Article
Chemistry, Multidisciplinary
Shunhua Hu, Wei Liu, Lidan Guo, Rui Zhang, Xianrong Gu, Ke Meng, Yang Qin, Ankang Guo, Tingting Yang, Cheng Zhang, Xueli Yang, Shuhang Lu, Meng Wu, Kun Lu, Ting Tan, Erjun Zhou, Zhixiang Wei, Xiangnan Sun
Summary: In this study, an innovative spin-filtering-competition mechanism is proposed to continuously modulate the interfacial effect in molecular spin valves at room temperature. By precisely controlling lithium fluoride coverage on the cobalt surface, continuous modulation of the spin-injection process can be successfully achieved, allowing active control of spin polarization of the injected current and magnetoresistance effect.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Nicolas Montenegro-Pohlhammer, Rocio Sanchez-de-Armas, Carmen J. Calzado, Merlys Borges-Martinez, Gloria Cardenas-Jiron
Summary: The study demonstrates that NiTP-PAPy strongly adsorbs on the Au(111) surface in both high spin and low spin configurations, and the photoinduced switching is preserved upon adsorption. DFT-NEGF calculations indicate that the current passing through the molecular junction-like systems is much higher in the high spin configuration, and the current in the ferromagnetic junction is highly spin-polarized.
DALTON TRANSACTIONS
(2021)
Article
Nanoscience & Nanotechnology
Manoj Kumar Rajbhar, Sandip De, Gopal Sanyal, Avijit Kumar, Brahmananda Chakraborty, Shyamal Chatterjee
Summary: Recent studies have shown that nanostructured MoS2 has promising performance in detecting reducing gases like ammonia (NH3). However, the pristine material has limitations in terms of response, recovery, and repeatability. In this work, defect engineering of 3D nanostructured MoS2 induced by a low energy ion beam is demonstrated to significantly improve the sensing performance of NH3 compared to the as-prepared material. The ion beam-modified MoS2 exhibits higher electrical conductivity and water-repelling nature, which complement each other for better sensing performance.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
P. Huillery, J. Leibold, T. Delord, L. Nicolas, J. Achard, A. Tallaire, G. Hetet
Summary: This study demonstrates the efficient transfer of electron spins to nuclear spins in NV centers under ambient conditions with uncritical magnetic field angles. This technique has the potential to enhance the sensitivity of NV sensors and could be utilized for long-lived storage of microwave photons and coupling nuclear spins to mechanical oscillators in the resolved sideband regime.
Article
Multidisciplinary Sciences
Young-Hoon Kim, Yaxin Zhai, Haipeng Lu, Xin Pan, Chuanxiao Xiao, E. Ashley Gaulding, Steven P. Harvey, Joseph J. Berry, Zeev Valy Vardeny, Joseph M. Luther, Matthew C. Beard
Summary: Traditional optoelectronic approaches rely on both electrical and magnetic fields to control spin, charge, and light, while the use of chiral-induced spin selectivity (CISS) technology allows for the fabrication of a spin-LED that operates at room temperature without the need for magnetic fields or ferromagnetic contacts.
Article
Multidisciplinary Sciences
Lujin Min, Hengxin Tan, Zhijian Xie, Leixin Miao, Ruoxi Zhang, Seng Huat Lee, Venkatraman Gopalan, Chao-Xing Liu, Nasim Alem, Binghai Yan, Zhiqiang Mao
Summary: The nonlinear Hall effect (NLHE) is a new type of Hall effect with wide application prospects. Previous NLHEs have mostly been observed at low temperatures, but researchers have discovered a strong bulk NLHE at room temperature in BaMnSb2 material. This finding opens up new possibilities for wireless microwave detection and frequency doubling.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Harpreet Singh, Andrei N. Anisimov, Ilia D. Breev, Pavel G. Baranov, Dieter Suter
Summary: This study focuses on the optical alignment of the spin 3/2 negatively charged silicon vacancy in 6H-SiC. By using time-resolved optically detected magnetic resonance, the researchers were able to control the silicon vacancy spin ensemble and measure various properties. Additionally, a rate equation model was developed to explain the observed behavior and determine relevant rate constants for the optical initialization process of the silicon vacancy spin ensemble.
