Wavelength Dependence of Pumping a Superconductor

Experiment [E. Casandruc et al] has shown transient enhanced superconductivity in LBCO when pumped by ultrafast pulses.This provides a new way to control the propertities of high Tc supercondoctors and explore non-equilibrium phenomenon. Here we explore the effects of pumping the cuprates at different wavelengths. The model is a multi-band Hubbard model (including apical oxygen sites), which we pump with an ultrafast gaussian-pulse to study its time evolution using exact diagonalization (ED). The results show that holes are pumped from the CuO₂ plane into the apical oxygens at characteristic optical wavelengths.