Crystalline equivalent boundary-bulk correspondence of two-dimensional topological phases

Dec 29, 2021
e-Print:

Citations per year

202220232024401
Abstract: (arXiv)
The boundary of topological phases of matter can manifest its topology nature, which leads to the so-called boundary-bulk correspondence (BBC) of topological phases. In this Letter, we construct a one-to-one correspondence between the boundary theories of fermionic SPT (fSPT) phases protected by crystalline symmetry and on-site symmetry in 2D fermionic systems, which follow the so-called crystalline equivalence principle. We dub such correspondence crystalline equivalent BBC. We illustrate this correspondence by two simple examples and as an application, we discover the topological boundary theory of 2D fSPT phase with spin-1/2 fermions, protected by a non-Abelian group Z4Z2T\mathbb{Z}_4\rtimes\mathbb{Z}_2^T with A4=T2=PfA^4=\mathcal{T}^2=P_f where AA is the generator of Z4\mathbb{Z}_4, from its crystalline equivalent partner -- 2D higher-order fSPT phase with spinless fermions, protected by D4D_4 symmetry.
Note:
  • 4+epsilon pages, 3 figures, with supplementary materials. Comments are welcome
  • phase: topological
  • fermion: spinless
  • group: nonabelian
  • dimension: 2
  • crystal
  • equivalence principle
  • topology
  • boundary condition
  • Z(4)