Momentum dependent scaling exponents of cuprate strange-metal self energies: ARPES meets semi-holography

Speaker: Mark Golden – Amsterdam University

Host: QuMat

Abstract:

ARPES enables the precise experimental determination of the electronic self-energy as we present here from the strange metal single-layer cuprate (Pb,Bi)_2Sr_(2−x)La_xCuO_(6+δ) overa wide range in w- and T for k along the nodal direction. Constant energy cuts through the spectral function (MDCs) show a non-Lorentzian lineshape as k increases away from kF: the nodal self-energy is k dependent. These experimental data provide a new test for aspiring theories.

The self energy extracted from experiment is captured remarkably well by a power law that smoothly evolves with hole doping with – crucially – a k-dependent scaling exponent. In fact, this description emerges naturally from AdS/CFT-based semi-holography, putting a spotlight on holographic methods for the quantitative modelling of strongly interacting quantum materials like the cuprate strange metals [1].

[1] S. Smit et al., arxiv.org/pdf/2112.06576.