Connection between the winding number and the Chern number

2019/08/19 by Han‐Ting Chen, Chen, Han-Ting, Chia‐Hsun Chang +3
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum many-body systems #Topological Materials and Phenomena

paper · pdf · doi:10.48550/arxiv.1908.06700

openalex publication_date 2019/08/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Bulk-edge correspondence is one of the most distinct properties of topological insulators. In particular, the 1D winding number \n has a one-to-one correspondence to the number of edge states in a chain of topological insulators with boundaries. By properly choosing the unit cells, we carry out numerical calculation to show explicitly in the extended SSH model that the winding numbers corresponding to the left and right unit cells may be used to predict the numbers of edge states on the two boundaries in a finite chain. Moreover, by drawing analogy between the SSH model and QWZ model, we show that the extended SSH model may be generalized to the extended QWZ model. By integrating the ``magnetic field'' over the momentum strip 0≤ p₂ ≤ π, 0≤ p₁ 2π in the Brillouin zone, we show a identity relating the 2D Chern number and the difference between the 1D winding numbers at p₂=0 and p₂ =π.

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