Article
Chemistry, Physical
Bodong Lv, Rui Zhong, Xiaohua Luo, Shengcan Ma, Changcai Chen, Sujuan Wang, Qing Luo, Fei Gao, Chunsheng Fang, Weijun Ren, Zhenchen Zhong
Summary: The anomalous Hall effect in the kagome ferromagnet YbMn6Sn6 single crystal is observed, where an intrinsic anomalous Hall conductivity of 40.2 omega-1 center dot cm-1 is obtained. YbMn6Sn6 exhibits an easy-plane ferromagnetic structure and the magnetoresistance is positive at low temperatures, transitioning to negative with increasing temperature. These findings suggest that YbMn6Sn6 holds promise as a platform for studying the relationship between magnetic and electronic structure and exploring novel quantum phenomena.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Yinong Zhou, Gurjyot Sethi, Hang Liu, Zhengfei Wang, Feng Liu
Summary: This article proposes theoretical concepts and models to describe the excited quantum anomalous Hall effect and quantum spin Hall effect generated by the dissociation of an excitonic insulator state. These effects are based on the nontrivial band topology and complete population inversion in 2D materials, and have important scientific significance and potential applications.
Article
Physics, Multidisciplinary
Guan-Hua Huang, Zhi-Fang Xu, Zhigang Wu
Summary: An intrinsic anomalous Hall effect is predicted to exist in a bosonic chiral superfluid in a 2D hexagonal boron nitride optical lattice. The high-frequency limit of the Hall conductivity is determined by finite loop current correlations, while the dc Hall conductivity traces back to the noninteracting band Berry curvature at the condensation momentum.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Dong Chen, Congcong Le, Chenguang Fu, Haicheng Lin, Walter Schnelle, Yan Sun, Claudia Felser
Summary: LiMn6Sn6 is a kagome ferromagnet with a large anomalous Hall effect, high ferromagnetism, and easy plane characteristics. Through experiments and calculations, it is found that there is a coexistence of electrons and holes in the material, and the main anomalous Hall effect is attributed to band crossings near the Fermi energy.
Article
Chemistry, Multidisciplinary
Kacho Imtiyaz Ali Khan, Ram Singh Yadav, Himanshu Bangar, Akash Kumar, Niru Chowdhury, Prasanta Kumar Muduli, Pranaba Kishor Muduli
Summary: In this study, we investigate the growth of Fe3Sn2 thin films on Si/SiO2 substrates with two different seed layers (Ta and Pt). We find that Pt/Fe3Sn2 thin films form a pure ferromagnetic phase with higher saturation magnetization and exhibit an anomalous Hall coefficient that is two orders of magnitude higher than traditional ferromagnets. These results are important for the development of novel topological spintronic devices.
Article
Chemistry, Multidisciplinary
Peng Zhang, Purnima P. Balakrishnan, Christopher Eckberg, Peng Deng, Tomohiro Nozaki, Su Kong Chong, Patrick Quarterman, Megan E. Holtz, Brian B. Maranville, Gang Qiu, Lei Pan, Eve Emmanouilidou, Ni Ni, Masashi Sahashi, Alexander Grutter, Kang L. Wang
Summary: The exchange-coupled CBST and Al-Cr2O3 interface have perpendicular magnetic moments, leading to an exchange-biased QAH effect. The magnitude and sign of the exchange bias can be effectively controlled using a field training process. This study demonstrates the use of exchange bias to manipulate the QAH state.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yazhou Deng, Ziji Xiang, Bin Lei, Kejia Zhu, Haimen Mu, Weizhuang Zhuo, Xiangyu Hua, Mingjie Wang, Zhengfei Wang, Guopeng Wang, Mingliang Tian, Xianhui Chen
Summary: This study reports the layer-number-dependent magnetotransport properties in the 2D ferromagnet Fe5GeTe2. It is found that the ferromagnetism changes from soft to hard upon thinning, and a perpendicular easy-axis anisotropy is achieved in bilayer flakes. The monolayer flakes exhibit spin-glass-like behavior. These results demonstrate the tunability of magnetotransport properties in atomically thin van der Waals magnets, which holds promise for engineering high-performance spintronic devices.
Article
Multidisciplinary Sciences
Hasan Siddiquee, Christopher Broyles, Erica Kotta, Shouzheng Liu, Shiyu Peng, Tai Kong, Byungkyun Kang, Qiang Zhu, Yongbin Lee, Liqin Ke, Hongming Weng, Jonathan D. D. Denlinger, L. Andrew Wray, Sheng Ran
Summary: In this study, the authors report a large anomalous Hall conductivity in a Kondo lattice ferromagnet USbTe, which is dominated by intrinsic Berry curvature at low temperatures. However, the scaling relation derived from Fermi liquid theory does not hold for the Berry curvature induced anomalous Hall effect. The onset of the Berry curvature contribution is consistent with the Kondo coherent temperature. Combined with ARPES measurement and DMFT calculations, the results strongly suggest that Berry curvature is hosted by the flat bands induced by Kondo hybridization at the Fermi level. This highlights the need for new theories to explain the interaction between strong correlation and Berry curvature in anomalous Hall effect.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Subhajit Roychowdhury, Mengyu Yao, Kartik Samanta, Seokjin Bae, Dong Chen, Sailong Ju, Arjun Raghavan, Nitesh Kumar, Procopios Constantinou, Satya N. Guin, Nicholas Clark Plumb, Marisa Romanelli, Horst Borrmann, Maia G. Vergniory, Vladimir N. Strocov, Vidya Madhavan, Chandra Shekhar, Claudia Felser
Summary: In this study, the electronic structure of ferromagnetic EuCd2As2, predicted to be an ideal Weyl semimetal, is investigated using angle-resolved photoemission spectroscopy and scanning tunneling microscopy. The experimental results are in close agreement with the first principles calculations. Furthermore, anomalous Hall conductivity and Nernst effect are observed, resulting from the non-zero Berry curvature and the topological Hall effect arising from changes in the band structure caused by spin canting produced by magnetic fields. These findings provide insights into exotic quantum phenomena in inorganic topological materials with multiple pairs of Weyl nodes.
Article
Multidisciplinary Sciences
T. Yokoi, S. Ma, Y. Kasahara, S. Kasahara, T. Shibauchi, N. Kurita, H. Tanaka, J. Nasu, Y. Motome, C. Hickey, S. Trebst, Y. Matsuda
Summary: Recent reports have shown the presence of half-integer thermal quantum Hall conductance in the two-dimensional honeycomb material alpha-RuCl3, even in magnetic fields without out-of-plane components. The measured field-angular variation of the quantized thermal Hall conductance in alpha-RuCl3 has the same sign structure as the topological Chern number of the pure Kitaev spin liquid, indicating that the non-Abelian topological order persists in the presence of non-Kitaev interactions.
Article
Materials Science, Multidisciplinary
F. Schilberth, N. Unglert, L. Prodan, F. Meggle, J. Ebad Allah, C. A. Kuntscher, A. A. Tsirlin, V Tsurkan, J. Deisenhofer, L. Chioncel, I Kezsmaerki, S. Bordacs
Summary: This study investigates the quantum Hall effect and anomalous Hall effect in kagome materials, and probes the band structure features through optical conductivity spectra. The results show that low-energy transitions contribute significantly to the anomalous Hall effect, which is further enhanced by contributions from higher-energy interband transitions. The study also reveals band reconstructions near the Fermi level due to local Coulomb interactions.
Article
Materials Science, Multidisciplinary
Xiuxian Yang, Xiaodong Zhou, Wanxiang Feng, Yugui Yao
Summary: In this study, we systematically investigate the spin-order-dependent magneto-optical effect, anomalous Hall effect, and anomalous Nernst effect in the two-dimensional room-temperature ferromagnet 1T-CrTe2. We found that these effects can be effectively modulated by altering spin direction and layer number in this material. The results provide insights into the magneto-optical and anomalous transports properties of 1T-CrTe2.
Article
Engineering, Electrical & Electronic
Bijun Tang, Xiaowei Wang, Mengjiao Han, Xiaodong Xu, Zhaowei Zhang, Chao Zhu, Xun Cao, Yumeng Yang, Qundong Fu, Jianqun Yang, Xingji Li, Weibo Gao, Jiadong Zhou, Junhao Lin, Zheng Liu
Summary: Cr5Te8 flakes with strong ferromagnetism and unique magnetotransport properties can be grown using chemical vapour deposition.
