Article
Physics, Applied
Rui Wu, Andrew Ross, Shilei Ding, Yuxuan Peng, Fangge He, Yi Ren, Romain Lebrun, Yong Wu, Zhen Wang, Jinbo Yang, Arne Brataas, Mathias Klaeui
Summary: In this study, we investigated magnetotransport in heterostructures composed of the van der Waals antiferromagnet CrPS4 and the heavy metals Pt and Pd. The results showed that both types of devices exhibited the spin-flop transition of CrPS4 and a strong anomalous Hall effect. The CrPS4/Pd devices, in particular, demonstrated a more significant enhancement in the anomalous Hall effect at temperatures above 70 K and displayed a topological Hall effect signal, possibly associated with chiral spin structures at the interface.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Ning Jiang, Bo Yang, Yulong Bai, Yaoxiang Jiang, Shifeng Zhao
Summary: Both surface and interface scattering can cause a sign reversal of the anomalous Hall effect in heterostructures, and temperature and cluster size can also lead to sign reversal. An effective method for improving the application of AHE was proposed in this study.
Article
Materials Science, Multidisciplinary
Yi-Xiang Wang, Zhigang Cai
Summary: In this study, the magnetotransport property of ZrTe5 is investigated using a strong topological insulator model. The presence of a deferring effect in the chemical potential is found, which helps distinguish the saddle points of the inverted LLs by fixing the carrier density. Additionally, the features of 3D QHE are demonstrated by fixing chemical potential, and the underlying mechanisms are attributed to the interplay between Dirac fermions, magnetic field, and impurity scatterings.
Article
Multidisciplinary Sciences
Yang Li, Shengnan Xu, Jianfeng Wang, Chong Wang, Baishun Yang, Haiqing Lin, Wenhui Duan, Bing Huang
Summary: The coexistence of the quantum anomalous Hall effect (QAHE) and magnetic skyrmion (SK) can generate a previously unknown SK state called the RK joint topological skyrmion. This state allows tunability of the number and chirality of chiral boundary states (CBS) under external fields, providing additional degrees of freedom for manipulation. Furthermore, external fields can induce a continuous topology phase transition from K-space QAHE to R-space SK, serving as an ideal platform to understand crossover phenomena of multiple-space topologies.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Rajeev Nepal, Vinay Sharma, Lisa Pogue, Natalia Drichko, Ramesh C. Budhani
Summary: This study reports the observation of anisotropic magnetoresistance (AMR) and planar Hall effect (PHE) in polycrystalline thin films of Bi2Te3. Despite the differences in carrier density and mobility compared to epitaxial films and single crystals, similar AMR and PHE were observed in the films, which may be important for scalable production of Bi2Te3 based AMR and PHE sensors.
Article
Materials Science, Multidisciplinary
Jingu Qin, Dazhi Hou, Yao Chen, Eiji Saitoh, Xiaofeng Jin
Summary: The temperature dependence of spin Hall magnetoresistance (SMR) was investigated in Pt/Cr2O3/Y3Fe5O12 structure. The SMR was not observed well below the Neel temperature of Cr2O3, and only a positive SMR was seen near the Neel temperature, tracking the YIG magnetic switching process. The high field magnetoresistance observed up to an external magnetic field of 20000 Oe is attributed to the Hanle magnetoresistance in Pt.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Multidisciplinary Sciences
N. Lebedev, M. Stehno, A. Rana, P. Reith, N. Gauquelin, J. Verbeeck, H. Hilgenkamp, A. Brinkman, J. Aarts