Article
Physics, Applied
Li-Da Chen, Li-Huai Shu, Bi Hui Zhang, Lin Liu, Lin Lei, Ye Shao, Feng-Zhen Huang, Yang-Yang Lv, Zhen-Xiang Cheng, Jian-Li Wang, G. A. Stewart, J. M. Cadogan, W. D. Hutchison, Jian Zhou, Xiao Qiang Liu, Shu-Hua Yao, Y. B. Chen, Yan-Feng Chen
Summary: We grew (Sr, Ca) Nd2Fe2O7 single crystals with the Ruddlesden-Popper structure using an optical floating-zone method. A significantly anisotropic magneto-dielectric effect (MD) was observed in a SrNd2Fe2O7 crystal at room temperature, with ab-plane and c-axial MD coefficients reaching -12.3% and -8.4% in a 1 T magnetic field. The anisotropic MD effect decreased with an increase in Ca concentration and eventually disappeared. The anisotropic MD effect in SrNd2Fe2O7 crystals can be attributed to polaronic hopping between neighboring Fe3+ ions through oxygen vacancies in an anisotropically antiferromagnetic matrix.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jingdi Lu, Liang Si, Qinghua Zhang, Chengfeng Tian, Xin Liu, Chuangye Song, Shouzhe Dong, Jie Wang, Sheng Cheng, Lili Qu, Kexuan Zhang, Youguo Shi, Houbing Huang, Tao Zhu, Wenbo Mi, Zhicheng Zhong, Lin Gu, Karsten Held, Lingfei Wang, Jinxing Zhang
Summary: This study demonstrates the successful construction of a sharp interface with significant Dzyaloshinskii-Moriya interaction in spin-orbit-coupled transition-metal oxides through atomic design of defective interfaces. The interfacial inversion-symmetry breaking allows for reversible manipulation of the topological spin texture, leading to deterministic ON and OFF switching of the topological Hall signal. These defect-engineered topological spin textures may hold promise for future skyrmion-based memristor and synaptic devices.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Hamas Tahir, Naresh Eedugurala, Sheng-Ning Hsu, Paramasivam Mahalingavelar, Brett M. Savoie, Bryan W. Boudouris, Jason D. Azoulay
Summary: Open-shell conjugated polymers (CPs) offer new opportunities for emerging technologies due to their unique electronic and spin structures. In this study, the connections between molecular, electronic, and solid-state transport in a high-spin donor-acceptor CP were investigated. It was found that a giant negative magnetoresistance (MR) was achieved in the CP thin-film device at low temperatures, surpassing the performance of all other organic materials. As the temperature increased, the negative MR decreased and became positive, which correlated with the electronic and spin structure of the CP.
ADVANCED MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Yichen Liu, Yue Wang, Xing Fu, Qiuxing Li, Wenli Wang, Changwei Hu
Summary: Room temperature pretreatment of pubescens with soaking in MgCl2 aqueous solution at different concentrations resulted in higher conversion rates of hemicellulose and lignin with 20 wt% MgCl2 solution. MgCl2 pretreatment may change the dissolution conversion mechanism of pubescens and promote the breakage of ether linkage, leading to the formation of a new monophenol. Furthermore, GPC analysis revealed a decrease in larger compounds and an increase in smaller compounds compared to pure water pretreatment.
