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Article
Open AccessARPES detection of superconducting gap sign in unconventional superconductors
The superconducting gap symmetry is crucial in understanding the underlying superconductivity mechanism. Angle-resolved photoemission spectroscopy (ARPES) has played a key role in determining the gap symmetry ...
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Article
Open AccessOrbital-dependent electron correlation in double-layer nickelate La3Ni2O7
The latest discovery of high temperature superconductivity near 80 K in La3Ni2O7 under high pressure has attracted much attention. Many proposals are put forth to understand the origin of superconductivity. The d...
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Article
Nodal s± pairing symmetry in an iron-based superconductor with only hole pockets
The origin of high-temperature superconductivity in iron-based superconductors is still not understood; determination of the pairing symmetry is essential for understanding the superconductivity mechanism. In ...
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Article
Electronic origin of high superconducting critical temperature in trilayer cuprates
In high-temperature cuprate superconductors, the superconducting transition temperature (Tc) depends on the number of CuO2 planes in the structural unit and the maximum Tc is realized in the trilayer system. Tril...
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Article
Open AccessObservation of flat band, Dirac nodal lines and topological surface states in Kagome superconductor CsTi3Bi5
Kagome lattices of various transition metals are versatile platforms for achieving anomalous Hall effects, unconventional charge-density wave orders and quantum spin liquid phenomena due to the strong correlat...
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Open AccessElectronic nature of charge density wave and electron-phonon coupling in kagome superconductor KV3Sb5
The Kagome superconductors AV3Sb5 (A = K, Rb, Cs) have received enormous attention due to their nontrivial topological electronic structure, anomalous physical properties and superconductivity. Unconventional cha...
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Article
Open AccessSpectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO3 films
Single-layer FeSe films grown on the SrTiO3 substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (Tc) and distinct electronic structures. H...
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Article
Open AccessMomentum-resolved visualization of electronic evolution in do** a Mott insulator
High temperature superconductivity in cuprates arises from do** a parent Mott insulator by electrons or holes. A central issue is how the Mott gap evolves and the low-energy states emerge with do**. Here w...
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Article
13 W continuous-wave intracavity frequency-doubled Nd:YAP/LBO laser at 670.8 nm
We report on a high-power continuous-wave (CW) intracavity frequency-doubled laser at 670.8 nm, which is produced by the second-harmonic generation of a diode side-pumped Nd:YAP crystal laser with a type-II no...
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Article
Electronic structure of exfoliated millimeter-sized monolayer WSe2 on silicon wafer
The monolayer WSe2 is interesting and important for future application in nanoelectronics, spintronics and valleytronics devices, because it has the largest spin splitting and longest valley coherence time among ...
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Article
Open AccessInvestigation of return photons from sodium laser beacon excited by a 40-watt facility-class pulsed laser for adaptive optical telescope applications
The brightness of the artificial beacon is one critical performance parameter for adaptive optics. Here, a 40-watt level narrow-linewidth microsecond pulsed yellow laser is produced at 589 nm with a high repet...
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Article
Open AccessElectronic evidence of temperature-induced Lifshitz transition and topological nature in ZrTe5
The topological materials have attracted much attention for their unique electronic structure and peculiar physical properties. ZrTe5 has host a long-standing puzzle on its anomalous transport properties manifest...
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Article
In situ carrier tuning in high temperature superconductor \(\hbox {Bi}_2\hbox {Sr}_2\hbox {CaCu}_2\hbox {O}_{8+\varvec{\delta} }\) by potassium deposition
We report a successful tuning of the hole do** level over a wide range in high temperature superconductor $$\hbox {Bi}_2\hbox {Sr}_2...
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Open AccessCommon electronic origin of superconductivity in (Li,Fe)OHFeSe bulk superconductor and single-layer FeSe/SrTiO3 films
The mechanism of high-temperature superconductivity in the iron-based superconductors remains an outstanding issue in condensed matter physics. The electronic structure plays an essential role in dictating sup...
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Article
Open AccessAnomalous High-Energy Waterfall-Like Electronic Structure in 5 d Transition Metal Oxide Sr2IrO4 with a Strong Spin-Orbit Coupling
The low energy electronic structure of Sr2IrO4 has been well studied and understood in terms of an effective Jeff = 1/2 Mott insulator model. However, little work has been done in studying its high energy electro...
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Article
Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films
The latest discovery of possible high-temperature superconductivity in the single-layer FeSe film grown on a SrTiO3 substrate has generated much attention. Initial work found that, while the single-layer FeSe/SrT...
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Article
Open AccessEvidence of Topological Surface State in Three-Dimensional Dirac Semimetal Cd3As2
The three-dimensional topological semimetals represent a new quantum state of matter. Distinct from the surface state in the topological insulators that exhibits linear dispersion in two-dimensional momentum p...
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Article
Open AccessStrong Anisotropy of Dirac Cones in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
The Dirac materials, such as graphene and three-dimensional topological insulators, have attracted much attention because they exhibit novel quantum phenomena with their low energy electrons governed by the re...
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Orbital-selective spin texture and its manipulation in a topological insulator
Topological insulators represent a new quantum state of matter that are insulating in the bulk but metallic on the edge or surface. In the Dirac surface state, it is well-established that the electron spin is ...
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Disappearance of nodal gap across the insulator–superconductor transition in a copper-oxide superconductor
The parent compound of the copper-oxide high-temperature superconductors is a Mott insulator. Superconductivity is realized by do** an appropriate amount of charge carriers. How a Mott insulator transforms i...