Summary: The study investigated the influence of magnetic ions by measuring intermixed LaAlO3/GdTiO3/SrTiO3 at temperatures below 10 K, finding that AHE might be due to the change in Rashba spin-orbit coupling at the Lifshitz transition. The presence of AHE is attributed to easily polarizable paramagnetic moments at low temperatures and high magnetic fields, rather than clear signs of ferromagnetism.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Abdul-Vakhab Tcakaev, Bastian Rubrecht, Jorge. Facio, Volodymyr. B. Zabolotnyy, Laura. T. Corredor, Laura. C. Folkers, Ekaterina Kochetkova, Thiago R. F. Peixoto, Philipp Kagerer, Simon Heinze, Hendrik Bentmann, Robert. J. Green, Pierluigi Gargiani, Manuel Valvidares, Eugen Weschke, Maurits. W. Haverkort, Friedrich Reinert, Jeroen van den Brink, Bernd Buechner, Anja U. B. Wolter, Anna Isaeva, Vladimir Hinkov
Summary: The recent discovery of the quantum anomalous Hall effect (QAHE) in MnBi2Te4 and MnBi4Te7 indicates the potential of the (MnBi2Te4)(Bi2Te3)(n) family for further improvements in QAHE. The ferromagnetic (FM) ordered MnBi2Te4 septuple layers (SLs) in this family contribute to its promising nature. However, achieving QAHE in MnBi2Te4 and MnBi4Te7 is complicated due to the substantial antiferromagnetic (AFM) coupling between the SLs. By interlacing the SLs with an increasing number of Bi2Te3 quintuple layers (QLs), an FM state advantageous for QAHE can be stabilized. The mechanisms driving the FM state and the number of necessary QLs are not yet understood, and the surface magnetism remains unclear. This study demonstrates robust FM properties in MnBi6Te10 (n = 2) and establishes that its origin lies in the Mn/Bi intermixing phenomenon, thus consolidating its potential for QAHE at elevated temperatures.
Article
Materials Science, Multidisciplinary
Tirthankar Chakraborty, Kartik Samanta, Satya N. Guin, Jonathan Noky, Inigo Robredo, Suchitra Prasad, Juergen Kuebler, Chandra Shekhar, Maia G. Vergniory, Claudia Felser
Summary: Oxide materials have various properties, but experimental evidence of their topological nature is rare. This paper reveals the topological nature of oxide double perovskite Sr2FeMoO6 by investigating its structural, magnetic, and electronic properties. It provides a basis for further exploration and realization of the topological properties of oxide systems.
Article
Materials Science, Multidisciplinary
Runnan Zhang, Ken-ichi Hino, Nobuya Maeshima
Summary: By irradiating Zn3As2 with a resonant continuous-wave laser, two types of Floquet-Weyl semimetal (FWSM) phases are observed, characterized by their spin orientations and corresponding surface states.
Article
Materials Science, Multidisciplinary
N. Sluchanko, A. Azarevich, A. Bogach, S. Demishev, K. Krasikov, V. Voronov, V Filipov, N. Shitsevalova, V Glushkov
Summary: A comprehensive study of magnetoresistance and Hall effect in nonmagnetic metal LuB12 single crystals was conducted, revealing an anomalous positive contribution to Hall effect and its association with magnetoresistance peak. The metal exhibits inhomogeneous distribution of electron density, and various scenarios involving Fermi surface topology, relaxation time of charge carriers, and interaction with external magnetic field and fluctuating charge stripes were analyzed. The origin of SdH oscillations in this nonequilibrium metal with electron phase separation and strong charge carrier scattering was discussed.
Article
Physics, Multidisciplinary
I. N. Yakovkin, N. Petrova
Summary: The study reveals that spin-orbit coupling significantly affects the band structures of heavy IV-VI semiconductors, potentially leading to band inversion for topological insulator formation. However, the absence of surface states providing metallicity in thin films raises doubts about the formation of topological crystalline insulators in IV-VI compounds.
