Collective photon emission and ferroelectric exciton ordering near Mott insulating state in WSe2/WS2 heterobilayers
L.M. Devenica, Z. Hadjri, J. Kumlin, D. Suárez-Forero, R. Li, K. Domi, B. Lyu, W. Li, L. Fausten, V. Vento, N. Ubrig, S. Liu, J. Hone, K. Watanabe, T. Taniguchi, T. Pohl, and A. Srivastava