I am trying ot write a paper in RMarkdown pdf. But I dont know how to use special characters like \"İ, ı, ğ, ü, ö\". Those characters are present in Turkish. I can easily us
rmarkdown uses LaTeX to create the PDF, so you should be able to just use LaTeX markup. As an example:
--- title: "Test" output: pdf_document --- This is a special character: \u{g}.
Also, depending on the particular characters, you may be able to just type them in as-is (see, for example, here).