16,835 research outputs found

    Electron-doped phosphorene: A potential monolayer superconductor

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    We predict by first-principles calculations that the electron-doped phosphorene is a potential BCS-like superconductor. The stretching modes at the Brillouin-zone center are remarkably softened by the electron-doping, which results in the strong electron-phonon coupling. The superconductivity can be introduced by a doped electron density (n2Dn_{2D}) above 1.3×10141.3 \times10^{14} cm−2^{-2}, and may exist over the liquid helium temperature when n2D>2.6×1014n_{2D}>2.6 \times10^{14} cm−2^{-2}. The maximum critical temperature is predicted to be higher than 10 K. The superconductivity of phosphorene will significantly broaden the applications of this novel material

    Nuclear modification factor in intermediate-energy heavy-ion collisions

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    The transverse momentum dependent nuclear modification factors (NMF), namely RCPR_{CP}, is investigated for protons produced in Au + Au at 1AA GeV within the framework of the isospin-dependent quantum molecular dynamics (IQMD) model. It is found that the radial collective motion during the expansion stage affects the NMF at low transverse momentum a lot. By fitting the transverse mass spectra of protons with the distribution function from the Blast-Wave model, the magnitude of radial flow can be extracted. After removing the contribution from radial flow, the RCPR_{CP} can be regarded as a thermal one and is found to keep unitary at transverse momentum lower than 0.6 GeV/c and enhance at higher transverse momentum, which can be attributed to Cronin effect.Comment: 8 pages, 5 figures; aceepted by Physics Letters
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