Symmetry-protected topological corner modes in a periodically driven interacting spin lattice

Kelvin Koor, Raditya Weda Bomantara, Leong Chuan Kwek

Research output: Contribution to journalArticlepeer-review


Periodic driving has a longstanding reputation for generating exotic phases of matter with no static counterparts. This work explores the interplay between periodic driving, interaction effects, and Z2 symmetry that leads to the emergence of Floquet symmetry protected second-order topological phases in a simple but insightful two-dimensional spin-1/2 lattice. Through a combination of analytical and numerical treatments, we verify the formation of corner-localized 0 and π modes, i.e., Z2 symmetry broken operators that commute and anticommute, respectively, with the one-period time evolution operator, as well as establish the topological nature of these modes by demonstrating their presence over a wide range of parameter values and explicitly deriving their associated topological invariants under special conditions. Finally, we propose a means to detect the signature of such modes in experiments, and we discuss the effect of imperfections.

Original languageEnglish
Article number195122
JournalPhysical Review B
Issue number19
StatePublished - 15 Nov 2022

Bibliographical note

Funding Information:
R.W.B. is supported by the Australian Research Council Centre of Excellence for Engineered Quantum Systems (EQUS, CE170100009). K.K. and L.C.K. are supported by the Ministry of Education and the National Research Foundation under the Center for Quantum Technologies (CQT).

Publisher Copyright:
© 2022 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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