I have Marie Curie in mind, but she's not really a physicist, is she? otherwise I'll think about doing Gail Gulledge Hanson, even though I don't have a clue who she is.
marie curie was also a bit of a chemisist, but that shouln't really matter i think. She is however, the most obvious choice, (~ there is much information about her)
No, no, Aki. Choose a more controversial figure - like Lise Meitner, who was completely ignored by the Nobel Committee who awared the Nobel Prize in physics to her colleague Otto Hahn - for HER discoveries.
...or if you could write about an astronomr, Cecilia Payne would be a great choice. She was the one who discovered that hydrogen was the most abundant element in the universe, and that our sun had to contain huge amounts of it in order to work: