The Dichotomy between Nodal and Antinodal Quasiparticles in Underdoped (La${}_{2-x}$Sr${}_x$)CuO${}_4$ Superconductors

X. J. Zhou, T. Yoshida, D. -H. Lee +13

High resolution angle-resolved photoemission measurements on underdoped (La${}_{2-x}$Sr${}_x$)CuO${}_4$ system show that, at energies below 70 meV, the quasiparticle peak is well defined…