Discrete time crystal made of topological edge magnons
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 i...
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/171746 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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