This is exactly what I want to do:

Do you know any papers utilizing reinforcement learning (RL) techniques to build recommender systems?

I only know these:

An MDP-Based Recommender System
Usage-based web recommendations: a reinforcement learning approach

On the one side it is intuitively correct to apply RL in this area, but on the other side it is hard to test RL models build in the university ivory tower. Hence it would not surprise me if there aren’t any more papers.