Article
Chemistry, Physical
E. P. Skipetrov, E. Bogdanov, B. B. Kovalev, L. A. Skipetrova, A. Knotko, A. Emelyanov, A. N. Taldenkov, V. E. Slynko
Summary: We synthesized a single-crystal Pb1-x-ySnxScyTe ingot and studied the magnetic properties of alloys cut from it. The samples exhibited paramagnetic contribution at low temperatures and high-temperature ferromagnetic ordering in p-type samples, with spin-glass-like behavior and ferromagnetic hysteresis loops detected at temperatures below 100 K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Sandhya Susarla, Pablo Garcia-Fernandez, Colin Ophus, Sujit Das, Pablo Aguado-Puente, Margaret McCarter, Peter Ercius, Lane W. Martin, Ramamoorthy Ramesh, Javier Junquera
Summary: This research utilizes a combination of techniques to probe the electronic structure within polar vortices in oxide superlattices at the atomic scale, finding that the peaks in Ti L-edge spectra systematically shift depending on the position of the Ti4+ cations. First-principles computations and simulations derived from first principles show good agreement with experimental results.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Mirjana Dimitrievska, Fredrik S. Hage, Simon Escobar Steinvall, Alexander P. Litvinchuk, Elias Z. Stutz, Quentin M. Ramasse, Anna Fontcuberta Morral
Summary: This study successfully characterizes the band structure of new compounds using high resolution electron energy-loss spectroscopy on nanowires, which correlates well with first principles calculations. This opens the way for non-destructive characterization of new materials and strengthens the route to new materials discovery.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Microscopy
Sercan Keskin, Carly Pawell, Niels de Jonge
Summary: The article discusses methods for verifying the presence of water in graphene liquid cells (GLCs), emphasizing the need to critically consider liquid filling in GLC sample preparation due to the limitations of using a single criterion. The most reliable method is direct observation of the water exciton peak using electron energy loss spectroscopy (EELS), but alternative methods include analyzing image contrast, presence of bubbles, and an oxygen signal in the EEL spectrum. Nanoparticle movement in GLC is not always guaranteed.
Article
Chemistry, Physical
Benjamin K. Miller, Peter A. Crozier
Summary: A fundamental challenge in heterogeneous catalysis is understanding the relationship between surface structure and reactivity, with operando approaches being valuable in differentiating active and spectator structures. An atomic resolution operando approach using mass spectrometry and imaging techniques was applied to the oxidation of carbon monoxide over a supported ruthenium catalyst, revealing that RuO2 layers formed under some reaction conditions are actually spectator species that diminish the catalyst's activity.
Article
Microscopy
Yun-Yu Wang, Sook Fun Chan, Qiang Jin, Kent Zhuang, Jae Kyu Choi
Summary: In this study, a linear relationship was found between the inverse jump ratio of Si L edge and the O/Si and N/Si intensity ratio, which is used for EELS analysis. This method is applied to analyze the elemental distribution in SiON films and compared with XPS analysis. It can also be utilized for flash memory structure (3D NAND) to obtain atomic ratios of N/Si and O/Si for tunnel oxide at a sub-nanometer scale.
Article
Polymer Science
M. Yehia, Sh Labib, S. M. Ismail
Summary: Zn1-xCdxO (x = 0, 0.001, 0.01, 0.1) nanoparticles were prepared using polyol technique and characterized using various methods. The samples showed high purity and crystallized in a specific phase, with one sample exhibiting room temperature ferromagnetism while others displayed diamagnetic behavior. ESR measurements indicated the presence of different types of defects in the prepared samples.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
T. Bilyk, H-W Hsiao, R. Yuan, M. Benchakar, A. Habrioux, S. Celerier, J-M Zuo, J. Pacaud, V Mauchamp
Summary: Properties of MXene multilayers, including the popular Ti3C2T x , are found to depend on their architecture. This study uses VEELS and DFT simulations to analyze layer-dependent changes in VEEL spectra as a probe of total thickness and plasmon energy sensitivity to interlayer distance. The results demonstrate the capability of VEELS to quantify layer number and modify interlayer distance with high precision, making it a powerful method for characterizing MXene multilayers on the nanoscale.
Article
Materials Science, Multidisciplinary
Misa Hayashida, Marek Malac
Summary: This study utilized energy-filtering analysis and bright-field microscopy to measure the thickness of materials samples, and verified the results through electron tomography. The study reported the relationship between thickness and beam intensity in energy-filtering and bright-field microscopy at different angles, and evaluated the mean free path of several materials. These results can guide the evaluation of thickness and optimize electron tomography experiments in energy-filtering and bright-field microscopy.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Hongbin Yang, Andrea Konecna, Xianghan Xu, Sang-Wook Cheong, Eric Garfunkel, F. Javier Garcia de Abajo, Philip E. Batson
Summary: This study demonstrates the existence of relatively long-lived plasmons supported by high-mobility charge carriers in La-doped BaSnO3. The properties of infrared localized surface plasmons in BLSO nanoparticles are systematically investigated using electron energy-loss spectroscopy. The results show that LSPs in BLSO exhibit a high degree of spatial confinement compared to noble metals, and have relatively low losses and high quality factors. Further analysis clarifies the relation between plasmon damping and carrier mobility in BLSO.
