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SSRN 2022年

作者： Shen, Liao Xu, Chengjie Gao, Jingguo Tao, Jianming Wang, Chundong Chen, Yue Lin, Yingbin Huang, Zhigao Li, Jiaxin College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center Fujian Normal University Fuzhou350117 China Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou350117 China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou350117 China School of Optical and Electronic Information Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China

At present, developing a simple strategy to effectively solve the shackles of volume expansion, poor conductivity and interface compatibility faced by Si-C anode in lithium batteries (LIBs) is the key to its commercialization. Here, low-cost nano-Si powders were prepared from Si-waste of solar-cells by sanding treatment, which can effectively reduce the commercialization cost for Si-C anode. Furthermore, micro-nano structural materials of Gr@Si/C/TiO2, with graphite as the inner core, TiO2-doped and carbon-coated Si as the outer coating-layer, were synthesized, realizing single batch kilogram-scale preparation. Herein, for the Gr@Si/C/TiO2 anodes, TiO2-doped carbon layer can effectively improve its conductivity, reduce electrode polarization, improve the e- and Li+ transport dynamics, and improve the interface compatibility with electrolyte. Accordingly, Gr@Si/C/TiO2 composites can output excellent LIB performance, especially with high initial Coulombic efficiency (ICE) of 82.51% and large average reversible capacity of ~810 mAh g−1 at 0.8 A g−1 after 1000 cycles. Moreover, Gr@Si/C/TiO2 303450-prototype pouch full cells assembled with LiNi0.8Co0.1Mn0.1O2 (NCM811) as cathode, deliver impressive energy density of ~489.3 Wh kg-1 based on the total weight of active materials, and stable cycling performance with an average capacity of ~300 mAh after 270 cycles at 1.0 C, suggesting its promising application in the high energy-density LIBs. © 2022, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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highly Sensitive Photomultiplication Type Polymer Photodetectors by Manipulating Interfacial Trapped Electron Density

SSRN

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SSRN 2022年

作者： Yang, Kaixuan Wang, Jian Zhao, Zijin Sun, Yupeng Liu, Ming Zhou, Zhengji Zhang, Xiaoli Zhang, Fujun Key Laboratory of Luminescence and Optical Information Ministry of Education Beijing Jiaotong University Beijing100044 China College of Physics and Electronic Engineering Taishan University Taian271000 China Key Lab for Special Functional Materials Ministry of Education National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology School of Materials Henan University Kaifeng475004 China State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials School of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China

Photomultiplication type polymer photodetectors (PM-PPDs) are successfully achieved via interfacial trap-assisted hole tunneling injection from external circuit. The external quantum efficiency (EQE) spectra of PM-PPDs strongly depend on the trapped electron density near electrode, as confirmed from the calculated and experimental results. The trapped electron density near Al electrode can be increased by decreasing the thickness of active layers, which also makes the PM-PPDs vulnerable to breakdown. A smart strategy with wide bandgap polymer poly-TPD as buffer layer is proposed to obtain large EQE values, also keeping excellent withstanding large bias characteristic of PM-PPDs. The optimal double layered ternary PM-PPDs were obtained with poly-TPD (40 nm)/P3HT:PBDB-T:PC61BM (80:20:2, wt/wt/wt) (90 nm) as active layers, exhibiting a rather large EQE value of 21400% and specific detectivity of 1.7×1013 Jones at 430 nm under -8 V bias. This work indicates that inserting wide bandgap and high hole mobility material as buffer layer should be an efficient strategy to prepare highly sensitive PM-PPDs, benefiting from the increased interfacial trapped electron density and efficient hole transport. © 2022, The Authors. All rights reserved.

