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It has recently been conjectured that the transport relaxation rate in metals is bounded above by the temperature of the system. In this work, we discuss the transport phenomenology of overdoped electron-doped cuprates, which we show constitute an unambiguous counterexample to this putative Planckian bound, raising serious questions about the efficacy of the bound.
Materials with strongly-correlated electrons exhibit interesting phenomena such as metal-insulator transitions and high-temperature superconductivity. In stark contrast to ordinary metals, electron transport in these materials is thought to resemble
Could it be that the matter from the electrons in high Tc superconductors is of a radically new kind that may be called many body entangled compressible quantum matter? Much of this text is intended as an easy to read tutorial, explaining recent theo
High temperature thermal transport in insulators has been conjectured to be subject to a Planckian bound on the transport lifetime $tau gtrsim tau_text{Pl} equiv hbar/(k_B T)$, despite phonon dynamics being entirely classical at these temperatures. W
The room temperature thermal diffusivity of high T$_c$ materials is dominated by phonons. This allows the scattering of phonons by electrons to be discerned. We argue that the measured strength of this scattering suggests a converse Planckian scatter
We present a lattice model of fermions with $N$ flavors and random interactions which describes a Planckian metal at low temperatures, $T rightarrow 0$, in the solvable limit of large $N$. We begin with quasiparticles around a Fermi surface with effe