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

TL;DR

This paper proposes that an electronic topological transition (ETT) acts as a key driver for anomalies observed in underdoped high-T_c cuprates, linking quantum criticality to experimental phenomena.

Contribution

It introduces a new perspective on ETT as a fundamental mechanism behind anomalies in underdoped cuprates, supported by theoretical and experimental correlations.

Findings

Identification of a line of characteristic temperatures T^*(δ) related to ETT

Theoretical explanation of anomalies in NMR and ARPES data

Connection between quantum critical point and underdoped regime behavior

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, \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).