Article
Chemistry, Inorganic & Nuclear
Fan Sun, Haoyu Yue, Danilo Puggioni, Zhongnan Guo, Yutong Li, James M. Rondinelli, Zheng Zhang, Wenxia Yuan, Mercouri G. Kanatzidis
Summary: We present the eutectic polytelluride flux strategy as an excellent method for discovering new niobium subtellurides. By adjusting the ratio of niobium metal to flux in the starting materials, we have successfully synthesized new phases of niobium subtellurides. These subtellurides exhibit diverse niobium clusters, including face-sharing and edge-sharing octahedral columns and zig-zag chains. This synthetic strategy allows for precise control over the structural dimensionality and oxidation state, providing an efficient route to explore quantum materials in transition metal subchalcogenides.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Rafael Barbosa, Danilo Kuritza, Gabriel Perin, R. H. Miwa, R. B. Pontes, J. E. Padilha
Summary: In this study, we investigated the electronic and optical response properties of Janus-like hexagonal monolayer materials of group IV-VI using ab initio calculations. Our results show that some 2D group IV-VI hexagonal materials are dynamically unstable, while the dynamically stable materials exhibit indirect band gaps. We also found that the hexagonal crystal structure plays a crucial role in determining the band gap width and the strength of the exciton binding energy. Additionally, most stable 2D materials showed strong optical absorbance in the visible range, making them promising for ultra-thin-film photovoltaic applications.
PHYSICAL REVIEW MATERIALS
(2023)
Review
Physics, Multidisciplinary
Vladimir Tsurkan, Hans-Albrecht Krug Von Nidda, Joachim Deisenhofer, Peter Lunkenheimer, Alois Loidl
Summary: Spinel compounds exhibit diverse properties, serving technological applications, gemstone purposes, and geological/astronomical studies, while their research contributes significantly to the understanding of magnetism, orbitals, charges, and other related fields.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Eduardo Sergio Oliveros-Mata, Clemens Voigt, Gilbert Santiago Canon Bermudez, Yevhen Zabila, Nestor Miguel Valdez-Garduno, Marco Fritsch, Sindy Mosch, Mihails Kusnezoff, Juergen Fassbender, Mykola Vinnichenko, Denys Makarov
Summary: This study introduces a new type of printed magnetic field sensor that utilizes a nonmagnetic bismuth-based paste and laser sintering. The sensors can be printed on various substrates and exhibit effective operation in high magnetic fields. The research also demonstrates the flexibility and resilience of the sensors when printed on flexible materials.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Xing Huang, Shuai Fu, Cong Lin, Yang Lu, Mingchao Wang, Peng Zhang, Chuanhui Huang, Zichao Li, Zhongquan Liao, Ye Zou, Jian Li, Shengqiang Zhou, Manfred Helm, Petko St. Petkov, Thomas Heine, Mischa Bonn, Hai I. Wang, Xinliang Feng, Renhao Dong
Summary: In this study, a strategy for synthesizing high-mobility semiconducting conjugated coordination polymers (c-CPs) using novel conjugated ligands with D2h symmetry was demonstrated. The reduced symmetry of the 4 + 2 ligands compared to conventional phenyl ligands led to anisotropic coordination in the formation of c-CPs. A single-crystalline three-dimensional (3D) c-CP Cu4DHTTB with orthogonal ribbon-like pi-d conjugated chains was successfully achieved. This c-CP exhibited a small band gap, dispersive energy bands, and high charge carrier mobilities, laying the foundation for high-performance c-CP-based (opto-)electronics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Ruslan Salikhov, Igor Ilyakov, Lukas Koerber, Attila Kakay, Rodolfo A. Gallardo, Alexey Ponomaryov, Jan-Christoph Deinert, Thales V. A. G. de Oliveira, Kilian Lenz, Juergen Fassbender, Stefano Bonetti, Olav Hellwig, Juergen Lindner, Sergey Kovalev
Summary: Engineering of spin-orbit interactions in a magnetic multilayered structure enables the coherent generation of spin waves using terahertz radiation, benefiting spintronic device development. By exploiting relativistic spin-orbit torques confined to metal/ferromagnet interfaces, we improve light-matter interaction and successfully excite spin-wave modes with frequencies up to 0.6 THz and wavelengths as short as 6 nm using broadband terahertz radiation. Our results have broad applicability and offer the potential for nanoscale control of high-frequency signals.
