Overriding a specific view mode html.tpl.php template
As I am sure you know, the teaser view is only/mostly used when a list of nodes are put together, eg, the promoted to front page listing, a View listing, etc.

So, let's say you have a View page listing the most recent Articles, and it's sitting at www.yourhost.com/recent/articles, you could override the html.tpl.php there by creating a html--recent-articles.tpl.php file in your theme and modifying it accordingly.

Views itself also allows the use of node templates when a node is presented in a listing; if that is what you are needing or requiring, the template files there are along the lines of node-view-VIEWNAME.tpl.php.