关键词： Photons

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15.28% Efficiency of Conventional Layer-by-Layer All-Polymer Solar Cells Superior to Bulk Heterojunction or Inverted Cells

SSRN

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SSRN 2022年

作者： Liu, Zhongyuan Ma, Xiaoling Xu, Wenjing Zhang, Shuping Xu, Chunyu Jeong, Sang Young Woo, Han Young Zhou, Zhengji Zhang, Fujun Key Laboratory of Luminescence and Optical Information Ministry of Education Beijing Jiaotong University Beijing100044 China Organic Optoelectronic Materials Laboratory Department of Chemistry College of Science Korea University Seoul02841 Korea Republic of Key Laboratory for Special Functional Materials Ministry of Education National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology School of Materials Henan University Kaifeng475004 China

Series of conventional and inverted all-polymer solar cells (APSCs) were prepared with polymer PM6 as donor and polymer PYF-T-o as acceptor based on layer-by-layer (LbL) or bulk heterojunction (BHJ) structure. The power conversion efficiency (PCE) of 15.28% and 14.97% can be achieved in conventional LbL and BHJ APSCs, respectively. The relatively high PCE of conventional LbL APSCs is mainly originated from short circuit current density (JSC) improvement caused by optimized phase separation and more ordered molecular arrangement for efficient charge extraction and transport in layered active layers. Meanwhile, the efficient energy transfer from PM6 to PYF-T-o should provide an additional exciton utilization channel, which is also responsible for relatively high performance in conventional LbL APSCs. It is worth noting that the inverted APSCs exhibit low PCE as compared to that of corresponding conventional APSCs, especially for the inverted LbL APSCs with only 8.54% PCE. The markedly inferior PCE in inverted LbL APSCs is mainly attributed to the insufficient PYF-T-o exciton dissociation, which can be demonstrated from the greatly low EQE spectra in long wavelength region as compared to that of other type APSCs. This work provides more deep insight on the dynamic process in LbL active layers, which should contribute to the construction of highly efficient APSCs based on LbL processing method. © 2022, The Authors. All rights reserved.

关键词： Phase separation

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Asymmetrically Contacted Tellurium Short-Wave Infrared Photodetector with Low Dark Current and high Sensitivity at Room Temperature

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Advanced optical materials 2023年第23期11卷

作者： Wang, Huide Huang, Haoxin Zha, Jiajia Xia, Yunpeng Yang, Peng Zeng, Yonghong Liu, Yi Cao, Rui Wang, Bing Wang, Wei Zheng, Long Chen, Ye He, Qiyuan Chen, Xing Jiang, Ke Lin, Ja-Hon Shi, Zhe Ho, Johnny C. Zhang, Han Tan, Chaoliang Department of Materials Science and Engineering City University of Hong Kong 9990777 Hong Kong International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Interdisciplinary Center of High Magnetic Field Physics of Shenzhen University College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Department of Electrical Engineering City University of Hong Kong 999077 Hong Kong College of Integrated Circuits and Optoelectronic Chips Shenzhen Technology University Shenzhen518118 China Department of Chemistry The Chinese University of Hong Kong 999077 Hong Kong College of Mathematics and Physics Chengdu University of Technology Chengdu610041 China State Key Laboratory of Luminescence and Applications Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China Advanced Nanophotonics Technology Laboratory Department of Electro-Optical Engineering National Taipei University of Technology Taipei10608 Taiwan School of Physics & New Energy Xuzhou University of Technology Xuzhou221018 China Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road 999077 Hong Kong

Large dark current at room temperature has long been the major bottleneck that impedes the development of high-performance infrared photodetectors toward miniaturization and integration. Although infrared photodetectors based on layered 2D narrow bandgap semiconductors have shown admirable advantages compared with those based on conventional compounds, which typically suffer from the expensive cryogenic operation, it is still urgent to develop a simple but effective strategy to further reduce the dark current. Herein, a tellurium (Te)-based infrared photodetector is reported with specifically designed asymmetric electrical contact area. The deliberately introduced asymmetric electrical contact raises the electric field intensity difference in the Te channel near the drain and the source electrodes, resulting in the spontaneous asymmetric carrier diffusion under global infrared light illumination under zero bias. Specifically, the Te-based photodetector presents promising detector performance at room temperature including a low dark current of ≈1 nA, an ultrahigh photocurrent/dark current ratio of 1.57 × 104, a high specific detectivity (D*) of 3.24 × 109 Jones, and a relatively fast response speed of ≈720 µs at zero bias. The results prove that the simple design of asymmetric electrical contact areas can provide a promising solution to high-performance 2D semiconductor-based infrared photodetectors working at room temperature. © 2023 The Authors. Advanced optical materials published by Wiley-VCH GmbH.

