2017/09/26 by E. G. C. P. van Loon, E G C P van Loon, M. I. Katsnelson +1
Physics and Astronomy · #Boson #Checkerboard #Cold Atom Physics and Bose-Einstein Condensates #Duality (order theory) #Hubbard model #Phase (matter) #Phase diagram #Physics of Superconductivity and Magnetism #Quantum many-body systems #cond-mat.str-el
paper · pdf · doi:10.1088/1742-6596/1136/1/012006
published as J. Phys.: Conf. Ser., 1136, 012006 (2018) · To be submitted to the proceedings of CCP2017, to appear in Journal of Physics Conference Series (IOP); comments are welcome
openalex created_date 2017/09/25 · arxiv created 2017/09/26 · openalex publication_date 2018/12/01 · arxiv updated 2019/02/15 · openalex updated_date 2026/08/06
We discuss the phase diagram of the extended Hubbard model with both attractive and repulsive local and nonlocal interactions. The extended dynamical mean-field theory (EDMFT) and the dual boson method (DB) are compared. The latter contains additional nonlocal correlation effects that are not incorporated in EDMFT. We find that EDMFT and DB give almost identical results in the attractive V regime, where phase separation occurs. This is quite a difference with the previously studied repulsive V regime, where EDMFT and DB give very different phase boundaries for the checkerboard order phase, especially at small U .