Article
Physics, Condensed Matter
I. Krainov, V. F. Sapega, G. S. Dimitriev, N. S. Averkiev
Summary: This paper investigates the magnetic impurities spin relaxation in diluted magnetic semiconductors, finding that the main channel of spin relaxation is through mobile carriers. Experimental results show that with an increase in temperature, the spin relaxation rate of ferromagnetic samples grows, approaching that measured in paramagnetic samples.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Review
Chemistry, Multidisciplinary
Kellie Jenkinson, Luis M. Liz-Marzan, Sara Bals
Summary: Electron tomography is an important technique for visualizing nanoparticle morphology. This article summarizes the experimental and computational development of various multimode tomography techniques and their role in overcoming materials science challenges. Current challenges and future directions of multimode tomography are also discussed.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Xiaoyan Li, Georg Haberfehlner, Ulrich Hohenester, Odile Stephan, Gerald Kothleitner, Mathieu Kociak
Summary: Surface phonon polaritons (SPhPs) are coupled photon-phonon excitations that strongly influence the optical and thermal behavior of nanomaterials. By using a scanning transmission electron microscope with a highly monochromated electron beam, varying SPhP signatures from nanoscale MgO cubes can be visualized and used to tomographically reconstruct the phononic surface electromagnetic fields of the object. This 3D information offers insights into nanoscale physical phenomena and is valuable for the design and optimization of nanostructures for new uses.
Article
Chemistry, Physical
Alice Apponi, Domenica Convertino, Neeraj Mishra, Camilla Coletti, Mauro Iodice, Franco Frasconi, Federico Pilo, Narcis Silviu Blaj, Daniele Paoloni, Ilaria Rago, Giovanni De Bellis, Gianluca Cavoto, Alessandro Ruocco
Summary: In this study, accurate transmission measurements of electrons below 1 keV through suspended monolayer graphene were reported. The monolayer graphene was grown using chemical vapor deposition and transferred onto transmission electron microscopy (TEM) grids. The transparency of graphene was obtained by measuring the direct beam current and transmitted current. The experimental results showed a transmission rate ranging from about 20% to about 80% for monolayer graphene within the experimental electron energy range. The high quality and grid coverage of the suspended graphene were confirmed through various characterization techniques. Additionally, evidence of suspended monolayer graphene was observed after annealing the samples in vacuum at 550 degrees C.
Article
Microscopy
Alicia Ruiz Caridad, Rolf Erni, Alexander Vogel, Marta D. Rossell
Summary: This study demonstrates the performance and suitability of a new electron energy filter combined with a hybrid pixel, direct electron detector for analytical transmission electron microscopy. Through four examples, it shows that this new instrumental setup is capable of producing valuable electron energy-loss spectroscopy (EELS) data at high energy losses, even with short acquisition times, and provides detailed chemical information about complex multilayer samples. The study also highlights the potential for atomically resolved spectrum imaging and elemental mapping using this setup.
Article
Chemistry, Multidisciplinary
Zhaohang Xue, Zipu Fan, Xin Liao, Yaolong Li, Yulu Qin, Guanyu Zhang, Xiaoming Song, Zhi-Min Liao, Dong Sun, Guowei Lu, Qihuang Gong
Summary: The artificial engineering of photoresponse is crucial for optoelectronic applications, and in this study, a metasurface on a semimetallic Cd3As2 nanoplate was designed and fabricated to improve its thermoelectric photoresponse. The metasurface enhanced light absorption and resulted in a temperature gradient, contributing to the thermoelectric photoresponse. The power-dependent and wavelength-dependent measurements confirmed the excellent photoresponse characteristics of the metasurface device, including a linearly dependent photoresponse and efficient separation of photoexcited carriers. The designed metasurface device also demonstrated an anisotropic polarization-dependent photoresponse. This study highlights the potential of metasurfaces in controlling the photoresponse of semimetallic materials.
Article
Physics, Condensed Matter
Jingzhi Fang, Huading Song, Bo Li, Ziqi Zhou, Juehan Yang, Benchuan Lin, Zhimin Liao, Zhongming Wei
Summary: Researchers constructed a two-dimensional Fe doped SnS2 homogeneous junction and discovered that it exhibits large magnetoresistance effect. The magnetoresistance effect can be regulated by applying a gate voltage, making it promising for future applications.
