Detecting quantum critical points in the t-[Formula: see text] Fermi-Hubbard model via complex network theory.

ABSTRACT: A considerable success in phenomenological description of [Formula: see text] superconductors has been achieved within the paradigm of Quantum Critical Point (QCP)-a parental state of a variety of exotic phases that is characterized by dense entanglement and absence of well-defined quasiparticles. However, the microscopic origin of the critical regime in real materials remains an open question. On the other hand, there is a popular view that a single-band t-[Formula: see text] Hubbard model is the minimal model to catch the main relevant physics of superconducting compounds. Here, we suggest that emergence of the QCP is tightly connected with entanglement in real space and identify its location on the phase diagram of the hole-doped t-[Formula: see text] Hubbard model. To detect the QCP we

SUBMITTER: Bagrov AA 

PROVIDER: S-EPMC7686386 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature