The label "atheist" refers to one thing, a belief in God. Generally, that means we don't believe in a supernatural and intelligent creator of the universe. However, that does not limit the atheist in any other way. Atheists can believe in reincarnation, ghosts, aliens, etc. whatever.
However, most atheists attach the same standard of evidence and reason to the supernatural that they do to God. And, just like the belief in God, there is no real reason or evidence to support claims of the supernatural. The 'evidence' for the supernatural is either anecdotal, faked, and/or cannot be verified.