deletions | additions       diff --git a/When_applied_an_electric_field__.tex b/When_applied_an_electric_field__.tex  index 3409a38..e08f373 100644  --- a/When_applied_an_electric_field__.tex  +++ b/When_applied_an_electric_field__.tex 
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\omega_0 = 2k_F v  \end{equation}  The resonance of the applied AC field and CDW occurs at $\omega \approx \omega_0$, where the electric field shifts CDW by a distorted lattice spacing within one period. The resonance frequency is determined by the gap energy and also  the period of the potential.