Submitted:
09 July 2019
Posted:
10 July 2019
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Abstract
Real-time evolution of the electron densities under excitations in La2CuO4 was calculated by the time-dependent density functional theory (TDDFT). The author found, for the first time, under excitations, the electron cloud of Cu2+ changes obviously and the characteristic frequencies are 83 meV and 36 meV, respectively, for two different modes. The results are unexpected and close to that of lattice vibrations. The results show that the electron cloud of Cu2+ (just like the lattice) can be the electron-pairing medium in high temperature copper oxide superconductors.
Keywords:
high temperature copper-oxide superconductors
; time-dependent density functional theory
; electron-pairing medium
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