Quasiparticle dynamics across the full Brillouin zone of Bi2Sr2CaCu2O8+δ traced with ultrafast time and angle-resolved photoemission spectroscopy

• DOI: 10.1063/1.4933133
• Publication Date: 2015-10-13T16:15:07Z
• Authors: Georgi L. Dakovski; Tomasz Durakiewicz; Jian-Xin Zhu; Peter S. Riseborough; Genda Gu; Steve M. Gilbertson; Antoinette Taylor; George Rodriguez
• Keywords: Brillouin zone; Momentum (technical analysis)

A hallmark in the cuprate family of high-temperature superconductors is nodal-antinodal dichotomy. In this regard, angle-resolved photoemission spectroscopy (ARPES) has proven especially powerful, providing band structure information directly energy-momentum space. Time-resolved ARPES (trARPES) holds great promise adding ultrafast temporal information, an attempt to identify different interaction channels time domain. Previous studies cuprates using trARPES were handicapped by low probing energy, which significantly limits accessible momentum Using 20.15 eV, 12 fs pulses, we show for first evolution quasiparticles antinodal region Bi2Sr2CaCu2O8+δ and demonstrate that non-monotonic relaxation dynamics dominates above a certain fluence threshold. The heavily influenced transient modification electron-phonon phase space restrictions, stark contrast monotonic nodal off-nodal regions.