcia-Fernandez, Dongjoon Song, Hiroshi Eisaki, Steve Johnston, Riccardo Comin, Hong Ding, Ke-Jin Zhou
Summary: This study reveals the spatial symmetry of charge density waves (CDWs) in copper-oxide superconductors using high-resolution resonant inelastic x-ray scattering. The experimental results show anisotropic CDW peaks with elliptical shapes in Bi2Sr2-xLaxCuO6+δ, interpreted as evidence of unidirectional charge stripes. This work provides new insights into the symmetry and microscopic description of CDWs in copper-oxide superconductors.
ADVANCED MATERIALS
(2023)
Proceedings Paper
Physics, Applied
Yuqing Ge, Daniel Andreica, Yasmine Sassa, Elisabetta Nocerino, Ekaterina Pomjakushina, Rustem Khasanov, Henrik M. Ronnow, Martin Mansson, Ola Kenji Forslund
Summary: A Muon Spin Rotation (mu+SR) study was conducted to investigate the magnetic properties of SrCu2(BO3)(2) (SCBO) as a function of temperature/pressure. Measurements in zero field and transverse field confirm that there is no long range magnetic order at high pressures and low temperatures. The observed changes in the Cu spin fluctuations, above 21 kbar, suggest the formation of a plaquette phase, consistent with previous inelastic neutron scattering measurements. SCBO, being the only known realization of the Shatry-Sutherland model, likely has a plaquette state as its ground state mediating the dimer and antiferromagnetic phase.
15TH INTERNATIONAL CONFERENCE ON MUON SPIN ROTATION, RELAXATION AND RESONANCE
(2023)
Article
Nanoscience & Nanotechnology
Chiara Ricca, Elizabeth Skoropata, Marta D. Rossell, Rolf Erni, Urs Staub, Ulrich Aschauer
Summary: A highly ordered Moire dislocation lattice has been discovered recently, and the structure and defect chemistry of these dislocations have been investigated through experimental characterization and computational calculations. The results show the presence of undercoordinated light metal cations and oxygen vacancies at the dislocation cores, which may affect the properties of complex multifunctional heterostructures and result in the reduction of Ti ions through electron doping.
ACS APPLIED MATERIALS & INTERFACES
(2023)
