Gang Li

Hong Kong Polytechnic University

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Lü Li

University of Michigan–Ann Arbor

Tomoya Asaba

Los Alamos National Laboratory

Luis Balicas

National High Magnetic Field Laboratory

Benjamin Lawson

University of Michigan–Ann Arbor

Colin Tinsman

University of Michigan–Ann Arbor

W. Z. Hu

Boston University

P. Zheng

Chinese Academy of Sciences

Z. Li

Chinese Academy of Sciences

Fan Yu

Nanjing University

Genfu Chen

Czech Academy of Sciences, Institute of Physics

Cooperative Institutions

Chinese Academy of Sciences

543

University of Chinese Academy of Sciences

315

Institute of Physics

260

Institute of High Energy Physics

129

Czech Academy of Sciences, Institute of Physics

115

National Laboratory for Superconductivity

106

University of Science and Technology of China

Nanjing University

Songshan Lake Materials Laboratory

Peking University

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The metal–insulator-like and insulator–metal-like behaviors in antimony

Journal of Physics Condensed Matter (2008)

Z. Li Gang Li N L Wang Jiao Lian Luo

The resistivity and Hall resistivity of semimetallic antimony were measured from 2 to 300 K in magnetic fields up to 14 T. We found that in low field, the resistivity shows metallic behavior. In a modest field, the resistivity decreases to a minimum and then increases with decreasing temperature, showing a metal-insulator-like transition. In high field, the resistivity drops at low temperatures, showing an insulator-metal-like transition. The metal-insulator-like behavior can be explained by the competition of zero field resistivity and magneto-resistance, which is reciprocal to the zero field resistivity. The insulator-metal-like behavior can be explained by the imbalance of two carrier densities which changes the magneto-resistance from being reciprocal to proportional to the zero field resistivity.

Metal–insulator transition

10.1088/0953-8984/20/23/235232

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Citations (7)

Superconductivity and Signatures of Nontrivial Topology in the Layered Compound Ca₂Pd₃Sb₄

Chemistry of Materials (2024)

Xiaoping Ma Ningning Wang Xiangyu Zeng Lu Zhang Wentao Wang

Superconductivity in low-dimensional compounds has attracted considerable interest. In this study, we report a new layered Pd-based type-II superconductor, Ca2Pd3Sb4, which contains CaPd2Sb3 of CaBe2Ge2 blocks and CaPdSb of CeMg2Si2 blocks that are stacked alternately along the crystallographic c axis. The measured electrical resistivity, magnetic susceptibility, and specific heat of the Ca2Pd3Sb4 crystals, which are grown via a self-flux method, consistently demonstrate bulk superconductivity at about 1.30 K. Further analyses of the data indicate strong anisotropic behavior with the parameter γ ∼ 3.8 along the ab plane and c axis. Longitudinal magnetotransport measurements up to ∼18 T reveal notable Shubnikov–de Haas oscillations with a single frequency (F = 462 T), demonstrating the existence of an electron pocket in the Brillouin zone. First-principles calculation reveals that the metallicity of the compound with a quasi-two-dimensional Fermi surface and the d orbitals of Pd and p orbitals of Sb are the main contributors to the total density of states at the Fermi level in Ca2Pd3Sb4.

10.1021/acs.chemmater.3c02964

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CCDC 948690: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Bingbing Shi Li Li Pengfei Yuan Gang Li

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc10v5xy

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Two-dimensional superconductivity in a bulk superlattice van der Waals material Ba6Nb11Se28

Physical Review Materials (2022)

Ke Ma Shifeng Jin Fanqi Meng Qinghua Zhang Ruijin Sun

The observation of clean 2D superconductivity and bosonic Landau levels below 0.85 K in superlattice van der Waals material ${\mathrm{Ba}}_{6}{\mathrm{Nb}}_{11}{\mathrm{S}}_{28}$ have received much interest. Here we report the crystal structure, Hall resistivity, and 2D superconductivity of its sister compound, ${\mathrm{Ba}}_{6}{\mathrm{Nb}}_{11}{\mathrm{Se}}_{28}$. The atomic-resolution transmission electron microscopy images reveal an alternate stacking of $2H\text{\ensuremath{-}}{\mathrm{NbSe}}_{2}$ with a 3 \ifmmode\times\else\texttimes\fi{} 3 commensurate block layer, which is isostructural to ${\mathrm{Ba}}_{6}{\mathrm{Nb}}_{11}{\mathrm{S}}_{28}$ and with a larger $\mathrm{Nb}{X}_{2}$ ($X=\mathrm{S}$, Se) interlayer distance (12.8 \AA{}). Transport property measurements demonstrate a twofold enhancement in superconducting temperature $({{T}_{\mathrm{c}}}^{0}=2.2\phantom{\rule{0.16em}{0ex}}\mathrm{K})$, meanwhile the anisotropy in resistivity and carrier mobility in ${\mathrm{Ba}}_{6}{\mathrm{Nb}}_{11}{\mathrm{Se}}_{28}$ decrease drastically compared to its sulfur counterpart, driving the superconductor towards the dirty limit. Further measurements of angular-dependent upper critical field suggest the superconductivity in ${\mathrm{Ba}}_{6}{\mathrm{Nb}}_{11}{\mathrm{Se}}_{28}$ be Pauli-limit breaking (2 times the ${\ensuremath{\mu}}_{0}{H}_{P}$), and can be well described by the 2D Tinkham form. Our findings offer a valuable platform to investigate 2D superconductivity in bulk superlattice materials based on the transition-metal dichalcogenides.

