Two-fluid model of the pseudogap of high-temperature cuprate superconductors based on charge- 2e bosons

Shiladitya Chakraborty, Philip Phillips

Research output: Contribution to journalArticlepeer-review

Abstract

Starting from the effective low-energy theory of a doped Mott insulator, obtained by exactly integrating out the high-energy scale, we show that the effective carrier density in the underdoped regime agrees with a two-fluid description. Namely, it has distinct temperature-independent and thermally activated components. We identify the thermally activated component as the bound state of a hole and a charge- 2e boson, which occurs naturally in the effective theory. The thermally activated unbinding of this state leads to the strange metal and subsequent T -linear resistivity. We find that the doping dependence of the binding energy is in excellent agreement with the experimentally determined pseudogap energy scale in cuprate superconductors.

Original languageEnglish (US)
Article number132505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number13
DOIs
StatePublished - Oct 30 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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