Edge states in quantum spin chains: the interplay among interaction,
gradient magnetic field and Floquet engineering
- URL: http://arxiv.org/abs/2011.06164v4
- Date: Tue, 20 Jul 2021 13:37:20 GMT
- Title: Edge states in quantum spin chains: the interplay among interaction,
gradient magnetic field and Floquet engineering
- Authors: Wenjie Liu, Bo Zhu, Li Zhang, Yongguan Ke, Chaohong Lee
- Abstract summary: We explore the edge defects induced by spin-spin interaction in a finite paradigmatic Heisenberg spin chain.
The interplay between these two types of edge defects allows us to manipulate the magnon edge states from an isolated band into a continuum one.
Our study offers new insights to understand and control the magnon edge states governed by the interplay between edge defects induced by the spin-spin interaction and the Floquet-Wannier-Zeeman manipulation.
- Score: 11.419243482331034
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We explore the edge defects induced by spin-spin interaction in a finite
paradigmatic Heisenberg spin chain. By introducing a gradient magnetic field
and a periodically-modulated spin-exchange strength, the resonance between
modulation frequency and magnetic field gradient can also induce asymmetric
defects at the edges, dubbed as Floquet-Wannier-Zeeman edge defects. The
interplay between these two types of edge defects allows us to manipulate the
magnon edge states from an isolated band into a continuum one. In the
high-frequency regime, we analytically derive effective models to interpret the
formation mechanisms for edge states by employing the multiscale perturbation
analysis. Our study offers new insights to understand and control the magnon
edge states governed by the interplay between edge defects induced by the
spin-spin interaction and the Floquet-Wannier-Zeeman manipulation.
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