JOURNAL OF SEMICONDUCTORS
(2022)
Article
Physics, Applied
Xin Liao, Chang Xu, Zi-Pu Fan, Ying-Ying Lan, Na Li, Chun-Guang Chu, An-Qi Wang, Dong Sun, Zhi-Min Liao
Summary: The combination of 2D Dirac semimetal graphene and 3D counterpart Cd3As2 in Dirac heterostructures can overcome the weak optical absorption in graphene-based devices and the dark current in pure Cd3As2 photodetectors, leading to high-performance photodetectors with broadband detection, high sensitivity, and rapid response.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Xing-Guo Ye, Huiying Liu, Peng-Fei Zhu, Wen-Zheng Xu, Shengyuan A. Yang, Nianze Shang, Kaihui Liu, Zhi-Min Liao
Summary: This study demonstrates the generation of Berry curvature dipole through an applied dc electric field in WTe2, breaking the symmetry constraint. The dipole moment of Berry curvature shows a linear dependence on the dc electric field, and the polarization direction can be controlled and reversed by changing the relative orientation and polarity of the electric field. This research provides a means to generate and control Berry curvature dipole in various material systems and facilitates the development of nonlinear quantum devices.
PHYSICAL REVIEW LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Jiapeng Xu, Zhimin Liao, Qi Wang, Bo Liu, Xiaoli Tang, Zhiyong Zhong, Lei Zhang, Yuanjing Zhang, Huaiwu Zhang, Lichuan Jin
Summary: This study experimentally demonstrates that the transmission efficiency of low-k spin waves can be enhanced through surface metallization of yttrium iron garnet (YIG), resulting in increased group velocity and low spin-pumping efficiency. The competition between spin-pumping effects and the introduction of enhanced group velocity by metal decoration describes the essence of partial signal enhancement in the spin-wave transmission spectrum. The work provides a practical way to achieve spin-wave manipulation and low-loss transmission.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Hao-Nan Cui, Guang-Yu Zhu, Jian-Kun Wang, Jia-Jie Yang, Wen-Zhuang Zheng, Ben-Chuan Lin, Zhi-Min Liao, Shuo Wang, Da-Peng Yu
Summary: A novel negative magnetoresistance effect has been observed in Cd3As2 nanowires, which is related to the massless Dirac or Weyl fermions in these nanostructures. The negative magnetoresistance can reach -16% at 1.5 K and persists to -1% at room temperature. The gate tuning and angle dependence suggest that this effect is different from the chiral anomaly and may be attributed to percolating current paths induced by charge puddles and disorder.
Article
Chemistry, Physical
Congcong Zhang, Teng Tu, Jingyue Wang, Yongchao Zhu, Congwei Tan, Liang Chen, Mei Wu, Ruixue Zhu, Yizhou Liu, Huixia Fu, Jia Yu, Yichi Zhang, Xuzhong Cong, Xuehan Zhou, Jiaji Zhao, Tianran Li, Zhimin Liao, Xiaosong Wu, Keji Lai, Binghai Yan, Peng Gao, Qianqian Huang, Hai Xu, Huiping Hu, Hongtao Liu, Jianbo Yin, Hailin Peng
Summary: The scaling of silicon-based transistors faces challenges such as interface imperfections and gate current leakage at sub-ten-nanometre technology nodes. To achieve smaller channel sizes, less interfacial scattering, and more efficient gate-field penetration, high-mobility two-dimensional layered semiconductors are expected as channel materials. However, progress in 2D electronics is hindered by the lack of a high dielectric constant dielectric with an atomically flat and dangling-bond-free surface.
Article
Physics, Multidisciplinary
Hao-Nan Cui, Ze-Nan Wu, Jian-Kun Wang, Guang-Yu Zhu, Jia-Jie Yang, Wen-Zhuang Zheng, Zhi-Min Liao, Shuo Wang, Ben-Chuan Lin, Dapeng Yu
Summary: This study reports a novel nonlinear behavior of chiral anomaly in the Dirac semimetal Cd3As2, characterized by resistance-increasing and current source-strengthening properties at an intermediate magnetic field of approximately 5 T. Trivial factors such as thermal effects, geometric artifacts, and anisotropy were ruled out through angle-dependence experiments. Additionally, non-Ohmic electric quantum oscillations were observed when a high direct current of 300 μA was applied, suggesting the formation of quantized levels due to Bloch oscillation in the high DC regime.
