Spalding, JonTsai, Shan-WenCampbell, David K.2020-04-272020-04-272019-05-24Jon Spalding, Shan-Wen Tsai, David Campbell. 2019. "Critical Entanglement for the Half-FIlled Extended Hubbard Model." Physical Review B, Volume 99, https://doi.org/10.1103/PhysRevB.99.1954452469-9950https://hdl.handle.net/2144/40367We study the ground state of the one-dimensional extended Hubbard model at half filling using the entanglement entropy calculated by density matrix renormalization-group techniques. We apply curve fitting and scaling methods to accurately identify a second-order critical point as well as a Berezinskii-Kosterlitz-Thouless critical point. Using open boundary conditions and medium-sized lattices with very small truncation errors, we are able to achieve similar accuracy to that of previous authors. We also report observations of finite-size and boundary effects that can be remedied with careful pinning.en-US©2019 American Physical Society. The final published version of this article appears in OpenBU by permission of the publisher.Article10.1103/PhysRevB.99.1954450000-0002-4502-5629 (Campbell, David)424196