Guang-Ming Zhang

Tsinghua University

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Lu Yu

University of Science and Technology of China

Feng-Feng Song

The University of Tokyo

Xiaoli Dong

Chinese Academy of Sciences

Guoyi Zhu

University of Hong Kong

Kui Jin

University of Chinese Academy of Sciences

Jianqi Li

Chinese Academy of Sciences

Jie Yuan

Chinese Academy of Sciences

Tao Xiang

Chinese Academy of Sciences

Huaixin Yang

Chinese Academy of Sciences

Yayu Wang

Tsinghua University

Cooperative Institutions

Chinese Academy of Sciences

125

Institute of Physics

University of Chinese Academy of Sciences

Tsinghua University

National Laboratory for Superconductivity

Czech Academy of Sciences, Institute of Physics

Zhejiang University

Istituto Nazionale di Fisica Nucleare

Songshan Lake Materials Laboratory

Peking University

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Anomalous Resonance of the Symmetric Single-Impurity Anderson Model in the Presence of Pairing Fluctuations

Physical Review Letters (1998)

Guang-Ming Zhang Lu Yu

We consider the symmetric single-impurity Anderson model in the presence of pairing fluctuations. In the isotropic limit, the degrees of freedom of the local impurity are separated into hybridizing and non-hybridizing modes. The self-energy for the hybridizing modes can be obtained exactly, leading to two subbands centered at $\pm U/2$. For the non-hybridizing modes, the second order perturbation yields a singular resonance of the marginal Fermi liquid form. By multiplicative renomalization, the self-energy is derived exactly, showing the resonance is pinned at the Fermi level, while its strength is weakened by renormalization.

Anderson impurity model

10.1103/physrevlett.81.4192

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Citations (2)

Discovery of a bi-critical point between antiferromagnetic and superconducting phases in pressurized single crystal Ca0.73La0.27FeAs2

arXiv (Cornell University) (2016)

Yazhou Zhou Shan Jiang Qi Wu V. A. Sidorov Jing Guo

One of the most strikingly universal features of the high temperature superconductors is that the superconducting phase emerges in the close proximity of the antiferromagnetic phase, and the interplay between these two phases poses a long standing challenge. It is commonly believed that,as the antiferromagnetic transition temperature is continuously suppressed to zero, there appears a quantum critical point, around which the existence of antiferromagnetic fluctuation is responsible for the development of the superconductivity. In contrast to this scenario, we report the discovery of a bi-critical point identified at 2.88 GPa and 26.02 K in the pressurized high quality single crystal Ca0.73La0.27FeAs2 by complementary in situ high pressure measurements. At the critical pressure, we find that the antiferromagnetism suddenly disappears and superconductivity simultaneously emerges at almost the same temperature, and that the external magnetic field suppresses the superconducting transition temperature but hardly affects the antiferromagnetic transition temperature.

Critical point (mathematics)

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A comparison of robust Bayesian and LVQ neural network for visual uniformity recognition of nonwovens

Textile Research Journal (2011)

Jianli Liu Baoqi Zuo Xianyi Zeng Philippe Vroman Besoa Rabénasolo

The visual uniformity recognition of nonwoven materials using image analysis and neural network is a typical application of pattern recognition in textile industry. In this paper, we try to find a solution to this problem by combining the generalized Gaussian density (GGD) model in wavelet domain and two types of neural networks, robust Bayesian and learning vector quantization (LVQ) neural network. The proposed model is constituted with two stages, i.e., texture representation and pattern recognition. For texture representation, each image is decomposed into four levels using the 9-7 bi-orthogonal wavelet base. The wavelet coefficients in each subband are independently modelled by the GGD model. Moreover, taken as textural features, the corresponding scale and shape parameters estimated from the wavelet coefficients distribution with the maximum likelihood (ML) estimation are extracted in order to train and test the neural network for visual uniformity classification. During the pattern recognition part, robust Bayesian neural network and LVQ neural network are used as classifier. Especially, the experiments based on robust Bayesian neural network are taken as the key point. Experimental results indicate that the robust Bayesian neural network perform superiorly.

