Laser-ARPES studies of dispersion kinks in cuprate phase diagram
ORAL
Abstract
Angle-resolved photoemission spectroscopy (ARPES) reveals ubiquitous dispersion kinks in cuprates which are manifestations of electron-boson coupling, potentially related to the superconductivity pairing mechanism. We report new temperature-, momentum-, and doping- dependent laser-ARPES measurements of the energy and coupling strength of the ubiquitous kink near 70 meV in Bi$_{\mathrm{2}}$Sr$_{\mathrm{2}}$CaCu$_{\mathrm{2}}$O$_{\mathrm{8+\delta }}$ (Bi-2212). The apparent kink energy below T$_{\mathrm{c}}$ is related to the mode energy modulo the maximum of the $d$-wave superconducting gap, and the pseudogap similarly needs to be considered above T$_{\mathrm{c}}$. Following improvements in data quality as well as recent comprehensive gap measurements throughout the phase diagram, we can better assess the phenomenology and origin of dispersion anomalies.
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