Paramagnon-induced dispersion anomalies in the cuprates
R.S. Markiewicz, S. Sahrakorpi, and A. Bansil (Northeastern, University, Boston)
TL;DR
This paper investigates how paramagnons influence electronic dispersion anomalies in cuprate superconductors by analyzing magnetic susceptibilities within a Hubbard model, revealing energy scales linked to observed waterfall effects.
Contribution
It provides a theoretical explanation for dispersion anomalies in cuprates based on paramagnon interactions within a Hubbard model framework.
Findings
Strong magnetic spectral weight at specific energies in Bi2201 and NCCO.
Dispersion anomalies consistent with observed waterfall effects.
Energy scales around 360 meV and 640 meV linked to paramagnon activity.
Abstract
We report the self-energy associated with RPA magnetic susceptibility in the hole-doped Bi_2Sr_2CuO_6 (Bi2201) and the electron-doped Nd_{2-x}Ce_xCuO_4 (NCCO) in the overdoped regime within the framework of a one-band Hubbard model. Strong weight is found in the magnetic spectrum around (pi, 0) at about 360 meV in Bi2201 and 640 meV in NCCO, which yields dispersion anomalies in accord with the recently observed `waterfall' effects in the cuprates.
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