Universal 115meV Feature and High Energy Spectral Weight Transfer in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\Delta}$ Superconductor Revealed by Laser ARPES
ORAL
Abstract
Quasiparticle dispersion and spectral weight transfer have been investigated by laser-based angle-resolved photoemission spectroscopy in Bi$_2$Sr$_2$CaCu$_2$O$_{8+{\Delta}}$. A universal energy scale near $\sim$115meV can be clearly identified in superconducting state which is insensitive to momentum and doping levels. A concomitant observation with this energy scale is the spectral weight transfer over a large energy range when the sample goes from the normal state to the superconducting state. The origin and implications of these observations will be discussed.
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