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512 results on '"Qiu, Zhiyong"'

104. Photoexcitation induced magnetic phase transition and spin dynamics in antiferromagnetic MnPS3 monolayer.

Author

Gao, Yinlu, Jiang, Xue, Qiu, Zhiyong, and Zhao, Jijun

Subjects
MAGNETIC transitions, MONOMOLECULAR films, PHASE transitions, PHOTOEXCITATION, SPIN crossover, ELECTRONIC excitation, MAGNETIC control
Abstract

Antiferromagnetic spin dynamics is the key issue to develop spintronic devices. We adopt ab initio nonadiabatic molecular dynamics with spin–orbit-coupling (SOC) to investigate photoinduced spin dynamics in an antiferromagnetic semiconductor MnPS3 monolayer. Optical doping triggers MnPS3 from Néel antiferromagnetic to ferromagnetic phase at an experimentally achievable electron–hole pair density of 1.11 × 1014 cm−2. This phase transition can be ascribed to the light-induced mid-gap states of S-p orbitals, which lower the electron excitation energy and strengthen the SOC effect between S-p and Mn-d orbitals. The excited S-p electrons first decay to the mid-gap states due to p–p electron–phonon-coupling and then relax to the spin-down Mn-d orbitals via SOC. Such a dramatic relaxation process prolongs the photogenerated carrier lifetime up to 648 fs, providing an explanation for the unusual optoelectronic performance of MnPS3. The reversible switching of magnetic order via optical means gives an important clue for information storage and highly efficient photocatalysts utilizing antiferromagnetic semiconductors. [ABSTRACT FROM AUTHOR]

Published
2023
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107. Probe of antiferromagnetic transition via thermal-excited incoherent spin current.

Author

Peng, Yibo, Sha, Rongxin, Wang, Mengyi, Liu, Min, Guo, Fangzhun, Zhang, Ziyang, Zou, Ailiang, Xu, Yuekui, and Qiu, Zhiyong

Subjects
YTTRIUM iron garnet, SEEBECK effect, PHASE transitions
Abstract

Spin Seebeck effect (SSE) for an yttrium iron garnet (YIG)/nickel oxide (NiO)/platinum (Pt) trilayer device was studied in a wide temperature range. It is found that the SSE signal is nonmonotonic in the temperature domain and shows a maximum around the Néel temperature of the NiO layer, which is similar to the temperature dependence of the spin pumping signal in the same device. This result identified that the thermal-excited incoherent spin currents are also sensitive to the fluctuation of an antiferromagnetic system and can be used to probe the antiferromagnetic phase transition. Furthermore, the antiferromagnetic NiO layer is considered to be valuable for the optimization of spin transport efficiency at YIG/Pt interface, which enhances the SSE signal around room temperature. [ABSTRACT FROM AUTHOR]

Published
2020
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111. Nonlinear mode couplings between geodesic acoustic mode and toroidal Alfvén eigenmodes in the EAST tokamak

Author

Zhu, Xiang, primary, Zeng, Long, additional, Qiu, Zhiyong, additional, Lin, Shiyao, additional, Zhang, Tao, additional, Bao, Jian, additional, Hu, Youjun, additional, Tang, Tian, additional, Liu, Haiqing, additional, Kong, Defeng, additional, Wang, Yumin, additional, Shi, Tonghui, additional, Hao, Baolong, additional, Qian, Jinping, additional, Zang, Qing, additional, Lyu, Bo, additional, Wu, Muquan, additional, Li, Hang, additional, Jie, Yinxian, additional, Gao, Xiang, additional, and Lin, Xiaodong, additional

Published
2022
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113. Relationship between circulating lung-specific X protein messenger ribonucleic acid expression and micrometastasis and prognosis in patients with early-stage nonsmall cell lung cancer

Author

Cui, Yangang, Wang, Weibo, Yao, Shuyang, Qiu, Zhiyong, and Cong, Lei

Subjects
Antigen-antibody reactions -- Health aspects, Messenger RNA -- Analysis, Lung cancer, Non-small cell -- Diagnosis -- Genetic aspects, RNA -- Analysis, Health
Abstract

Byline: Yangang. Cui, Weibo. Wang, Shuyang. Yao, Zhiyong. Qiu, Lei. Cong Aims: To investigate the diagnostic value of lung-specific X protein (LUNX) messenger ribonucleic acid (mRNA) expression in peripheral blood [...]