NATURE ELECTRONICS
(2022)
Article
Physics, Applied
Xiangqi Wang, Jun Tan
Summary: Lifshitz transition leads to a change in the Fermi level and provides an opportunity to study the relationship between Fermi-surface topology and Berry curvature. In LiMn6Sn6, a ferromagnetic Kagome-lattice material, we observed a switch from extrinsic to intrinsic anomalous Hall effect around a Lifshitz transition. The Lifshitz transition is manifested by a flip in the ordinary Hall resistivity, indicating a significant change in the Fermi surface topology.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Ryuki Suzuki, Tenghua Gao, Hiroki Nakayama, Kazuya Ando
Summary: We investigated the anomalous Hall effect in a van der Waals material Fe5GeTe2, and found that it exhibits a distinct temperature dependence associated with the evolution of magnetic states in the material. The anomalous Hall conductivity in the low-temperature region changes with the longitudinal conductivity, indicating a significant contribution from the extrinsic mechanism. Moreover, the skew scattering coefficient in Fe5GeTe2 is found to be an order of magnitude larger than that in transition metal ferromagnets, shedding light on the role of the extrinsic mechanism in the anomalous Hall effect in van der Waals magnets.
Article
Energy & Fuels
Jijiang Ge, Qianhui Wu, Lei Ding, Hongbin Guo, An Zhao
Summary: The THSG gel system shows superior rheological properties and dilution compared to traditional gel systems, making it more effective in injecting and filling gelant into fractures and small apertures. The clay particles strengthened THSG gels have high storage modulus and rupture pressure, effectively preventing the adverse effects of gravity segregation.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Agricultural Engineering
An Zhao, Shanjian Liu, Jingang Yao, Fupeng Huang, Zhisen He, Jia Liu
Summary: This study focused on preparing nitrogen-containing chemicals and nitrogen-rich biochar using ammonia torrefaction pretreatment technology, and evaluated the effects of temperature and duration on the characteristics of the products. It was found that higher torrefaction temperature led to increased nitrogen content and promoted the formation of quaternary-N while reducing other nitrogen species. Ammonia torrefaction was also found to promote pyridine formation and decrease oxygen-containing species, with torrefaction duration positively impacting the yield of nitrogen-containing chemicals.
BIORESOURCE TECHNOLOGY
(2022)
Article
Thermodynamics
Shanjian Liu, An Zhao, Zhisen He, Yongjun Li, Dongmei Bi, Xin Gao
Summary: This study investigates the effects of urea concentration and pyrolysis temperature on the composition of bio-oil. The results demonstrate that nitrogen-rich pyrolysis increases the phenolic content, decreases the aldehyde and ketone content, and enhances the production of nitrogenous heterocyclic compounds.
Article
Energy & Fuels
Yanmei Li, Chunyan Tian, Nianze Zhang, An Zhao, Xueyuan Bai, Weiming Yi, Peng Fu
Summary: The study found that coliquefaction of pyroligneous acid and cornstalk at high temperatures can promote the formation of biocrude oil and accumulation of solid residue, leading to adjustments in the distribution of organic components in the products compared to hydrothermal liquefaction using water alone.
Article
Agricultural Engineering
Shanjian Liu, Zhisen He, Qing Dong, An Zhao, Fupeng Huang, Dongmei Bi
Summary: Washing pretreatment during nitrogen-rich pyrolysis of corn cob can enhance the yield and selectivity of high-value nitrogen-containing compounds, while reducing water content and acidity.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Qihong Feng, Kuankuan Wu, Jiyuan Zhang, Sen Wang, Xianmin Zhang, Daiyu Zhou, An Zhao
Summary: This study proposes the use of a deep long-short-term memory neural network as a proxy model for a compositional numerical simulator to accelerate the optimization speed in gas flooding. In practical applications, this method demonstrates comparable accuracy and significantly improved efficiency.
Article
Thermodynamics
Xue Zhang, Yuliang Su, Lei Li, Qi'an Da, Yongmao Hao, Wendong Wang, Jiahui Liu, Xiaogang Gao, An Zhao, Kaiyu Wang
Summary: Injecting CO2 into deep reservoirs with high temperature and pressure has the potential to enhance oil recovery and CO2 utilization and storage. This study conducted water/gas flooding experiments in a microfluidic system to investigate the mechanisms of micro-remaining oil and formation damage. The results showed that scCO2 extraction and carbonated water swelling recovered a significant amount of remaining oil. Additionally, water injection into heterogeneous reservoirs resulted in unstable displacement fronts in high-permeability zones. The subsequent injection of scCO2 led to asphaltene deposition and reduced reservoir permeability.
Article
Energy & Fuels
Zongfa Li, Yuliang Su, Lei Li, Yongmao Hao, Wendong Wang, Yang Meng, An Zhao
Summary: This study explored the potential of water alternating gas (WAG) flooding in CO2 storage through experimental and numerical simulation methods. It was found that WAG flooding after water flooding enhanced oil recovery, but also displaced some of the previously stored CO2. The study identified key factors influencing CO2 storage and achieved higher CO2 storage through optimization.
