Unique Berry phase in one-dimensional topological photonic systems
Journal
Optics Letters
Journal Volume
50
Journal Issue
3
Start Page
944
End Page
947
ISSN
0146-9592
1539-4794
Date Issued
2025-02-01
Author(s)
Abstract
A new concept, to the best of our knowledge, of the unique Berry phase (UBP) for identifying the topological nature of one-dimensional (1D) topological photonic systems is presented. The advantage of this concept compared to the typical Zak phase (TZP) is that the origin position can be chosen arbitrarily. Traditionally, there are always two inversion centers for a 1D binary photonic system with inversion symmetry. The TZP is quantized at either 0 or π if one of the inversion centers is selected as the origin. Its value depends on the choice of origin location of the unit cell. However, the dependence of the TZP on the choice of the inversion center leads to ambiguities in the distinguished topology. Moreover, when the origin position is not chosen to be in the center of inversion symmetry, the TZP cannot be quantized by integer multiples. A UBP is proposed to avoid this issue in advance. The quantitative value of the UBP is the same, regardless of which inversion center is selected as the origin. It can efficiently predict a topological phase change in a 1D photonic system called the unique Berry phase.
Subjects
Photonics
Topology
Berry's phase
Inversion center
Inversion symmetry
One-dimensional
Phase Change
Photonic systems
Quantitative values
Topological phase
Unit cells
article
controlled study
Photonic devices
Publisher
Optica Publishing Group
Type
journal article