Theory of the Quantum Critical Fluctuations in Cuprate Superconductors
Vivek Aji, C. M. Varma
DOI 10.1103/PhysRevLett.99.067003 · Physical Review Letters
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Abstract
The statistical mechanics of the time-reversal and inversion symmetry breaking order parameter, possibly observed in the pseudogap region of the phase diagram of the cuprates, can be represented by the Ashkin-Teller model. We add kinetic energy and dissipation to the model for a quantum generalization and show that the spectrum of the quantum-critical fluctuations is of the form postulated in 1989 to give the marginal Fermi-liquid properties. The model solved and the methods devised are likely to be of interest also to other quantum phase transitions.
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