Article
Energy & Fuels
Hongbin Guo, Jijiang Ge, Hao Wu, Tianci Zhang, An Zhao
Summary: In this study, temperature-resistant gel was used to block the steam channeling channel and improve the steam stimulation effect. The addition of nanoparticles significantly extended the stability time of the gel and also enhanced the structural strength and thermal stability of the gel.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Jia Liu, Shanjian Liu, An Zhao, Dongmei Bi, Di Yao, Ranran Kong
Summary: A new strategy for the co-pyrolysis of chitin and nitrogen carriers to produce nitrogen-rich bio-oil and biochar was proposed in this study. Four different nitrogen carriers were selected and their effects on the thermal behavior and product distribution were characterized. The results showed that the addition of nitrogen carriers promoted the production of amines, with glutamate having the most significant inhibitory effect on volatile gases. The study expands the boundaries of high-value utilization of chitin.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Applied
Shanjian Liu, An Zhao, Jia Liu, Mengqian Yin, Fupeng Huang, Dongmei Bi
Summary: This study aimed to investigate the mechanism of nitrogen doping, migration, and conversion during ammonia torrefaction and also explore the evolution law of the chemical structure of cellulose. The results showed that the ammonia torrefaction pretreatment could significantly optimize the distribution of nitrogen and oxygen elements in cellulose. The carbon skeleton first captured the active nitrogenous radicals to form -NHn-N, and pyridine-N and pyrrole-N originated from the conversion of -NHn-N. The existence of C@O played a major role in the immobilization of nitrogen. The nitrogen in bio-oil exists mainly in the form of five-and six-membered heterocycles. The correlation analysis showed that the main precursors for the formation of nitrogenous heterocyclic compounds were five-membered O-heterocyclic compounds. Finally, the product distribution characteristics in the torrefaction-pyrolysis systems were summarized, and the nitrogen doping and conversion mechanisms were proposed. This study expanded the boundaries of cellulose pretreatment and the production of high-value chemicals.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Astronomy & Astrophysics
Chen Su, Huanyuan Shan, Jiajun Zhang, Cheng Zhao, Jiaxi Yu, Qiao Wang, Linfeng Xiao, Xiangkun Liu, An Zhao
Summary: Weak-lensing studies via cosmic voids offer a promising approach for investigating modified gravity (MG). In this study, we use the ray-tracing method to analyze the excess surface mass density (ESD) around voids based on cubic Galileon (CG) gravity simulations. By combining an N-body simulation and the ray-tracing method, we accurately account for changes in structure formation and deflection angle caused by MG, resulting in more realistic extraction of lensing signals. Our findings demonstrate good agreement between ESD measurements and theoretical predictions for CG gravity, with the deflection angle having less impact on the lensing signals compared to structure formation.
ASTROPHYSICAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Bo Fu, Shun-Qing Shen
Summary: The coherence length of two Majorana zero-energy modes in a p-wave topological superconductor is inversely proportional to the superconducting order parameter. We studied the finite size effect of Majorana zero modes in a topological insulator/superconductor heterostructure with a vortex, and found that the coherence length of the two zero-energy modes at the terminals of a vortex line is independent of the superconducting order parameter, instead determined by the intrinsic properties of the topological insulator. This anomaly illustrates the topological distinction of the superconducting topological insulator, contrary to a p-wave topological superconductor.
Article
Materials Science, Paper & Wood
Di Yao, Dongmei Bi, An Zhao, Jia Liu, Jing Liu, Bozheng Li
Summary: A novel method for the generation of methylcyclopentenone and pyridone via the modification of a catalyst was proposed. Different reaction temperatures and catalyst types were found to play a crucial role in the formation of the desired products. The use of ZnO-loaded magnesium aluminum spinel as a catalyst significantly increased the yield of methylcyclopentenone and pyridone.
Article
Materials Science, Multidisciplinary
Jin-Yu Zou, Bo Fu, Huan-Wen Wang, Zi-Ang Hu, Shun-Qing Shen
Summary: In this study, we investigate the topological and transport properties of a class of parity anomalous semimetals and uncover the distinct bulk-edge correspondence. We find that the half-quantized Hall effect is realized via the bulk massless Dirac fermions while the nontrivial Berry curvature is provided by the massive Dirac fermions. The spatial distribution of the edge current in these materials decays according to a power law instead of an exponential law in the integer quantum Hall effect. We also discuss the physical relevance of parity anomalous semimetals to three-dimensional semimagnetic topological insulators and two-dimensional photonic crystals.
