Taught by Pol van Hoften . Notes by Hanson Hao and Wenqi Li can be found here . Please remind me to update the newest version.
### References

- Six lectures on Deligne-Lusztig theory by Raphael Rouquier.
- The original paper "Representations of reductive groups over finite fields" by Deligne and Lusztig (available here).
- An introduction to Deligne-Lusztig theory by Teruyoshi Yoshida
- A roadmap for learling Deligne-Lusztig theory on mathoverflow
- "Representations of SL_2(F_q)", by Bonnafe (available here)
- "Representations lineaires des groupes finis algebriques" or Serre's Bourbaki report on the work of Deligne and Lusztig is available here.