"Tendencies of enhanced electronic nematicity in the Hubbard model and a comparison with Raman scattering on high-temperature superconductors"

Tianyi Liu: Daniel Jost, Brian Moritz, Edwin W. Huang, Rudi Hackl, and Thomas P. Devereaux; Physical Review B, 04/05/21.

Additional Authors: Daniel Jost, Brian Moritz, Edwin W. Huang, Rudi Hackl, and Thomas P. Devereaux

Abstract:

The pseudogap regime of the cuprate high-temperature superconductors is characterized by a variety of competing orders, the nature of which are still widely debated. Recent experiments have provided evidence for electron nematic order, in which the electron fluid breaks rotational symmetry while preserving translational invariance. Raman spectroscopy, with its ability to symmetry resolve low energy excitations, is a unique tool that can be used to assess nematic fluctuations and nematic ordering tendencies. Here we compare results from determinant quantum Monte Carlo simulations of the Hubbard model to experimental results from Raman spectroscopy in La2−xSrxCuO4, which show a prominent increase in the B1g response around 10% hole doping as the temperature decreases, indicative of a rise in nematic fluctuations at low energy. Our results support a picture of nematic fluctuations with B1g symmetry occurring in underdoped cuprates, which may arise from melted stripes at elevated temperatures.