关键词： Dark currents

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high-energy,high-repetition-rate ultraviolet pulses from an efficiency-enhanced,frequency-tripled laser

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high Power Laser science and engineering 2021年第3期9卷 27-32页

作者： Xinlin Lu Yujie Peng Wenyu Wang Yuanan Zhao Xiangyu Zhu Yuxin Leng State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

In this study,a high-energy,temporally shaped picosecond ultraviolet(UV)laser running at 100 Hz is demonstrated,with its pulses boosted to 120 mJ by cascaded regenerative and double-pass amplifiers,resulting in a gain of more than 10^(8).With precise manipulation and optimization,the amplified laser pulses were flat-top in the temporal and spatial domains to maintain high filling factors,which significantly improved the conversion efficiency of the subsequent third harmonic generation(THG).Finally,91 mJ,470 ps pulses were obtained at 355 nm,corresponding to a conversion efficiency as high as 76%,which,as far as we are aware of,is the highest THG efficiency for a high-repetition-rate picosecond *** addition,the energy stability of the UV laser is better than 1.07%(root mean square),which makes this laser an attractive source for a variety of fields including laser conditioning and micro-fabrication.

关键词： all-solid-state laser third harmonic generation ultraviolet laser

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Exploring the magnetic properties of individual barcode nanowires using wide-field diamond microscopy

arXiv

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arXiv 2023年

作者： Yoon, Jungbae Moon, Jun Hwan Jeong, Jugyeong Kim, Yu Jin Kim, Kihwan Kang, Hee Seong Jeon, Yoo Sang Oh, Eunsoo Lee, Sun Hwa Han, Kihoon Lee, Dongmin Lee, Chul-Ho Kim, Young Keun Lee, Donghun Department of Physics Korea University Seoul Korea Republic of Department of Materials Science and Engineering Korea University Seoul Korea Republic of Institute for High Technology Materials and Devices Korea University Seoul Korea Republic of KU-KIST Graduate School of Converging Science and Technology Korea University Seoul Korea Republic of Center for Hydrogen∙Fuel Cell Research Korea Institute of Science and Technology Seoul Korea Republic of Ulsan44919 Korea Republic of BK21 Graduate Program Department of Biomedical Sciences Korea University College of Medicine Seoul Korea Republic of Department of Neuroscience Korea University College of Medicine Seoul Korea Republic of Department of Anatomy Korea University College of Medicine Seoul Korea Republic of

Barcode magnetic nanowires typically comprise a multilayer magnetic structure in a single body with more than one segment type. Interestingly, owing to selective functionalization and novel interactions between the layers, barcode magnetic nanowires have attracted significant attention, particularly in the field of bioengineering. However, an analysis of their magnetic properties at the individual nanowire level remains challenging. With this background, herein, we investigated the characterization of magnetic nanowires at room temperature under ambient conditions based on magnetic images obtained via wide-field quantum microscopy with nitrogen-vacancy centers in diamond. Consequently, we could extract critical magnetic properties, such as the saturation magnetization and coercivity, of single nanowires by comparing the experimental results with those of micromagnetic simulations. This study opens up the possibility for a versatile characterization method suited to individual magnetic nanowires. © 2023, CC BY.

关键词： Diamonds

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Quantum critical behavior of the hyperkagome magnet Mn3CoSi

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Physical Review Research 2024年第1期6卷 013144-013144页

