Physics of $π$-Meson Condensation and High Temperature Cuprate Superconductors

Details Physics of $π$-Meson Condensation and High Temperature Cuprate Superconductors Physics of $π$-Meson Condensation and High Temperature Cuprate Superconductors

2009-05-17

arxiv.org/abs/0905.2717v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The idea of condensation of the Goldstone $\pi$-meson field in nuclear matter had been put forward a long time ago. However, it was established that the normal nuclear density is too low, it is not sufficient to condensate $\pi$-mesons. This is why the $\pi$-condensation has never been observed. Recent experimental and theoretical studies of high temperature cuprate superconductors have revealed condensation of Goldstone magnons, the effect fully analogous to the $\pi$-condensation. The magnon condensation has been observed. It is clear now that quantum fluctuations play a crucial role in the condensation, in particular they drive a quantum phase transition that destroys the condensate at some density of fermions.

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