Discrete time crystal in the gradient-field Heisenberg model

Article

关键词: MANY-BODY LOCALIZATION;    SINGLE-ELECTRON SPIN;   

DOI  :  10.1103/PhysRevB.101.115303

来源: SCIE

【 摘 要 】

We show that time crystal phases, which are known to exist for disorder-based many-body localized systems, also appear in systems where localization is due to strong magnetic field gradients. Specifically, we study a finite Heisenberg spin chain in the presence of a gradient field, which can be realized experimentally in quantum dot systems using micromagnets or nuclear spin polarization. Our numerical simulations reveal time crystalline order over a broad range of realistic quantum dot parameters, as evidenced by the long-time preservation of spin expectation values and the asymptotic form of the mutual information. We also consider the undriven system and present several diagnostics for many-body localization that are complementary to those recently studied. Our results show that these nonergodic phases should be realizable in modest-sized quantum dot spin arrays using only demonstrated experimental capabilities.

【 授权许可】

Free