作者： Hiroki Yamauchi Dita Puspita Sari Yukio Yasui Terutoshi Sakakura Hiroyuki Kimura Akiko Nakao Takashi Ohhara Takashi Honda Katsuaki Kodama Naoki Igawa Kazutaka Ikeda Kazuki Iida Daichi Ueta Tetsuya Yokoo Matthias D. Frontzek Songxue Chi Jaime A. Fernandez-Baca Kenji M. Kojima Donald Arseneau Gerald Morris Bassam Hitti Yipeng Cai Adam Berlie Isao Watanabe Pai-Tse Hsu Yu-Sheng Chen Min Kai Lee Amelia Elisabeth Hall Geetha Balakrishnan Lieh-Jeng Chang Shin-ichi Shamoto Materials Sciences Research Center Japan Atomic Energy Agency (JAEA) Tokai Ibaraki 319-1195 Japan Innovative Global Program College of Engineering Shibaura Institute of Technology 307 Fukasaku Minuma-ku Saitama City Saitama 337-8570 Japan Meson Science Laboratory RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan School of Science and Technology Meiji University Kawasaki Kanagawa 214-8571 27 Japan Neutron Industrial Technology Center Comprehensive Research Organization for Science and Society (CROSS) Tokai Ibaraki 319-1106 Japan Institute of Multidisciprinary Research for Advanced Materials Tohoku University Sendai 980-8577 Japan Neutron Science and Technology Center Comprehensive Research Organization for Science and Society (CROSS) Tokai Ibaraki 319-1106 Japan J-PARC Center Japan Atomic Energy Agency (JAEA) Tokai Ibaraki 319-1195 Japan Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Neutron Scattering Division Oak Ridge National Laboratory (ORNL) Oak Ridge Tennessee 37831 USA TRIUMF Vancouver British Columbia V6T 2A3 Canada ISIS Neutron and Muon Source Science and Technology Facilities Council Rutherford Appleton Laboratory Didcot OX11 0QX United Kingdom Department of Physics National Cheng Kung University Tainan 70101 Taiwan National Synchrotron Radiation Research Center Hsinchu 300092 Taiwan Department of Physics University of Warwick Coventry CV4 7AL United Kingdom Institute of Physics Academia Sinica Taipei 115201 Taiwan Advanced Science Research Center Japan Atomic Energy Agency (JAEA) Tokai Ibaraki 319-1195 Japan

β-Mn-type family alloys Mn3TX (T=Co, Rh, and Ir; X=Si and Ge) have a three-dimensional antiferromagnetic (AF) corner-shared triangular network, i.e., the hyperkagome lattice. The antiferromagnet Mn3RhSi shows magnetic short-range order over a wide temperature range of approximately 500 K above the Néel temperature TN of 190 K. In this family of compounds, as the lattice parameter decreases, the long-range magnetic ordering temperature decreases. Mn3CoSi has the smallest lattice parameter and the lowest TN in the family. The quantum critical point (QCP) from AF to the quantum paramagnetic state is expected near a cubic lattice parameter of 6.15 Å. Although the Néel temperature of Mn3CoSi is only 140 K, the emergence of the quantum critical behavior in Mn3CoSi is discussed. We study how the magnetic short-range order appears in Mn3CoSi by using neutron scattering, μSR, and bulk characterization such as specific heat capacity. According to the results, the neutron scattering intensity of the magnetic short-range order in Mn3CoSi does not change much at low temperatures from that of Mn3RhSi, although the μSR short-range order temperature of Mn3CoSi is largely suppressed to 240 K from that of Mn3RhSi. Correspondingly, the volume fraction of the magnetic short-range order regions, as shown by the initial asymmetry drop ratio of μSR above TN, also becomes small. Instead, the electronic-specific heat coefficient γ of Mn3CoSi is the largest in this Mn3TSi system, possibly due to the low-energy spin fluctuation near the quantum critical point.

关键词： Critical phenomena Exotic phases of matter Magnetic order Magnetism Phase diagrams Phase transitions Quantum phase transitions

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Low-Temperature Synthesis of Weakly Confined Carbyne inside Single-Walled Carbon Nanotubes

