A unified form of low-energy nodal electronic interactions in hole-doped cuprate superconductors

Abstract

Using angle resolved photoemission spectroscopy measurements of Bi2Sr2CaCu2O8+δ over a wide range of doping levels, we present a universal form for the non-Fermi liquid electronic interactions in the nodal direction in the exotic normal state phase. It is described by a continuously varying power law exponent versus energy and temperature (hence named a Power Law Liquid or PLL), which with doping varies smoothly from a quadratic Fermi Liquid in the overdoped regime, to a linear Marginal Fermi Liquid at optimal doping, to a non-quasiparticle non-Fermi Liquid in the underdoped regime. The coupling strength is essentially constant across all regimes and is consistent with Planckian dissipation. Using the extracted PLL parameters we reproduce the experimental optics and resistivity over a wide range of doping and normal-state temperature values, including the T* pseudogap temperature scale observed in the resistivity curves. This breaks the direct link to the pseudogapping of antinodal spectral weight observed at similar temperature scales and gives an alternative direction for searches of the microscopic mechanism.

Crossover of Charge Fluctuations across the Strange Metal Phase Diagram

“…Such heterogeneity has even been proposed as the origin of the linear-in-T resistivity in strange metals [47]. Unfortunately, such a view of the M-EELS data is inconsistent with ARPES and STM studies, which report clearly dispersing quasiparticle excitations in Bi-2212 where the charge response is q-independent [15][16][17][18][19][20]. Moreover, recent RIXS experiments on electron-doped cuprates, which are not strange metals but have a similar degree of disorder [48], have clearly shown conventional dispersing plasmon excitations, in agreement with Hubbard model-based RPA calculations [49].…”

“…The quasiparticle dynamics of strange metals have been studied extensively with angle-resolved photoemission (ARPES) and scanning tunneling microscopy (STM) techniques, which directly measure the one-electron spec-tral function [15][16][17][18][19][20]. However, little is known about the two-particle charge response, which directly reveals the strongly correlated nature of this phase [21].…”

Anisotropic destruction of the Fermi surface in inhomogeneous holographic lattices

“…The horizon reflects the deep IR critical nature of the holographic systems [7,8]. The features of the near-horizon geometry in the bulk govern the unconventional non-Fermi liquid like phenomena in holographic models: these include the unusual power law self-energy of the excitations [5,43], the destruction of the Fermi surface due to translational symmetry breaking [24] and, for instance, the incoherent conductivity which behaves as a power law of temperature [44,45]. Our study shows that the anisotropic decoherence is the effect of the second kind, i.e.…”

Revised phase diagram of the high-$T_c$ cuprate superconductor Pb-doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ revealed by anisotropic transport measurements

“…( 1) and the incoherent to coherent crossover at T coh ≈ 200 K to interpret the temperature dependence of ρ ab (T ). Alternatively, the power law formula may also reproduce the observed ρ ab (T ) [56]. Another interpretation may be the achievement of the quantum mechanical constraint for the maximum scattering rate (Planckian dissipation limit) [13,51,57].…”