Table 1 Quantized Berry phase differences between two groundstates in generalized Su–Schrieffer–Heeger (SSH) models

From: Quantized polarization and Majorana fermions beyond tenfold classification

 

Berry phase difference

SSH

Ď€

RM

0.61Ď€

A

Ď€

AI

Ď€

AII

(π, π)

  1. All cases, except for the Rice-Mele (RM) domain wall, exhibit quantized values of π and manifest zero-energy domain-wall states, consistent with the principles of the extended bulk-boundary correspondence. The corresponding distributions of Berry curvature can be found in Figs. 2d–f and S1c, f for SSH, RM, AI, A, and AII domain walls, respectively. For the spinful AII class, two values enclosed in parentheses represent results for individual up and down spins.
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