You cannot use ampersand. Workaround it however you like best, use a different symbol, a phrase, a semi-colon, whatever suits you.
AS for the question of aliases it has nothing to do with multiple authors. If I were you, I'd use the following scheme:
1) Store only real names in the authors column
2) Create a secondary column with aliases for the authors, if any
3) Create a grouped search term that allows searching both those columns at once (see preferences->Search)
Personally, I just always use real names and make a note about the book having been published under a pseudonym in the comments.
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