Article
Chemistry, Applied
Chengyi Zhang, Shuang Xia, Miao Yan, Fen Luo, Bikui Zhang, Wei Zou, Hui Gong
Summary: In this study, we aimed to explore the mechanisms and targets of Diwu Yanggan Capsule (DWYG), a traditional Chinese medicine used in liver regeneration. We obtained the active ingredients and targets of DWYG from the TCMSP database and DEGs related to liver regeneration from the GEO database. We also searched for liver regeneration-related genes in disease databases and integrated them with the herbal and GEO data to identify potential targets of DWYG in liver regeneration. Our results revealed 73 potential targets of DWYG in liver regeneration and suggested that it may act through pathways such as MAPK, TNF, and IL-17. We also found that quercetin, a major component of DWYG, had a low binding energy to three key targets. This study highlights the potential of DWYG in facilitating liver regeneration, with quercetin possibly being its core ingredient.
NATURAL PRODUCT RESEARCH
(2023)
Article
Physics, Multidisciplinary
Chun-Guang Chu, An-Qi Wang, Zhi-Min Liao
Summary: Topological semimetals are exotic phases of quantum matter with gapless electronic excitation protected by symmetry. The hybrid system of topology and superconductivity has attracted wide interest due to its potential application in topological quantum computing. Recent experimental progress of topological semimetal-superconductor heterojunctions is reviewed, including the Josephson current as a mode filter and the detection and manipulation of topological superconductivity and Majorana zero modes. Outlooks of future research on topological semimetal-superconductor heterojunctions and their application in Majorana braiding and topological quantum computing are discussed.
ACTA PHYSICA SINICA
(2023)
Article
Materials Science, Multidisciplinary
An-Qi Wang, Peng-Zhan Xiang, Zhi-Min Liao
Summary: We observe nonreciprocal spin transport in two-dimensional topological insulator Cd3As2 nanoplates under nonlocal configuration, where the nonlocal spin voltage amplitude exhibits anomalous nonreciprocity with respect to the direction of local bias current. This unusual nonreciprocity can be well understood by combining the charge current spreading and thermally induced spin polarization of topological surface states.
Article
Materials Science, Multidisciplinary
Jing-Zhi Fang, Hao-Nan Cui, Shuo Wang, Jing-Di Lu, Guang-Yu Zhu, Xin-Jie Liu, Mao-Sen Qin, Jian-Kun Wang, Ze-Nan Wu, Yan-Fei Wu, Shou-Guo Wang, Zhen-Sheng Zhang, Zhongming Wei, Jinxing Zhang, Ben-Chuan Lin, Zhi-Min Liao, Dapeng Yu
Summary: We report on the electrically tunable exchange bias in the van der Waals MnBi2Te4/Cr2Ge2Te6 heterostructure, where the exchange bias emerges over a critical magnetic field and reaches its maximum near the band gap. Moreover, the exchange bias mainly affects the net ferromagnetic (FM) layers of MnBi2Te4 rather than the pure FM insulator Cr2Ge2Te6. This van der Waals heterostructure provides a promising platform for studying the novel exchange bias effect and exploring the potential applications in spintronics or high-Tc quantum anomalous Hall effect.
Article
Materials Science, Multidisciplinary
Zhen-Cun Pan, Chun-Guang Chu, Jing-Jing Chen, An-Qi Wang, Zhen-Bing Tan, Wen-Zheng Xu, Jun Xu, Xiu-Mei Ma, Da-Peng Yu, Zhi-Min Liao
Summary: Transport evidence for 1D helical edge states in MoTe2 thin flakes is reported, and Altshuler-Aronov-Spivak interference and temperature evolution of the fast Fourier transform amplitude are observed, deepening the understanding of higher-order topological properties of MoTe2.
Article
Multidisciplinary Sciences
Chun-Guang Chu, Jing-Jing Chen, An-Qi Wang, Zhen-Bing Tan, Cai-Zhen Li, Chuan Li, Alexander Brinkman, Peng-Zhan Xiang, Na Li, Zhen-Cun Pan, Hai-Zhou Lu, Dapeng Yu, Zhi-Min Liao
Summary: In this study, broad edge supercurrent is observed in Dirac semimetal Cd3As2-based Josephson junctions, indicating the presence of non-Hermitian skin effect. The wide and large edge supercurrent, as well as the observed supercurrent nonlocality, suggest the interplay between band topology and non-Hermiticity in exploiting exotic topological matter.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Xing-Guo Ye, Peng-Fei Zhu, Wen-Zheng Xu, Zhihao Zang, Yu Ye, Zhi-Min Liao
Summary: In this study, the orbital polarization and its induced third-order anomalous Hall effect (AHE) were investigated in few-layer WTe2 flakes. Through experimental measurements and analysis, it was found that the third-order AHE is consistent with the electric field induced polarization of orbital magnetic moment caused by the Berry connection polarizability tensor. The microscopic mechanisms of the third-order AHE were further analyzed through scaling law.
