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Title: Discrete time crystal made of topological edge magnons
Authors: Bhowmick, Dhiman
Sun, Hao
Yang, Bo
Sengupta, Pinaki
Keywords: Science::Physics
Issue Date: 2023
Source: Bhowmick, D., Sun, H., Yang, B. & Sengupta, P. (2023). Discrete time crystal made of topological edge magnons. Physical Review B, 108(1), 014434-1-014434-12.
Project: NRF-NRFF12-2020-0005 
Journal: Physical Review B 
Abstract: We report the emergence of time-crystalline behavior in the \pi-Berry phase protected edge states of a Heisenberg ferromagnet in the presence of an external driving field. The magnon amplification due to the external field spontaneously breaks the discrete time-translational symmetry, resulting in a discrete time crystal with a period that is twice that of the applied EM field. We discuss the nature and symmetry protection of the time crystalline edge states and their stability against various perturbations that are expected in real quantum magnets. We propose an experimental signature to unambiguously detect the time crystalline behavior and identify two recently discovered quasi-2D magnets as potential hosts. We present a first-of-its-kind realization of time crystals at topological edge states, which can be generalized and extrapolated to other bosonic quasi-particle systems that exhibit parametric pumping and topological edge states.
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.108.014434
Schools: School of Physical and Mathematical Sciences 
Rights: © 2023 American Physical Society. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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