Learning vector quantization

10.1177/0040517510391696

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Quantum Monte Carlo simulations on interaction effects in the 2D Kane-Mele-Hubbard model

Bulletin of the American Physical Society (2011)

Dong Zheng Congjun Wu Guang-Ming Zhang

Bose–Hubbard model

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d-wave superconductivity induced by short-range antiferromagnetic correlations in the two-dimensional Kondo lattice model

Physical Review B (2012)

Yu Liu Huan Li Guang-Ming Zhang Lu Yu

The possible heavy fermion superconductivity is carefully reexamined in the two-dimensional Kondo lattice model with an antiferromagnetic Heisenberg superexchange between local magnetic moments. To establish an effective mean field theory in the limit of paramagnetic heavy Fermi liquid and near the half-filling case, we find that the spinon singlet pairing from the local antiferromagnetic short-range correlations can reduce the ground state energy substantially. In the presence of the Kondo screening effect, the Cooper pairs between the conduction electrons are induced. Depending on the ratio of the Heisenberg and the Kondo exchange couplings, the resulting superconducting state is characterized by either a $d$-wave nodal or $d$-wave nodeless state, and a continuous phase transition exists between these two states. These results are related to some quasi-two-dimensional heavy fermion superconductors.

10.1103/physrevb.86.024526

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Weak ferromagnetism with the Kondo screening effect in the Kondo lattice systems

Physical Review B (2013)

Yu Liu Guang-Ming Zhang Lu Yu

We carefully consider the interplay between ferromagnetism and the Kondo screening effect in the conventional Kondo lattice systems at finite temperatures. Within an effective mean-field theory for small conduction electron densities, a complete phase diagram has been determined. In the ferromagnetic ordered phase, there is a characteristic temperature scale to indicate the presence of the Kondo screening effect. We further find two distinct ferromagnetic long-range ordered phases coexisting with the Kondo screening effect: spin fully polarized and partially polarized states. A continuous phase transition exists to separate the partially polarized ferromagnetic ordered phase from the paramagnetic heavy Fermi liquid phase. These results may be used to explain the weak ferromagnetism observed recently in the Kondo lattice materials.

Kondo insulator

Lattice (music)

10.1103/physrevb.87.134409

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Citations (27)

Topologically distinct classes of valence-bond solid states with their parent Hamiltonians

Physical Review B (2009)

Hong-Hao Tu Guang-Ming Zhang Tao Xiang Zheng-Xin Liu Tai-Kai Ng

We present a general method to construct one-dimensional translationally invariant valence-bond solid states with a built-in Lie group $G$ and derive their matrix product representations. The general strategies to find their parent Hamiltonians are provided so that the valence-bond solid states are their unique ground states. For quantum integer-spin-$S$ chains, we discuss two topologically distinct classes of valence-bond solid states: one consists of two virtual $SU(2)$ spin-$J$ variables in each site and another is formed by using two $SO(2S+1)$ spinors. Among them, a spin-1 fermionic valence-bond solid state, its parent Hamiltonian, and its properties are discussed in detail. Moreover, two types of valence-bond solid states with $SO(5)$ symmetries are further generalized and their respective properties are analyzed as well.

Generalized valence bond

Hamiltonian (control theory)

10.1103/physrevb.80.014401

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Citations (36)

Local quantum critical behavior in magnetic Kondo impurity models with partially screened moment

arXiv (Cornell University) (2004)

Guang-Ming Zhang Yu Lu

In the strong coupling limit, an effective resonant level model is derived for the spin-1 underscreened Kondo impurity model. A local quantum critical behavior is induced by the formation of a bound state with partially screened magnetic moment, displaying a residual $Z_2$ symmetry, leading to a $\delta $-resonance at the Fermi level in the impurity spectral function. As a consequence, a logarithmic singularity appears in the real part of the impurity dynamic spin susceptibility as a function of $\max (\omega, T)$, with $\omega $ as frequency, $T$ temperature. A small magnetic field breaks this $Z_2$ symmetry and suppresses the singularity. We also discuss the possible manifestation of such a quantum critical behavior in the spin-1/2 two Kondo impurity model and the single quantum dot system with even electron occupation.

Magnetic impurity

Anderson impurity model

Kondo model

10.48550/arxiv.cond-mat/0412561

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Asymptotically exact solution of a local copper-oxide model

Unknown eBooks (1994)

Guang-Ming Zhang Yu Lu

We present an asymptotically exact solution of a local copper-oxide model abstracted from the multiband models. The phase diagram is obtained through the renormalization-group analysis of the partition function. In the strong coupling regime, we find an exactly solved line, which crosses the quantum critical point of the mixed valence regime separating two different Fermi-liquid (FL) phases. At this critical point, a many-particle resonance is formed near the chemical potential, and a marginal-FL spectrum can be derived for the spin and charge susceptibilities.

Critical line

Critical point (mathematics)

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Behavior of magnetic impurities in d-wave superconductors

Physica C Superconductivity (2000)

Ming Shaw Guang-Ming Zhang Zhongxian Zhao

Decoupling (probability)

Coupling constant

Constant (computer programming)

10.1016/s0921-4534(00)00736-x

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