Citation:
Sun, L. ; Wang, C. - Y. ; Krasnok, A. ; Choi, J. ; Shi, J. ; Gomez-Diaz, J. S. ; Zepeda, A. ; Gwo, S. ; Shih, C. - K. ; Alù, A. ; et al. Separation of valley excitons in a MoS 2 monolayer using a subwavelength asymmetric groove array. Nature Photonics 13, 180. Copy at http://www.tinyurl.com/2avcuyu6