Isostructural

Critical field

10.1103/physrevmaterials.6.044806

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Special ciphertext-only attack to double random phase encryption by plaintext shifting with speckle correlation

Journal of the Optical Society of America A (2017)

Shuming Jiao Gang Li Changyuan Zhou Wenbin Zou Xia Li

In this paper, a special ciphertext-only attack (COA) scenario to the traditional double random phase encoding (DRPE) technique is proposed based on plaintext shifting. We assume the attacker can illegally manipulate the DRPE system to gain multiple ciphertexts from randomly shifted versions of the same plaintext. The plaintext image can be recovered when our proposed scenario is combined with a speckle correlation attacking method proposed in previous work. Simulation results demonstrate that our proposed scheme can successfully crack the DRPE system even when the speckle correlation method alone fails to work in the conventional single ciphertext scenario due to the small size of the plaintext image. The work in this paper reveals a severe security flaw of DRPE systems when minor position shifting of the plaintext occurs.

Plain text

10.1364/josaa.35.0000a1

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Citations (35)

Anisotropic intermediate coupling superconductivity in Cu_0.03TaS₂

Journal of Physics Condensed Matter (2009)

Xiangde Zhu Yuping Sun Shu‐Hua Zhang Jianglong Wang Liang‐Jian Zou

The anisotropic superconducting state properties in Cu(0.03)TaS(2) have been investigated by magnetization, magnetoresistance and specific heat measurements. They clearly show that Cu(0.03)TaS(2) undergoes a superconducting transition at T(C) = 4.03 K. The obtained superconducting parameters demonstrate that Cu(0.03)TaS(2) is an anisotropic type-II superconductor. Combining specific heat jump ΔC/γ(n)T(C) = 1.6(4), gap ratio 2Δ/k(B)T(C) = 4.0(9) and the estimated electron-phonon coupling constant λ∼0.68, the superconductivity in Cu(0.03)TaS(2) is explained within the intermediate coupling BCS scenario. First-principles electronic structure calculations suggest that copper intercalation of 2H-TaS(2) causes a considerable increase of the Fermi surface volume and the carrier density, which suppresses the CDW fluctuation and favors the raise of T(C).

10.1088/0953-8984/21/14/145701

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4与非门4011特性及应用——触摸开关·触发报警器

电子制作 (2009)

Gang Li

数字集成电路有门电路，如非门（反相器）、与门、与非门、或门、或非门、异或门，还有其他的电路如触发器、计数器、锁存器、译码器等。数字集成电路通常用DIP封装，其外接电路一般有8脚、14脚、16脚、20脚、24脚；其中有两个脚接电源，其中一个是Vdd，接电源的正极；一个是Vss，接电源的负极。学习数字电路的最好方法是通过各种电路的实验、制作，进而认识和掌握它们的应用。从本期开始，将通过实验项目讲解，非门、与非门计数器等数字电路的应用。

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High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy

Journal of Physics Condensed Matter (2012)

N L Wang W. Z. Hu Zhiguo Chen R. H. Yuan Gang Li

We report optical spectroscopic measurements on electron- and hole-doped BaFe2As2. We show that the compounds in the normal state are not simple metals. The optical conductivity spectra contain, in addition to the free carrier response at low frequency, a temperature-dependent gap-like suppression at rather high energy scale near 0.6 eV. This suppression evolves with the As-Fe-As bond angle induced by electron- or hole-doping. Furthermore, the feature becomes much weaker in the Fe-chalcogenide compounds. We elaborate that the feature is caused by the strong Hund's rule coupling effect between the itinerant electrons and localized electron moment arising from the multiple Fe 3d orbitals. Our experiments demonstrate the coexistence of itinerant and localized electrons in iron-based compounds, which would then lead to a more comprehensive picture about the metallic magnetism in the materials.

Pseudogap

Optical conductivity

Magnetism

10.1088/0953-8984/24/29/294202

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Citations (43)

Large enhancement of magnetic damping in the presence of domain walls in spin valves

Journal of Physics D Applied Physics (2021)

Jian Su Wei He Gang Li He Bai Zhaozhao Zhu

Abstract Magnetic damping of the free layer of CoFeB in the spin valve IrMn/CoFe/Cu/CoFeB with large exchange bias has been characterized by frequency-swept ferromagnetic resonance under a series of fixed magnetic fields. The damping constant shows little difference between the parallel and antiparallel magnetization configurations, consistent with the theoretical prediction. Remarkably, in the intermediate states of the pinned CoFe layer under reversal, the effective damping constant of the CoFeB layer is significantly enhanced from 0.0119 up to 0.0292. This enhancement, exceeding the effect of the pumped spin current appreciably, is mainly due to the inhomogeneous broadening and/or two-magnon scattering caused by the stray field emerging from the domain walls (DW) of the pinned CoFe layer when its magnetization is partially reversed. Meanwhile, a resonance frequency shift is also observed in the presence of DW. Our result confirms the strong influence of the pinned layer DW on the magnetic damping in spin valves, which should be properly excluded while dealing with the nonlocal spin-transport-induced damping in heterostructures.

Spin valve

Magnetic damping

Spin pumping

Antiparallel (mathematics)

Magnetization reversal

Magnon

Domain wall (magnetism)

10.1088/1361-6463/abdce6

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