Stripes, Antiferromagnetism, and the Pseudogap in the Doped Hubbard Model at Finite Temperature
Abstract
The interplay between thermal and quantum fluctuations controls the competition between phases of matter in strongly correlated electron systems. We study finitetemperature properties of the strongly coupled twodimensional doped Hubbard model using the minimally entangled typical thermal states method on widthfour cylinders. We discover that a phase characterized by commensurate shortrange antiferromagnetic correlations and no charge ordering occurs at temperatures above the halffilled stripe phase extending to zero temperature. The transition from the antiferromagnetic phase to the stripe phase takes place at temperature T /t ≈0.05 and is accompanied by a steplike feature of the specific heat. We find the singleparticle gap to be smallest close to the nodal point at k =(π /2 ,π /2 ) and detect a maximum in the magnetic susceptibility. These features bear a strong resemblance to the pseudogap phase of hightemperature cuprate superconductors. The simulations are verified using a variety of different unbiased numerical methods in the three limiting cases of zero temperature, small lattice sizes, and half filling. Moreover, we compare to and confirm previous determinantal quantum Monte Carlo results on incommensurate spindensity waves at finite doping and temperature.
 Publication:

Physical Review X
 Pub Date:
 July 2021
 DOI:
 10.1103/PhysRevX.11.031007
 arXiv:
 arXiv:2009.10736
 Bibcode:
 2021PhRvX..11c1007W
 Keywords:

 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 18 pages, 16 figures