New scenario for high-Tc cuprates: electronic topological transition as a motor for anomalies in the underdoped regime
F. Onufrieva, P. Pfeuty, M. Kiselev
Abstract
We have discovered a new nontrivial aspect of electronic topological transition (ETT) in a 2D free fermion system on a square lattice. The corresponding exotic quantum critical point, δ=δc, T=0, (n=1-δis an electron concentration) is at the origin of anomalous behaviour in the interacting system on one side of ETT, δ<δc. The most important is an appearance of the line of characteristic temperatures, T*(δ) δc-δ. Application of the theory to high-Tc cuprates reveals a striking similarity to the observed experimentally behaviour in the underdoped regime (NMR and ARPES).
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