Critical entanglement for the half-fIlled extended Hubbard model
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Citation (published version)Jon 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.99.195445
We 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.
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