Zhengbin Gu
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View article: High pump depletion second-harmonic generation using domain engineered thin-film lithium niobate waveguides
High pump depletion second-harmonic generation using domain engineered thin-film lithium niobate waveguides Open
Thin-film lithium niobate (TFLN) has emerged as a powerful platform for integrated nonlinear optics owing to its large χ (2) nonlinearity, tight confinement and flexible tunability. To fully excavate such superior nonlinear optical propert…
View article: Electron-Hole Crossover in $\mathrm{La}_{3-x}\mathrm{Sr}_{x}\mathrm{Ni}_{2}\mathrm{O}_{7-δ}$ Thin Films
Electron-Hole Crossover in $\mathrm{La}_{3-x}\mathrm{Sr}_{x}\mathrm{Ni}_{2}\mathrm{O}_{7-δ}$ Thin Films Open
The ambient-pressure superconductivity in $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ thin films via compressive epitaxial strain provides a highly accessible platform for diverse characterization techniques, facilitating the studies of…
View article: Observation of superconductivity-induced leading-edge gap in Sr-doped $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ thin films
Observation of superconductivity-induced leading-edge gap in Sr-doped $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ thin films Open
The discovery of high-temperature superconductivity in pressurized bulk $\mathrm{La}_{3}\mathrm{Ni}_{2}\mathrm{O}_{7}$ has ignited significant interest in nickelate superconductors. Unlike cuprates, where superconductivity predominantly or…
View article: Superconductivity and phase diagram in Sr-doped La$_{3-x}$Sr$_{x}$Ni$_2$O$_7$ thin films
Superconductivity and phase diagram in Sr-doped La$_{3-x}$Sr$_{x}$Ni$_2$O$_7$ thin films Open
Recent studies have demonstrated ambient pressure superconductivity in compressively strained La$_{3}$Ni$_{2}$O$_{7}$ thin films, yet the phase diagram of heterovalent doping$-$critical for advancing the field$-$remains unexplored. Here, w…
View article: In Situ Preparation of Superconducting Infinite‐Layer Nickelate Thin Films with Atomically Flat Surface
In Situ Preparation of Superconducting Infinite‐Layer Nickelate Thin Films with Atomically Flat Surface Open
Since their discovery, the infinite‐layer nickelates have been regarded as an appealing system for gaining deeper insights into high‐temperature superconductivity (HTSC). However, the synthesis of superconducting samples has been proven to…
View article: Engineering of a charged incoherent BiFeO3/SrTiO3 interface
Engineering of a charged incoherent BiFeO3/SrTiO3 interface Open
Atomic-level control of complex oxide heterostructure interfaces has resulted in unprecedented properties and functionalities. The majority of oxide heterointerfaces being intensively investigated maintain lattice coherence and exhibit a f…
View article: Superconductivity in freestanding infinite-layer nickelate membranes
Superconductivity in freestanding infinite-layer nickelate membranes Open
The observation of superconductivity in infinite-layer nickelates has attracted significant attention due to its potential as a new platform for exploring high $ \mathrm{\textit{T}}_{c} $ superconductivity. However, thus far, superconducti…
View article: 4D-Explorer: A visual software for 4D-STEM data processing and image reconstruction
4D-Explorer: A visual software for 4D-STEM data processing and image reconstruction Open
With the development of high-speed electron detectors, four-dimensional scanning transmission electron microscopy (4D-STEM) has emerged as a powerful tool for characterizing microstructures in material science and life science. However, th…
View article: Synthesis of Chemically Sharp Interface in NdNiO<sub>3</sub>/SrTiO<sub>3</sub> Heterostructures
Synthesis of Chemically Sharp Interface in NdNiO<sub>3</sub>/SrTiO<sub>3</sub> Heterostructures Open
The nickel-based superconductivity provides a fascinating new platform to explore the high- T c superconductivity. As the infinite-layer nickelates are obtained by removing the apical oxygens from the precursor perovskite phase, the crysta…
View article: Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite‐Layer Lanthanum Nickelates
Evidence for Anisotropic Superconductivity Beyond Pauli Limit in Infinite‐Layer Lanthanum Nickelates Open
After being expected to be a promising analog to cuprates for decades, superconductivity has recently been discovered in infinite‐layer nickelates, providing new opportunities to explore mechanisms of high‐temperature superconductivity. Ho…
View article: Giant Switchable Persistent Photoconductivity in Soft Chemistry Reduced SrTiO<sub>3</sub>
Giant Switchable Persistent Photoconductivity in Soft Chemistry Reduced SrTiO<sub>3</sub> Open
High tunability of photoconductivity is highly desired for applications in optical memories, sensors, and bioelectronics. Recently, room temperature persistent photoconductivity (PPC) in SrTiO 3 (STO) has been revealed and has attracted gr…
View article: Uniaxial strain induced anisotropic bandgap engineering in freestanding BiFeO3 films
Uniaxial strain induced anisotropic bandgap engineering in freestanding BiFeO3 films Open
Strain engineering has been demonstrated to be an effective knob to tune the bandgap in perovskite oxides, which is highly desired for applications in optics, optoelectronics, and ferroelectric photovoltaics. Multiferroic BiFeO3 exhibits g…
View article: Evidence for quasi-two-dimensional superconductivity in infinite-layer nickelates
Evidence for quasi-two-dimensional superconductivity in infinite-layer nickelates Open
After being expected as a promising analogue to cuprates for decades, superconductivity was recently discovered in infinite-layer nickelates, providing new opportunities to explore mechanisms of high-temperature superconductivity. However,…
View article: A TiN@C core–shell support for improving Pt catalyst corrosion resistance
A TiN@C core–shell support for improving Pt catalyst corrosion resistance Open
TiN@C composite support with high corrosion resistance improves catalyst durability because of SMSI between the Pt and N site in TiN.
