Fine Details of the Nodal Electronic Excitations in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$

T. Valla, T. E. Kidd, J. D. Rameau +5

Very high energy resolution photoemission experiments on high quality samples of optimally doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ show new features in the low-energy electronic excita…