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Spectra of Cosmic Rays (CRs), particularly their features, may hold essentialinformation about astroparticle and fundamental physics. Realizing that both$4$ PeV CR knee and electron's TeV break have nearly identical Lorentz factor,i.e. $\gamma \sim 10^6$, we propose that both CR nuclei and electron experiencea threshold interaction with unknown light particle $\rm X$, widespread in thediffusive halo. The interaction occurs only when the Lorentz factor of CRs islarger than $10^6$. Via this process, the energy spectrum of each component hasdeformation above the threshold Lorentz factor, so both knee and spectral breakof electrons can be naturally reproduced. Given the large uncertainties of theavailable measurements and simplified assumption, our model accommodates a widemass range of the particle X, which is allowable from ultralight value to $\sim1$ eV.

On the PeV knee of cosmic rays spectrum and TeV cutoff of electron spectrum