Direct observation of particle-hole mixing in the superconducting state by angle-resolved photoemission
arXiv:cond-mat/9602119 · doi:10.1103/PhysRevB.53.R14737
Abstract
Particle-hole (p-h) mixing is a fundamental consequence of the existence of a pair condensate. We present direct experimental evidence for p-h mixing in the angle-resolved photoemission (ARPES) spectra in the superconducting state of Bi_2Sr_2CaCu_2O_{8+δ}. In addition to its pedagogical importance, this establishes unambiguously that the gap observed in ARPES is associated with superconductivity.
3 pages, revtex, 4 postscript figures