Pseudogap-induced change in the nature of the Lifshitz transition in the two-dimensional Hubbard model

2025/09/11 by Aguiar, Maria C. O., Bragança, Helena, Paul, Indranil +1
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2509.09783

Abstract

We study the behavior of the density of states and the B_1g nematic susceptibility extracted from Raman response data across the doping-driven Lifshitz transition comparing the weak and strong interaction cases. Our results were obtained using cluster dynamical mean field theory for the two-dimensional Hubbard model. In the weakly correlated Fermi liquid regime, both quantities are approximately symmetric around the Lifshitz transition doping p_LT. In the strongly correlated regime, the low-doping pseudogap leads to an asymmetric, discontinuous evolution when the Fermi surface changes from hole-like to electron-like at p_LT. The Lifshitz transition thus changes character because it is tied to the pseudogap-Fermi-liquid transition. These results are consistent with available observations and should foster further experimental investigations.

Citations

• Unconventional superconductivity
• Investigation of Strongly Correlated Electron Systems with Cellular Dynamical Mean Field Theory

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