Article
Chemistry, Physical
Eugene B. Yakimov, Pavel S. Vergeles, Alexander Y. Polyakov, Ivan Shchemerov, A. Chernyh, A. A. Vasilev, A. Kochkova, In-Hwan Lee, S. J. Pearton
Summary: By scratching the surface of n-GaN films, dislocations were introduced and observed to propagate along the <11-20> directions forming a region with high dislocation density. This region exhibited a decrease in intensity of bandedge cathodoluminescence band at 368 nm, an emergence of the dislocation-related band at 400 nm wavelength, and an increase in intensity of the yellow CL band related to defects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Chih-Hung Ko, Qirong Zhu, Francesco Tassinari, George Bullard, Peng Zhang, David N. Beratan, Ron Naaman, Michael J. Therien
Summary: A critical challenge in spintronics is to develop molecular wires that can efficiently generate spin-polarized currents. By using chiral binucleating ligands to induce interplanar torsional twisting in highly conjugated molecular wires, the rotational strengths in the near-infrared region are significantly enhanced. The large scalar product of electric and magnetic dipole transition moments in the low-energy absorptive manifolds of these wires enables enhanced chirality-induced spin selectivity and spin polarization. Experimental results from magnetic-conductive atomic force microscopy and spin-Hall devices demonstrate that these designs provide a pathway towards achieving high spin selectivity and large-magnitude spin currents in chiral materials.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Y. Venkateswara, Jadupati Nag, S. Shanmukharao Samatham, Akhilesh Kumar Patel, P. D. Babu, Manoj Raama Varma, Jayita Nayak, K. G. Suresh, Aftab Alam
Summary: FeRhCrSi is a new class of spintronic materials that exhibit a band gap in one spin channel while showing a semimetallic feature in the other, allowing for tunable spin transport. Experimental verification of spin semimetallic behavior in FeRhCrSi is presented, confirming the presence of asymmetric magnetoresistance, anomalous conductivity, and long-range ferrimagnetic ordering. Ab initio simulation explains the origin of the low saturation moment and confirms the spin semimetallic feature observed experimentally.
Article
Chemistry, Physical
Jiawei Luo, Jingchao Zhang, Zhaoxin Guo, Zhedong Liu, Shuming Dou, Wei-Di Liu, Yanan Chen, Wenbin Hu
Summary: This study reveals that high-temperature shock can convert spent graphite into defect-rich recycled graphite, which is ideal for high-rate anodes and exhibits higher charging capacity than commercial graphite. The recovery of layered structure and remaining defects during ultrafast heating and cooling process reduce strain energy, accelerate phase transition, and improve Li+ diffusion in recycled graphite. This research provides a facile strategy to guide the re-graphitization of spent graphite and design high-performance battery electrode materials through defect engineering at the atomic level.
Article
Physics, Multidisciplinary
Y. Q. Huang, J. Beyer, Y. Puttisong, I. A. Buyanova, W. M. Chen
Summary: This experimental study demonstrates the profound impact of Fano resonance on the spin properties in semiconductor nanostructures, showing that spin generation can be completely quenched under certain conditions. The findings suggest that spin-dependent Fano resonance acts as a universal spin loss channel in quantum-dot systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Kai Xu, Tero-Petri Ruoko, Morteza Shokrani, Dorothea Scheunemann, Hassan Abdalla, Hengda Sun, Chi-Yuan Yang, Yuttapoom Puttisong, Nagesh B. Kolhe, Jose Silvestre Mendoza Figueroa, Jonas O. Pedersen, Thomas Ederth, Weimin M. Chen, Magnus Berggren, Samson A. Jenekhe, Daniele Fazzi, Martijn Kemerink, Simone Fabiano
Summary: The polarity change of the Seebeck coefficient in highly doped polymers is found to be the result of filling and opening of a hard Coulomb gap in the density of states. The formation of multiply charged species and the opening of this hard Coulomb gap are responsible for the inversion of the Seebeck coefficient and the decrease in electrical conductivity. These findings have implications for the molecular design of next-generation conjugated polymers.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Correction
Multidisciplinary Sciences
Chi-Yuan Yang, Marc-Antoine Stoeckel, Tero-Petri Ruoko, Han-Yan Wu, Xianjie Liu, Nagesh B. Kolhe, Ziang Wu, Yuttapoom Puttisong, Chiara Musumeci, Matteo Massetti, Hengda Sun, Kai Xu, Deyu Tu, Weimin M. Chen, Han Young Woo, Mats Fahlman, Samson A. Jenekhe, Magnus Berggren, Simone Fabiano
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Mattias Jansson, Fumitaro Ishikawa, Weimin M. Chen, Irina A. Buyanova
Summary: This study demonstrates the significant enhancement of energy upconversion efficiency in semiconductor nanowires through the design of core/shell heterostructures. The efficiency is increased by 500 times compared to the constituent materials, even under low excitation power.
