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

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

1998-04-17

arxiv.org/abs/cond-mat/9804189v2

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevLett.82.2370

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, \delta=\delta_c, T=0, (n=1-\delta is an electron concentration) is at the origin of anomalous behaviour in the interacting system on one side of ETT, \delta<\delta_c. The most important is an appearance of the line of characteristic temperatures, T^*(\delta) \propto \delta_c-\delta. 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).

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