Greetings! I just finished my bachelor's degree in physics. I am now applying for a master's degree in physics. My bachelor's thesis was an experimental study about aerosol. I am planning to shift to theoretical physics. However, I want my topic to be related to materials science, specifically about alternative energy such as solar power, hydrogen storage, etc. I am just confused on where to start. Is there any problem/topic related to the above-mentioned where researchers are needed? Also, all theoretical materials science research articles I found involve computational techniques. Is it possible to do theoretical materials science using the typical pen and paper methods of theoretical physics (i.e. purely mathematical and not computational)? Thank you very much and sorry if the questions seem silly. I am not very sure on what I am talking about. Hehe.