View article: Giant Thermal Transport Tuning at a Metal/Ferroelectric Interface
Giant Thermal Transport Tuning at a Metal/Ferroelectric Interface Open
Interfacial thermal transport plays a prominent role in the thermal management of nanoscale objects and is of fundamental importance for basic research and nanodevices. At metal/insulator interfaces, a configuration commonly found in elect…
View article: Impact of Cation Stoichiometry on the Crystalline Structure and Superconductivity in Nickelates
Impact of Cation Stoichiometry on the Crystalline Structure and Superconductivity in Nickelates Open
The recent discovery of superconductivity in infinite-layer nickelate films has aroused great interest since it provides a new platform to explore the mechanism of high-temperature superconductivity. However, superconductivity only appears…
View article: Epitaxial growth of Ruddlesden-Popper neodymium nickelates Nd$_{n+1}$Ni$_{n}$O$_{3n+1}$ (${n}$ = 1-5)
Epitaxial growth of Ruddlesden-Popper neodymium nickelates Nd$_{n+1}$Ni$_{n}$O$_{3n+1}$ (${n}$ = 1-5) Open
A series of Ruddlesden-Popper nickelates, Nd$_{n+1}$Ni$_{n}$O$_{3n+1}$ (${n}$ = 1-5), have been stabilized in thin film form using reactive molecular-beam epitaxy. High crystalline quality has been verified by X-ray diffraction and scannin…
View article: Giant Polarization and Abnormal Flexural Deformation in Bent Freestanding Perovskite Oxides
Giant Polarization and Abnormal Flexural Deformation in Bent Freestanding Perovskite Oxides Open
Recent realizations of ultrathin freestanding perovskite oxides offer a unique platform to probe novel properties in two-dimensional oxides. Here, we observed a giant flexoelectric response in freestanding BiFeO3 and SrTiO3 in their bent s…
View article: Epitaxial growth and electronic structure of Ruddlesden–Popper nickelates (La<i>n</i>+1Ni<i>n</i>O3<i>n</i>+1, <i>n</i> = 1–5)
Epitaxial growth and electronic structure of Ruddlesden–Popper nickelates (La<i>n</i>+1Ni<i>n</i>O3<i>n</i>+1, <i>n</i> = 1–5) Open
We report the epitaxial growth of Ruddlesden–Popper nickelates, Lan+1NinO3n+1, with n up to 5 by reactive molecular beam epitaxy. X-ray diffractions indicate high crystalline quality of these films, and transport measurements show strong d…
View article: Composition-sensitive electrical properties of charge nonstoichiometric 0.94Bi0.5+xNa0.5−xTiO<sub>3</sub>–0.06BaTiO<sub>3</sub> ceramics
Composition-sensitive electrical properties of charge nonstoichiometric 0.94Bi0.5+xNa0.5−xTiO<sub>3</sub>–0.06BaTiO<sub>3</sub> ceramics Open
Charge nonstoichiometric 0.94[Formula: see text][Formula: see text]TiO 3 –0.06BaTiO 3 (BNT-BT) ([Formula: see text]) ceramics were prepared and investigated. The depolarization temperature was dependent on composition and the ferroelectric…
View article: Chemically specific termination control of oxide interfaces via layer-by-layer mean inner potential engineering
Chemically specific termination control of oxide interfaces via layer-by-layer mean inner potential engineering Open
Creating oxide interfaces with precise chemical specificity at the atomic layer level is desired for the engineering of quantum phases and electronic applications, but highly challenging, owing partially to the lack of in situ tools to mon…
View article: Epitaxial growth of bronze phase titanium dioxide by molecular beam epitaxy
Epitaxial growth of bronze phase titanium dioxide by molecular beam epitaxy Open
Bronze phase titanium dioxide (TiO2-B) has an ideal open structure for applications in high-rate lithium-ion batteries, but high quality and water-free TiO2-B is difficult to synthesize since TiO2-B is energetically less stable compared to…
View article: Giant positive magnetoresistance in half-metallic double-perovskite Sr <sub>2</sub> CrWO <sub>6</sub> thin films
Giant positive magnetoresistance in half-metallic double-perovskite Sr <sub>2</sub> CrWO <sub>6</sub> thin films Open
Ferrimagnetic half-metallic Sr 2 CrWO 6 thin films show giant positive magnetoresistance up to 17,200%.
View article: Effect of Substrate symmetry on the dendrite morphology of MoS2 Film synthesized by CVD
Effect of Substrate symmetry on the dendrite morphology of MoS2 Film synthesized by CVD Open
In van der Waals epitaxial growth, the substrate plays a particularly important role in the crystal morphology. Here, we synthesized MoS 2 by chemical vapour deposition on silicon carbide (SiC). The obtained MoS 2 dendritic crystals show s…
View article: Lattice dynamics of K<i>x</i>RhO2 single crystals
Lattice dynamics of K<i>x</i>RhO2 single crystals Open
A series of crystals KxRhO2 (x = 0.72, 0.63, 0.55, 0.39, and 0.24) have been synthesized and their vibrational properties have been studied by first principles calculations, Raman spectroscopy, and inelastic neutron scattering. The measure…
View article: Erratum: Tunable semimetallic state in compressive-strained<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrIrO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>films revealed by transport behavior [Phys. Rev. B 91, 035110 (2015)]
Erratum: Tunable semimetallic state in compressive-strainedfilms revealed by transport behavior [Phys. Rev. B 91, 035110 (2015)] Open
We have noticed that a sentence, showing the condition for Eq.(1) satisfaction, was missing in our paper.Equation (1) for depicting the temperature dependence of the insulator regime caused by the two-dimensional weak localization is valid…