Impact of Surface Charge Depletion on the Free Electron Nonlinear Response of Heavily Doped Semiconductors

  title={Impact of Surface Charge Depletion on the Free Electron Nonlinear Response of Heavily Doped Semiconductors},
  author={Federico De Luca and Cristian Cirac{\`i}},
  journal={Physical Review Letters},
We propose surface modulation of the equilibrium charge density as a technique to control and enhance, via an external static potential, the free electron nonlinear response of heavily doped semiconductors. Within a hydrodynamic perturbative approach, we predict a two order of magnitude boost of free electron third-harmonic generation. 

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