New scenario for high-T_c cuprates: electronic topological transition as a motor for anomalies in the underdoped regime

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=δ_c, 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<δ_c. The most important is an appearance of the line of characteristic temperatures, T^*(δ) \propto δ_c-δ. Application of the theory to high-T_c cuprates reveals a striking similarity to the observed experimentally behaviour in the underdoped regime (NMR and ARPES).

4 pages, RevTeX, 5 EPS figures included, to be published in Physical Review Letters vol 82, March 15, 1999

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