Extended Data Fig. 5: Doping dependence of electronic rotons.
From: Electronic rotons and Wigner crystallites in a two-dimensional dipole liquid
a-f, ARPES data taken for black phosphorus doped by K at n marked on top of each panel in units of 1013 cm−2 with rs. We found the pseudogap of 71−107 meV persistent in the range of n.
