Cheng Hu

Spin excitations and flat electronic bands in a Cr-based kagome superconductor

Zehao Wang, Yucheng Guo, H. Y. Huang, Fang Xi Xie et autres

In the quest for topology- and correlation-driven quantum states, kagome lattice materials have garnered significant interest for their band structures, featuring flat bands (FBs) from the quantum destructive interference of the electronic wavefunction. Tuning an FB to the chemical potential could induce …

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Spectral evidence for local-moment ferromagnetism in the van der Waals metals Fe3GaTe2 and Fe3GeTe2

Han Wu, Chaowei Hu, Yaofeng Xie, Bo Gyu Jang et autres

Magnetism in two-dimensional (2D) materials has attracted considerable attention recently for both fundamental understanding of magnetism and its tunability towards device applications. The isostructural ${\mathrm{Fe}}_{3}{\mathrm{GeTe}}_{2}$ and ${\mathrm{Fe}}_{3}{\mathrm{GaTe}}_{2}$ are two members of the Fe-based van der Waals (vdW) ferromagnet family, but exhibit very …

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Atomically smooth films of CsSb: A chemically robust visible light photocathode

C. T. Parzyck, C. A. Pennington, William J. I. DeBenedetti, Jan Balajka et autres

Alkali antimonide semiconductor photocathodes provide a promising platform for the generation of high-brightness electron beams, which are necessary for the development of cutting-edge probes, including x-ray free electron lasers and ultrafast electron diffraction. Nonetheless, to harness the intrinsic brightness limits in these …

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Tunable Van Hove Singularity without Structural Instability in Kagome Metal CsTi 3 Bi 5

Bo Liu, Min-Quan Kuang, Yang Luo, Yongkai Li et autres

In kagome metal ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$, multiple intertwined orders are accompanied by both electronic and structural instabilities. These exotic orders have attracted much recent attention, but their origins remain elusive. The newly discovered ${\mathrm{CsTi}}_{3}{\mathrm{Bi}}_{5}$ is a Ti-based kagome metal to parallel ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$. Here, we …

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Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals Fe$_3$GaTe$_2$ and Fe$_3$GeTe$_2$

Han Wu, Chaowei Hu, Yaofeng Xie, Bo Gyu Jang et autres

Magnetism in two-dimensional (2D) materials has attracted considerable attention recently for both fundamental understanding of magnetism and their tunability towards device applications. The isostructural Fe$_3$GeTe$_2$ and Fe$_3$GaTe$_2$ are two members of the Fe-based van der Waals (vdW) ferromagnet family, but exhibit very …

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Atomically smooth films of CsSb: a chemically robust visible light photocathode

C. T. Parzyck, C. A. Pennington, William J. I. DeBenedetti, Jan Balajka et autres

Alkali antimonide semiconductor photocathodes provide a promising platform for the generation of high brightness electron beams, which are necessary for the development of cutting-edge probes including x-ray free electron lasers and ultrafast electron diffraction. However, to harness the intrinsic brightness limits in …

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Non‐Local Electrostatic Gating Effect in Graphene Revealed by Infrared Nano‐Imaging

Aolin Deng, Cheng Hu, Peiyue Shen, Jiajun Chen et autres

Electrostatic gating lies in the heart of field effect transistor (FET) devices and modern integrated circuits. To achieve efficient gate tunability, the gate electrode has to be placed very close to the conduction channel, typically a few nanometers. Remote control of a …

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Electronic structure examination of the topological properties of CaMnSb2 by angle-resolved photoemission spectroscopy

Hongtao Rong, Liqin Zhou, Junbao He, Chunyao Song et autres

We have carried out detailed high-resolution angle-resolved photoemission spectroscopy measurements and band structure calculations to study the electronic structure of $\mathrm{Ca}\mathrm{Mn}{\mathrm{Sb}}_{2}$. The observed Fermi surface mainly consists of one hole pocket around the $\mathrm{\ensuremath{\Gamma}}$ point and one tiny hole pocket at the …

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Experimental study on fatigue strength of airport concrete pavement slab

Cheng Hu, Xingzhong Weng, Jun Zhang, Wei Xu et autres

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Electronic Evolution from the Parent Mott Insulator to a Superconductor in Lightly Hole-Doped Bi2Sr2CaCu2O8 + δ*

Qiang Gao, Lin Zhao, Cheng Hu, Hongtao Yan et autres

High temperature superconductivity in cuprates is realized by doping the Mott insulator with charge carriers. A central issue is how such an insulating state can evolve into a conducting or superconducting state when charge carriers are introduced. Here, by in situ vacuum …

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Selective hybridization between the main band and the superstructure band in the Bi2Sr2CaCu2O8+δ superconductor

Qiang Gao, Hongtao Yan, Jing Liu, Ping Ai et autres

Unexpected hybridization between the main band and the superstructure band in the Bi${}_{2}$Sr${}_{2}$CaCu${}_{2}$O${}_{8+\ensuremath{\delta}}$ (Bi2212) superconductor is revealed by high-resolution laser-based angle-resolved photoemission measurements. It can be understood by considering the selective hybridization of bands from the bilayer splitting in Bi2212. These observations …

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Nonlinear uniaxial pressure dependence of Tc in iron-based superconductors

Zhaoyu Liu, Yanhong Gu, Wenshan Hong, Tao Xie et autres

This paper investigates the uniaxial pressure $p$ dependence of the superconducting transition temperature ${T}_{c}$ in iron-based superconductors. The nonlinear p dependence of ${T}_{c}$ displays a pronounced in-plane anisotropy, which is similar to the anisotropic response of the resistivity to $p$. The authors …

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