Observation of a symmetry-protected topological phase in external
magnetic fields
- URL: http://arxiv.org/abs/2208.05357v2
- Date: Thu, 11 Aug 2022 02:55:37 GMT
- Title: Observation of a symmetry-protected topological phase in external
magnetic fields
- Authors: Zhihuang Luo, Wenzhao Zhang, Xinfang Nie, Dawei Lu
- Abstract summary: We report the real-space observation of a symmetry-protected topological phase with interacting nuclear spins.
We probe the interaction-induced transition between two topologically distinct phases, both of which are classified by many-body Chern numbers.
Our findings enable direct characterization of topological features of quantum many-body states through gradually decreasing the strength of the introduced external fields.
- Score: 1.4515101661933258
- License: http://creativecommons.org/publicdomain/zero/1.0/
- Abstract: Topological phases have greatly improved our understanding of modern
conception of phases of matter that go beyond the paradigm of symmetry breaking
and are not described by local order parameters. Instead, characterization of
topological phases requires the robust topological invariants, whereas
measuring these global quantities presents an outstanding challenge for
experiments, especially in interacting systems. Here we report the real-space
observation of a symmetry-protected topological phase with interacting nuclear
spins, and probe the interaction-induced transition between two topologically
distinct phases, both of which are classified by many-body Chern numbers
obtained from the dynamical response to the external magnetic fields. The
resulting value of Chern number ($\bar{\mathcal{C}h} = 1.958 \pm 0.070$)
demonstrates the robust ground state degeneracy, and also determines the number
of nontrivial edge states. Our findings enable direct characterization of
topological features of quantum many-body states through gradually decreasing
the strength of the introduced external fields.
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