Article
Multidisciplinary Sciences
Tiankai Zhang, Feng Wang, Hak-Beom Kim, In-Woo Choi, Chuanfei Wang, Eunkyung Cho, Rafal Konefal, Yuttapoom Puttisong, Kosuke Terado, Libor Kobera, Mengyun Chen, Mei Yang, Sai Bai, Bowen Yang, Jiajia Suo, Shih-Chi Yang, Xianjie Liu, Fan Fu, Hiroyuki Yoshida, Weimin M. Chen, Jiri Brus, Veaceslav Coropceanu, Anders Hagfeldt, Jean-Luc Bredas, Mats Fahlman, Dong Suk Kim, Zhangjun Hu, Feng Gao
Summary: This study proposes a new doping strategy for perovskite solar cells, using stable organic radicals as dopants and ionic salts as doping modulators. The strategy improves the performance and stability of the devices and could inspire further optimization in other optoelectronic devices.
Article
Chemistry, Physical
Bin Zhang, Johan Klarbring, Fuxiang Ji, Sergei Simak, Igor A. Abrikosov, Feng Gao, Galyna Yu Rudko, Weimin M. Chen, Irina A. Buyanova
Summary: Phonon-phonon and electron/exciton-phonon coupling are found to play a vital role in the thermal, electronic, and optical properties of metal halide perovskites. Our study focuses on the evaluation of phonon anharmonicity and coupling between electronic and vibrational excitations in the novel material, Cs2NaFeCl6, through Raman measurements and theoretical calculations. The results highlight the significance of phonon-phonon and electron-phonon interactions in the electronic properties of Cs2NaFeCl6.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Applied
Y. Q. Huang, V Polojarvi, A. Aho, R. Isoaho, T. Hakkarainen, M. Guina, I. A. Buyanova, W. M. Chen
Summary: This study demonstrates the existence of nonlinear spin response in nonmagnetic materials and showcases it in a (Ga, N)As-InAs quantum dot coupled all-semiconductor nanostructure. The observed spin nonlinearity can be conveniently tuned with an external magnetic field and potentially operates at a speed exceeding 1 GHz.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Kaito Nakama, Mitsuki Yukimune, Naohiko Kawasaki, Akio Higo, Satoshi Hiura, Akihiro Murayama, Mattias Jansson, Weimin M. Chen, Irina A. Buyanova, Fumitaro Ishikawa
Summary: This study reports the growth of GaAs/GaInNAs/GaAs core-multishell nanowires with a triple quantum-well structure. The nanowires were grown via selective area plasma-assisted molecular beam epitaxy and exhibited finely controlled structures and targeted nitrogen concentrations.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Fuxiang Ji, Johan Klarbring, Bin Zhang, Feng Wang, Linqin Wang, Xiaohe Miao, Weihua Ning, Muyi Zhang, Xinyi Cai, Babak Bakhit, Martin Magnuson, Xiaoming Ren, Licheng Sun, Mats Fahlman, Irina A. Buyanova, Weimin M. Chen, Sergei I. Simak, Igor A. Abrikosov, Feng Gao
Summary: Lead-free halide double perovskites (HDPs) have been synthesized with remarkable and fully reversible thermochromism. The thermochromism in Cs2NaFeCl6 is attributed to electron-phonon coupling, and it exhibits higher temperature sensitivity compared to lead halide perovskites and conventional semiconductors. The Cs2NaFeCl6 single crystal shows excellent environmental, thermal, and thermochromic cycle stability. This study provides valuable insights and new possibilities for developing efficient thermochromic materials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Bin Zhang, Yuqing Huang, Fuxiang Ji, Xiaohe Miao, Feng Gao, Weimin M. Chen, Irina A. Buyanova
Summary: We report the first observation of second harmonic generation (SHG) from halide double perovskite single crystals. The SHG efficiency of these materials with centrosymmetric crystalline structures is strongly dependent on the measurement temperature, increasing by up to 3 orders of magnitude at low temperatures under light illumination. The enhancement is attributed to the build-up of a light-induced electric field within the near-surface region.
