Entanglement and ground state level crossings in an extended Hubbard dimer

Authors

Robertson C. Esperanza; Francis N. C. Paraan

Source

Proceedings of the 34th Samahang Pisika ng Pilipinas Physics Congress, University of the Philippines Visayas, Iloilo City, SPP-2016-PB-20 (2016).

Abstract

The single-site entanglement entropy in the ground state of an extended Hubbard dimer is calculated in terms of intrasite and intersite interaction parameters. Entanglement vanishes in a ferromagnetic regime characterized by a degenerate spin-polarized ground state. In parameter ranges with non-zero entanglement, the ground state is a linear combination of states with spin and charge modulation.