So I'm applying to materials science at Stanford, considering research in energy. I'd say my primary interest is energy harvesting, and my secondary interest is energy storage.
I'm in the middle of writing my SOP, and I realize how specific mine is. So far, I've mentioned a professor who does research in energy harvesting, which is something I'm very interested in. I've contacted this professor, and he responded rather positively, saying I can mention him in my application. In my SOP, I've talked about my interest and have mentioned this professor, and I think I've shown how strong I feel about this topic, but I'm aware that I'm putting myself at risk by mentioning only one professor.
Should I also write about my secondary interest, so that I don't seem like that applicant who is interested in only one professor? It's also another topic I'd like to work in, thanks to a previous internship I found to be a valuable experience. I'm worried how this might be construed as me still exploring and undecided between what could be two varied interests.