Link to a different view mode from entity reference
a link: /some/somthing/here is just a link. It resolves to a resource on Drupal (see hook_menu).

A node by default lives at the url node/NID which shows the full view mode. You need Views, a Context, a Panel -- and a different url then node/NID to show a different view mode.

So yes ... you can make a different url to show a teaser. How you make the url is up to you.