1. an example of flat-band many body localization

Yoshihito Kuno

University of Tsukuba, Japan

4 August 2020 Tue 3 pm

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

Many body localization (MBL) phenomena are attracted in condensed matter community. MBL possesses rich physical contents compared to Anderson localization. A lot of studies have been reported. So far, the conventional MBL is believed to occur in disordered system, i.e., system without translational symmetry, but one asks a question whether MBL occurs in some clean systems with translational invariance, i.e, disorder-free MBL. In this talk, I want to report one example of such a disorder-free MBL. It is a complete flat-band system with interactions, called the flat-band Creutz ladder. I numerically verified the typical properties of the MBL in the flat-band Creutz ladder with interactions. The statistical properties exhibit the tendency of the existence of MBL and ergodicity-breaking dynamics is numerically verified.