arXiv

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arXiv 2024年

作者： Zhang, Bo-Wen Qiu, Xi-Yang Ma, Yicheng Hu, Qingmei Fitó-Parera, Aina Kohata, Ikuma Feng, Ya Zheng, Yongjia Zhang, Chiyu Matsuo, Yutaka Wang, YuHuang Chiashi, Shohei Otsuka, Keigo Xiang, Rong Levshov, Dmitry I. Cambré, Sofie Wenseleers, Wim Rotkin, Slava V. Maruyama, Shigeo Department of Mechanical Engineering The University of Tokyo Tokyo113-8656 Japan State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou310027 China Theory and Spectroscopy of Molecules and Materials Department of Physics University of Antwerp Antwerp2610 Belgium Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power Engineering Dalian University of Technology Liaoning 116024 China Department of Chemistry and Biochemistry Chemical Physics Program Maryland Nano Center University of Maryland College ParkMD20742 United States Department of Chemical Systems Engineering Graduate School of Engineering Nagoya University Nagoya464-8603 Japan Institute of Materials Innovation Institutes for Future Society Nagoya University Nagoya464-8603 Japan Theory and Spectroscopy of Molecules and Materials Department of Chemistry University of Antwerp Antwerp2610 Belgium Nanostructured and Organic Optical and Electronic Materials Department of Physics University of Antwerp Antwerp2610 Belgium Materials Research Institute Department of Engineering Science & Mechanics The Pennsylvania State University University ParkPA16802 United States

Carbyne, a one-dimensional (1D) carbon allotrope with alternating triple and single bonds, has the highest known mechanical strength but is unstable to bending, limiting synthesis to short linear chains. Encapsulation within carbon nanotubes (CNTs) stabilizes carbyne, forming confined carbyne (CC), thus enabling further research concerning attractive 1D physics and materials properties of carbyne. While CC has been synthesized in multi-walled CNTs (MWCNTs) using the arc-discharge method and in double-walled CNTs (DWCNTs) via high-temperature high-vacuum (HTHV) method, synthesis in single-walled CNTs (SWCNTs) has been challenging due to their fragility under such conditions. In this work, we report a low-temperature method to synthesize CC inside SWCNTs (CC@SWCNT). By annealing SWCNTs containing ammonium deoxycholate (ADC) at 400°C, ADC is converted into CC without damaging the SWCNTs. Raman spectroscopy revealed a strong CC phonon (CC-mode) peak at 1860–1870 cm-1, much stronger than the SWCNT G-band peak, confirming a high fraction of CC in the resulting material. The Raman mapping result showed the uniformity of the CC-mode signal across the entire film sample, proving the high efficiency of this method in synthesizing CC in every SWCNT of appropriate size. Notably, the CC-mode peaks of CC@SWCNT (above 1860 cm-1) are higher than those reported in previous CC@CNT samples (mostly -1). This is attributed to larger SWCNT diameters (>0.95 nm) used in this study, compared to the typical 0.6–0.8 nm range. Larger diameters result in reduced confinement, allowing carbyne to closely resemble free-standing carbyne while remaining stabilized. This low-temperature synthesis of long-chain, nearly freestanding carbyne within large-diameter SWCNTs offers new opportunities for exploring 1D physics and the unique properties of carbyne for potential applications. © 2024, CC BY-NC-ND.

关键词： Single-walled carbon nanotubes (SWCN)

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Observation of the dual quantum spin Hall insulator by density-tuned correlations in a van der Waals monolayer

arXiv

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arXiv 2024年

作者： Tang, Jian Ding, Thomas Siyuan Chen, Hongyu Gao, Anyuan Qian, Tiema Huang, Zumeng Sun, Zhe Han, Xin Strasser, Alex Li, Jiangxu Geiwitz, Michael Shehabeldin, Mohamed Belosevich, Vsevolod Wang, Zihan Wang, Yiping Watanabe, Kenji Taniguchi, Takashi Bell, David C. Wang, Ziqiang Fu, Liang Zhang, Yang Qian, Xiaofeng Burch, Kenneth S. Shi, Youguo Ni, Ni Chang, Guoqing Xu, Su-Yang Ma, Qiong Department of Physics Boston College Chestnut HillMA United States Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Singapore Department of Chemistry and Chemical Biology Harvard University CambridgeMA United States Department of Physics and Astronomy and California NanoSystems Institute University of California Los Angeles Los AngelesCA United States Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing China Department of Materials Science and Engineering Texas A&M University College StationTX United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN United States Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN United States Research Center for Electronic and Optical Materials National Institute for Materials Science Tsukuba Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science Tsukuba Japan Harvard John A. Paulson School of Engineering and Applied Sciences The Center for Nanoscale system Harvard University CambridgeMA United States Department of Physics Massachusetts Institute of Technology CambridgeMA United States CIFAR Azrieli Global Scholars program CIFAR Toronto Canada

The convergence of topology and correlations represents a highly coveted realm in the pursuit of novel quantum states of matter [1, 2]. Introducing electron correlations to a quantum spin Hall (QSH) insulator can lead to the emergence of a fractional topological insulator and other exotic time-reversal-symmetric topological order [3- 10], not possible in quantum Hall and Chern insulator systems. However, the QSH insulator with quantized edge conductance remains rare, let alone that with significant correlations. In this work, we report a novel dual QSH insulator within the intrinsic monolayer crystal of TaIrTe4, arising from the interplay of its single-particle topology and density-tuned electron correlations. At charge neutrality, monolayer TaIrTe4 demonstrates the QSH insulator that aligns with single-particle band structure calculations, manifesting enhanced nonlocal transport and quantized helical edge conductance. Interestingly, upon introducing electrons from charge neutrality, TaIrTe4 only shows metallic behavior in a small range of charge densities but quickly goes into a new insulating state, entirely unexpected based on TaIrTe4's single-particle band structure. This insulating state could arise from a strong electronic instability near the van Hove singularities (VHS), likely leading to a charge density wave (CDW). Remarkably, within this correlated insulating gap, we observe a resurgence of the QSH state, marked by the revival of nonlocal transport and quantized helical edge conduction. Our observation of helical edge conduction in a CDW gap could bridge spin physics and charge orders. The discovery of a dual QSH insulator introduces a new method for creating topological flat minibands via CDW superlattices, which offer a promising platform for exploring time-reversal-symmetric fractional phases and electromagnetism [3-5, 11, 12]. Copyright © 2024, The Authors. All rights reserved.

关键词： Charge density waves

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high-field magnetization of KEr(MoO4)2

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Physical Review B 2024年第2期109卷 024438-024438页

作者： K. Kutko B. Bernáth V. Khrustalyov O. Young H. Engelkamp P. C. M. Christianen L. Prodan Y. Skourski L. V. Pourovskii S. Khmelevskyi D. Kamenskyi B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine (ILTPE) Nauky Avenue 47 Kharkiv 61103 Ukraine High Field Magnet Laboratory (HFML - EMFL) Radboud University Toernooiveld 7 NL-6525 ED Nijmegen The Netherlands Institute for Molecules and Materials Radboud University Heyendaalseweg 135 NL-525 AJ Nijmegen The Netherlands Experimental Physics V Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg D-86159 Augsburg Germany Dresden High Magnetic Field Laboratory (HLD-EMFL) Helmholtz-Zentrum Dresden–Rossendorf D-01328 Dresden Germany CPHT (Centre de Physique Théorique) CNRS Ecole Polytechnique Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau France Collège de France Université PSL 11 place Marcelin Berthelot F-75005 Paris France Research Center for Materials Science and Engineering Vienna University of Technology Karlsplatz 13 A-1040 Vienna Austria Department of Physics Humboldt-Universitat zu Berlin Newtonstrasse 15 D-12489 Berlin Germany German Aerospace Center (DLR) Institute of Optical Sensor Systems Rutherfordstrasse 2 D-12489 Berlin Germany

We report a magnetization study of the rare-earth-based paramagnet KEr(MoO4)2 in a magnetic field up to 50 T. A recent observation of massive magnetostriction and rotational magnetocaloric effects in this compound triggered interest in the microscopic mechanism behind these phenomena. We combine several experimental techniques to investigate the magnetization behavior up to its saturation along three main crystallographic directions. The synergy of magnetic torque measurements and vibrating sample magnetometry allowed us to reconstruct parallel and perpendicular components of the magnetization vector, enabling us to trace its evolution up to 30 T. Our experiments reveal the magnetization saturation along all principle axes well below the value, expected from crystal electric field calculations. We argue that an externally applied magnetic field induces a distortion of the local environment of Er3+ ions and affects its crystal electric field splitting.

关键词： high magnetic fields Lattice dynamics Magnetic anisotropy Magnetism Magnetization dynamics Magnetic insulators Paramagnets Rare-earth magnetic materials Crystal-field theory First-principles calculations Magnetization measurements Susceptibility measurements Torque magnetometry

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