Published
2020

115. MR Image Registration Based on Pulse-Coupled Neural Networks

Author

Qiu, Zhiyong, Dong, Jiyang, Chen, Zhong, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Rangan, C. Pandu, editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Liu, Derong, editor, Fei, Shumin, editor, Hou, Zengguang, editor, Zhang, Huaguang, editor, and Sun, Changyin, editor

Published
2007
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124. Antigen Kinetics Determines Immune Reactivity

Author

Johansen, Pål, Storni, Tazio, Rettig, Lorna, Qiu, Zhiyong, Der-Sarkissian, Ani, Smith, Kent A., Manolova, Vania, Lang, Karl S., Senti, Gabriela, Müllhaupt, Beat, Gerlach, Tilman, Speck, Roberto F., Bot, Adrian, and Kündig, Thomas M.

Published
2008
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127. Excitation of RSAEs during Sawteeth-Like Oscillation in EAST

Author

Xu, Ming, primary, Zhong, Guoqiang, additional, Hao, Baolong, additional, Shen, Wei, additional, Hu, Liqun, additional, Chen, Wei, additional, Qiu, Zhiyong, additional, Zhang, Xuexi, additional, Hu, Youjun, additional, Li, Yingying, additional, Zhao, Hailin, additional, Liu, Haiqing, additional, and Lyu, Bo, additional

Published
2021
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139. Spin transport in different oxide phases of copper

Author

Sha, Rongxin, primary, Liu, Qinxi, additional, Wang, Mengyi, additional, Liu, Min, additional, Peng, Yibo, additional, Zhang, Ziyang, additional, Zou, Ailiang, additional, Xu, Yuekui, additional, Jiang, Xue, additional, and Qiu, Zhiyong, additional

Published
2021
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141. Dependence of fishbone cycle on energetic particle intensity in EAST low-magnetic-shear plasmas

Author

Zhu, Xiang, primary, Zeng, Long, additional, Qiu, Zhiyong, additional, Hao, Baolong, additional, Shen, Wei, additional, Gu, Xiang, additional, Wu, Muquan, additional, Tang, Tian, additional, Qian, Jinping, additional, Liu, Haiqing, additional, Jiang, Di, additional, Xu, Liqing, additional, Zhang, Jizong, additional, Liu, Yong, additional, Zang, Qing, additional, Jie, Yinxian, additional, Gao, Xiang, additional, and Lin, Xiaodong, additional

Published
2020
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148. Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation.

Author

Chen, Ningfei, Wei, Shizhao, Wei, Guangyu, and Qiu, Zhiyong

Subjects
ACOUSTIC excitation, NUMERICAL solutions to equations, GEODESICS, TURBULENCE, GROUP velocity, MODULATIONAL instability, PLASMA turbulence
Abstract

The two-field equations that govern fully nonlinear dynamics of the drift wave (DW) and geodesic acoustic mode (GAM) interaction in toroidal geometry are derived within the nonlinear gyrokinetic framework. Two stages with distinctive features are identified and analyzed using both analytical and numerical approaches. In the ‘linear’ growth stage, the derived set of nonlinear equations can be reduced to the intensively studied parametric decay instability, accounting for the spontaneous resonant excitation of GAM by the DW. The main results of previous works on spontaneous GAM excitation, e.g. the greatly enhanced GAM group velocity and the nonlinear growth rate of GAM, are reproduced from the numerical solution of the two-field equations. In the fully nonlinear stage, soliton structures are observed to form due to the balancing of the self-trapping effect by the spontaneously excited GAM and kinetic dispersiveness of the DW. The soliton structures enhance turbulence spreading from the DW linearly unstable region to the stable region, exhibiting convective propagation instead of a typical linear dispersive process, and are thus expected to induce core-edge interaction and nonlocal transport. [ABSTRACT FROM AUTHOR]

Published
2022
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