Google Scholar: How to search by author's email?
See my answer to a related question here. Basically, Google (and seemingly also Google Scholar) appears to strip the at sign from the search query. 

Unfortunately, I think this means Google Scholar is the wrong tool for this kind of search. Some of the better paywalled databases (such as Web of Science or Scopus) allow filtering by affiliation. You can check with your university librarians what resources you have access to.