Article
Engineering, Electrical & Electronic
Mao Wang, M. S. Shaikh, U. Kentsch, R. Heller, Shengqiang Zhou
Summary: Single-crystalline Mg-implanted Si layers were synthesized through ion implantation and pulsed laser melting. The Mg doping concentration reached 10(21) cm(-3). Recrystallization of the Mg-implanted Si layer was confirmed by Raman, Rutherford backscattering spectrometry/channeling, and particle-induced x-ray emission measurements. The Mg-implanted Si layers exhibited strong below band gap infrared absorption in the mid-infrared range, which was attributed to deep levels induced by high implantation levels of Mg atoms. This study highlights the potential of Mg-implanted Si for room-temperature light detection in a broad infrared range for Si-based photonics.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Vadym Iurchuk, Javier Pablo-Navarro, Tobias Hula, Ryszard Narkowicz, Gregor Hlawacek, Lukas Koerber, Attila Kakay, Helmut Schultheiss, Juergen Fassbender, Kilian Lenz, Juergen Lindner
Summary: Localized dynamical modes in 1D spin-wave conduits were studied using microresonator ferromagnetic resonance technique. By trimming the edges of the microstrip and creating nano gaps, additional resonances emerged, which were attributed to modes localized at the inner edges of the strips. Micromagnetic simulations confirmed the localization of the lowest-energy modes and their tunability by changing the spatial separation between the microstrips.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Yi Li, Juanmei Duan, Yonder Berencen, Rene Hubner, Hsu-Sheng Tsai, Chia-Nung Kuo, Chin Shan Lue, Manfred Helm, Shengqiang Zhou, Slawomir Prucnal
Summary: In this work, we fabricated vertical p-n heterojunctions made of p-type tin monoselenide (SnSe) and n-type tin diselenide (SnSe2) through NH3 plasma-assisted phase transformation. Optimal plasma parameters were determined for the full transformation of SnSe2 into SnSe within a few seconds. The crystal quality and topography of the heterostructures were characterized using micro-Raman spectroscopy and transmission electron microscopy, and the formation of a p-n junction was confirmed through current-voltage measurements.
NANOSCALE ADVANCES
(2023)
Article
Multidisciplinary Sciences
Oleksii M. Volkov, Daniel Wolf, Oleksandr V. Pylypovskyi, Attila Kakay, Denis D. Sheka, Bernd Buechner, Juergen Fassbender, Axel Lubk, Denys Makarov
Summary: Chiral effects originate from the lack of inversion symmetry within the lattice unit cell or sample's shape. Being mapped onto magnetic ordering, chirality enables topologically non-trivial textures with a given handedness. In this study, the existence of a static 3D texture characterized by two magnetochiral parameters, magnetic helicity of the vortex and geometrical chirality of the core string, is demonstrated in a geometrically curved asymmetric permalloy cap.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Yongjian Luo, Changan Wang, Chao Chen, Yuan Gao, Fei Sun, Caiwen Li, Xiaozhe Yin, Chunlai Luo, Ulrich Kentsch, Xiangbin Cai, Mei Bai, Zhen Fan, Minghui Qin, Min Zeng, Jiyan Dai, Guofu Zhou, Xubing Lu, Xiaojie Lou, Shengqiang Zhou, Xingsen Gao, Deyang Chen, Jun-Ming Liu
Summary: In order to enhance energy storage density, both maximum polarization (P-max) and breakdown strength (E-b) need to be improved, even though they are inversely correlated. This study achieved order-disorder transition induced polar nanoregions in PbZrO3 thin films through low-energy ion implantation, overcoming the tradeoff between high polarizability and breakdown strength. This resulted in a tripling of the energy storage density from 20.5 to 62.3 J/cm(3) and a significant enhancement of breakdown strength. This approach can be extended to other dielectric oxides to improve energy storage performance and tailor oxide functionalities.
APPLIED PHYSICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Diana Isabel Sandoval Bojorquez, Zeljko Janicijevic, Brenda Palestina Romero, Eduardo Sergio Oliveros Mata, Markus Laube, Anja Feldmann, Alexandra Kegler, Laura Drewitz, Ciaran Fowley, Jens Pietzsch, Juergen Fassbender, Torsten Tonn, Michael Bachmann, Larysa Baraban
Summary: Detection of COVID-19-associated antigens and respective antibodies is achieved using an interdigitated gold nanowire-based impedance nanobiosensor. The sensor devices demonstrate high sensitivity and a low limit of detection for the antibodies and virus antigen. Clinical plasma samples analysis shows the applicability of this platform in determining the infection or immunity status of patients.
Article
Chemistry, Multidisciplinary
Mingchao Wang, Gang Wang, Chandrasekhar Naisa, Yubin Fu, Sai Manoj Gali, Silvia Paasch, Mao Wang, Haiko Wittkaemper, Christian Papp, Eike Brunner, Shengqiang Zhou, David Beljonne, Hans-Peter Steinrueck, Renhao Dong, Xinliang Feng
Summary: The study reports a 2D c-COF electrode material that can store protons rapidly in mild aqueous electrolyte and strong acid. The unique proton affinity mechanism of the 2D c-COF is revealed, and the outstanding rate capability is demonstrated.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
Moritz Hoesch, Olena Fedchenko, Mao Wang, Christoph Schlueter, Dmitrii Potorochin, Katerina Medjanik, Sergey Babenkov, Anca S. Ciobanu, Aimo Winkelmann, Hans-Joachim Elmers, Shengqiang Zhou, Manfred Helm, Gerd Schoenhense
Summary: Multiple dopant configurations of Te impurities in silicon are investigated using various techniques. Strong chemical core level shifts distinguish these configurations from isolated impurities. Multi-Te configurations, such as dimers or Te ions surrounding a vacancy, are clearly identified. The results contribute to understanding the exceptional activation of free charge carriers in hyperdoping of chalcogens in silicon.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Juanmei Duan, Maciej O. Liedke, Wojciech Dawidowski, Rang Li, Maik Butterling, Eric Hirschmann, Andreas Wagner, Mao Wang, Lawrence Boyu Young, Yen-Hsun Glen Lin, Minghwei Hong, Manfred Helm, Shengqiang Zhou, Slawomir Prucnal
Summary: In this study, the effect of intense pulsed light melting on defect distribution and activation efficiency in chalcogenide-implanted GaAs was investigated. The results showed that after nanosecond pulsed light melting, the main defects in heavily doped GaAs are gallium vacancies decorated with chalcogenide atoms substituting As.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Lukas Koerber, Christopher Heins, Tobias Hula, Joo-Von Kim, Sonia Thlang, Helmut Schultheiss, Juergen Fassbender, Katrin Schultheiss
Summary: Magnons are elementary excitations in magnetic materials that can undergo nonlinear multimode scattering processes. By harnessing the interaction between magnon modes, pattern recognition can be achieved. Experimental results show that different azimuthal modes can be excited through three-magnon scattering, with amplitude dependent on the input sequences. Recognition rates as high as 99.4% can be achieved for four-symbol sequences using scattered modes, even in the presence of amplitude noise.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xing Huang, Shuai Fu, Cong Lin, Yang Lu, Mingchao Wang, Peng Zhang, Chuanhui Huang, Zichao Li, Zhongquan Liao, Ye Zou, Jian Li, Shengqiang Zhou, Manfred Helm, Petko St Petkov, Thomas Heine, Mischa Bonn, Hai I. Wang, Xinliang Feng, Renhao Dong
Summary: This study demonstrates a strategy for synthesizing high-mobility semiconducting coordination polymers (c-CPs) using novel conjugated ligands with reduced symmetry. The synthesized c-CPs exhibit a small band gap, dispersive energy bands, and high charge carrier mobilities, outperforming previously reported conductive coordination polymers. This molecular design strategy lays the foundation for achieving high-performance c-CP-based (opto-)electronics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Geochemistry & Geophysics
Asim Siddique, Peter Boelens, Fangchao Long, Shengqiang Zhou, Veerle Cnudde, Thomas Leissner
Summary: Magnetic separation plays a crucial role in mineral processing and recycling industries. This study proposes a methodology to comprehensively characterize and classify Waste Electrical and Electronic Equipment (WEEE) slag, aiming to establish the connection between slag properties and the separation process. The methodology involves sieving, classification based on magnetic susceptibility, and mineral liberation analysis. This in-depth analysis provides insights into the separation behavior of different slag phases, contributing to the development of predictive separation models.
