deletions | additions       diff --git a/When_applied_an_electric_field__.tex b/When_applied_an_electric_field__.tex  index e6e7502..d97870a 100644  --- a/When_applied_an_electric_field__.tex  +++ b/When_applied_an_electric_field__.tex 
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\frac{d^{2}\phi}{dt^{2}} + \Gamma \frac{d\phi}{dt} + 2k_F V_0 sin(2k_F \phi) =\frac{e E_0}{m}cos(\omega t)  \end{equation}  where \Gamma is the damping coefficient determined by experiment and m is the collective mass of CDW. By changing parameters in equation (5), one can obtain the "diode-like" conductance of depinned CDW.