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The normal state of cuprate superconductors exhibits many exotic behaviorsqualitatively different from the Fermi liquid, the foundation of condensedmatter physics. Here we demonstrate that non-Fermi liquid behaviors emergenaturally from scattering against an emergent Bose liquid. Particularly, wefind a finite zero-energy scattering rate at low-temperature limit that growslinearly with respect to temperature, against clean fermions' genericnon-dissipative characteristics. Surprisingly, three other seemingly unrelatedexperimental observations are also produced, including the well-studied "kink"in the quasi-particle dispersion, as well as the puzzling correspondencesbetween the normal and superconducting state. Our findings provide a generalroute for fermionic systems to generate non-Fermi liquid behavior, and suggeststrongly that by room temperature the doped holes in the cuprates have alreadyformed an emergent Bose liquid of tightly bound pairs, whose low-temperaturecondensation gives unconventional superconductivity.

physical review. b./physical review. b

Non-Fermi liquid scattering against an emergent Bose liquid:  manifestations in the kink and other exotic quasiparticle behaviors in the  normal-state cuprate superconductors