Symiton: Indispensable participator in electron-photon interactions and probably a kind of dark matter

Owing to the proposal of the concept of symiton, a new kind of matter assumed to play essential role in photoelectronics, the electron-photon interactions had been interpreted more reasonably and convincingly. In this paper, the indispensability of symitons' participation in the interactions is confirmed. And, it has been found that the behavior of symitons quite like that of dark matters.