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Identifying the genes of unconventional high temperature superconductors

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Science Bulletin 2016年第7期61卷 561-569页

作者： jiangping hu Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China

We elucidate a recently emergent framework in unifying the two families of high temperature （high To） superconductors, cuprates and iron-based superconductors. The unification suggests that the latter is simply the counterpart of the former to realize robust extended s-wave pairing symmetries in a square lattice. The unification identifies that the key ingredients （gene） of high Tc superconductors is a quasi two dimensional electronic environment in which the d-orbitals of cations that partic- ipate in strong in-plane couplings to the p-orbitals of anions are isolated near Fermi energy. With this gene, the superexchange magnetic interactions mediated by anions could maximize their contributions to superconductivity. Creating the gene requires special arrangements between local electronic structures and crystal lattice structures. The speciality explains why high Tc superconductors are so rare. An explicit prediction is made to realize high Tc superconductivity in Co/Ni-based materials with a quasi two dimensional hexagonal lattice structure formed by trigonal bipyramidal complexes.

关键词： Cuprates Iron-based superconductors Unconventional high Tc superconducotors Superexchange

Topological quantum states of matter in iron-based superconductors:from concept to material realization

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National Science Review 2019年第2期6卷 213-226页

作者： Ning Hao jiangping hu Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences CAS Center of Excellence in Topological Quantum Computation and Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences Collaborative Innovation Center of Quantum Matter

We review recent progress in the exploration of topological quantum states of matter in iron-based superconductors. In particular, we focus on the non-trivial topology existing in the band structures and superconducting states of iron’s 3d orbitals. The basic concepts, models, materials and experimental results are reviewed. The natural integration between topology and high-temperature superconductivity in iron-based superconductors provides great opportunities to study topological superconductivity and Majorana modes at high temperature.

关键词： iron-based superconductor topological insulator topological superconductor spin–orbit coupling

OPTIMAL TARGET TRAJECTORY ESTIMATION AND FILTERING USING NETWORKED SENSORS

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Journal of Systems Science & Complexity 2008年第3期21卷 325-336页

作者： jiangping hu Xiaoming hu Optimization and Systems Theory and ACCESS Linnaeus Center Royal Institute of Technology Stockholm 10044 Sweden

Target tracking using distributed sensor network is in general a challenging problem because it always needs to deal with real-time processing of noisy information. In this paper the problem of using nonlinear sensors such as distance and direction sensors for estimating a moving target is studied. The problem is formulated as a prudent design of nonlinear filters for a linear system subject to noisy nonlinear measurements and partially unknown input, which is generated by an exogenous system. In the worst case where the input is completely unknown, the exogenous dynamics is reduced to the random walk model. It can be shown that the nonlinear filter will have optimal convergence if the number of the sensors are large enough and the convergence rate will be highly improved if the sensors are deployed appropriately. This actually raises an interesting issue on active sensing： how to optimally move the sensors if they are considered as mobile multi-agent systems？ Finally, a simulation example is given to illustrate and validate the construction of our filter.

关键词： Optimal filter sensor network target tracking

Fixed-Time Stabilization of High-Order Uncertain Nonlinear Systems:Output Feedback Control Design and Settling Time Analysis

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Journal of Systems Science & Complexity 2023年第4期36卷 1351-1372页

作者： GUO Chaoqun hu jiangping School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Yangtze Delta Region Institute(huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China

This paper is devoted to stabilizing the high-order uncertain nonlinear system in a fixed time by output feedback ***,a novel settling time solution method is proposed by establishing an indirect double system and using the comparison *** a fixed-time observer and a neural networked based adaptive law are constructed to estimate the state and the unknown disturbance for the high-order uncertain nonlinear ***,a fixed-time output feedback controller is proposed via the homogeneity *** upper bound of the settling time is analyzed for the closed-loop system under the proposed output feedback ***,simulation examples are given to illustrate the effectiveness of the theoretical results.

关键词： Fixed-time observer high-order uncertain system homogeneity approach output feedback control settling time

A possible new family of unconventional high temperature superconductors

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Science Bulletin 2017年第3期62卷 212-217页

作者： jiangping hu Congcong Le Beijing Notional Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China School of Physics University of Chinese Academy of Sdences Beijing 100049 China

We suggest a new family of Co[Ni-based materials that may host unconventional high temperature superconductivity （high-To）. These materials carry layered square lattices with each layer being formed by vertex-shared transition metal tetrahedra cation-anion complexes. The electronic physics in these materials is determined by the two dimensional layer and is fully attributed to the three near degenerated t2g d-orbitals close to a d7 filling configuration in the d-shell of CoJNi atoms. The electronic structure meets the necessary criteria for unconventional high Tc materials proposed recently by us to unify the two known high-Tc families, cuprates and iron-based superconductors. We predict that they host superconducting states with a d-wave pairing symmetry with Tc potentially higher than those of iron-based superconductors. These materials, if realized, can be a fertile new ground to study strongly correlated electronic Physics and provide decisive evidence for superconducting pairing mechanism.

关键词： Iron-based superconductors Cuprates d-Wave pairing symmetry Cobalt chalcogenides

Novel quasi-one-dimensional chromium-based unconventional superconductors

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Science Bulletin 2015年第24期60卷 2140-2141页

作者： jiangping hu Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences

Both unconventional high-temperature superconductors,cuprate-and iron-based superconductors,carry quasi-twodimensional(Q2D)electronic structures that are attributed to the 3d electrons of the transition metal elements... 详细信息

关键词：下线服务迁移

A solution strategy for distributed uncertain economic dispatch problems via scenario theory

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Control Theory and Technology 2021年第4期19卷 499-506页

作者： Peng Li jiangping hu School of Automation Engineering University of Electronic Science and Technology of ChinaChengduSichuan 611731China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

In this paper,an uncertain economic dispatch problem(EDP)is considered for a group of coopertive ***,let each agent extract a set of samples(scenarios)from the uncertain set,and then a scenario EDP is obtained using these *** on the scenario theory,a prior certifcation is provided to evaluate the probabilistic feasibility of the scenario solution for uncertain *** facilitate the computational task,a distributed solution strategy is proposed by the alternating direction method of multipliers(ADMM)and a fnite-time consensus ***,the distributed strategy can solve the scenario problem over a weight-balanced directed ***,the proposed solution strategy is applied to an EDP for a power system involving wind power plants.

关键词： Distributed system Economic dispatch problem Uncertain parameter Scenario theory

COOPERATIVE SHIFT ESTIMATION OF TARGET TRAJECTORY USING CLUSTERED SENSORS

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Journal of Systems Science & Complexity 2014年第3期27卷 413-429页

作者： hu jiangping hu Xiaoming SHEN Tielong School of Automation Engineering University of Electronic Science and Technology of China Optimization and Systems Theory and ACCESS Linnaeus Center Royal Institute of TechnologyStockholmSweden Department of Engineering and Applied Sciences Sophia UniversityTokyoJapan

In this paper,a mathematical model for target tracking using nonlinear scalar range sensors is formulated first.A time-shift sensor scheduling strategy is addressed on the basis of a k-barrier coverage protocol and all the sensors are divided into two classes of clusters,active cluster,and submissive cluster,for *** two types of time-shift nonlinear filters are proposed for both active and submissive clusters to estimate the trajectory of the moving target with disturbed *** stochastic stability of the two filters is ***,some numerical simulations are given to demonstrate the effectiveness of the new filters with a comparison of EKF.

关键词： Cluster sensor network target tracking time-shift estimation

Robustness of s-wave pairing symmetry in iron-based superconductors and its implications for fundamentals of magnetically driven high-temperature superconductivity

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Frontiers of physics 2016年第5期11卷 79-89页

作者： jiangping hu Jing Yuan Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics Purdue University West Lafayette IN 47907 USA Collaborative Innovation Center of Quantum Matter Beijing 100871 China

Based on the assumption that the superconducting state belongs to a single irreducible representation of lattice symmetry, we propose that the pairing symmetry in all measured iron-based superconductors is generally consistent with the A1g s-wave. Robust s-wave pairing throughout the different families of iron-based superconductors at different doping regions signals two fundamental principles behind high-To superconducting mechanisms：（i） the correspondence principle： the short-range magnetic-exchange interactions and the Fermi surfaces act collaboratively to achieve high-Tc superconductivity and determine pairing symmetries; （ii） the magnetic-selection pairing rule： supercon- ductivity is only induced by the magnetic-exchange couplings from the super-exchange mechanism through cation-anion-cation chemical bonding. These principles explain why unconventional high- Tc superconductivity appears to be such a rare but robust phenomena, with its strict requirements regarding the electronic environment. The results will help us to identify new electronic structures that can support high-Tc superconductivity.

关键词： iron-based superconductors cuprates unconventional superconductivity high-temperature superconductors