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We have discovered a new nontrivial aspect of electronic topologicaltransition (ETT) in a 2D free fermion system on a square lattice. Thecorresponding exotic quantum critical point, \delta=\delta_c, T=0, (n=1-\deltais an electron concentration) is at the origin of anomalous behaviour in theinteracting system on one side of ETT, \delta<\delta_c. The most important isan appearance of the line of characteristic temperatures, T^*(\delta) \propto\delta_c-\delta. Application of the theory to high-T_c cuprates reveals astriking similarity to the observed experimentally behaviour in the underdopedregime (NMR and ARPES).Comment: 4 pages, RevTeX, 5 EPS figures included, to be published in Physical  Review Letters vol 82, March 15, 199

physical review letters

New Scenario for High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Cuprates: Electronic Topological Transition as a Motor for Anomalies in the Underdoped Regime

New Scenario for High-TcCuprates: Electronic Topological Transition as a Motor for Anomalies in the Underdoped Regime