Details

Autor(en) / Beteiligte

• Song, Fei
• Yao, Shunyu
• Wang, Zhong

Titel

Non-Hermitian Topological Invariants in Real Space

Ist Teil von

• Physical review letters, 2019-12, Vol.123 (24), p.246801-246801, Article 246801

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2019

Quelle

PROLA

Beschreibungen/Notizen

• The topology of non-Hermitian systems is drastically shaped by the non-Hermitian skin effect, which leads to the generalized bulk-boundary correspondence and non-Bloch band theory. The essential part in formulations of bulk-boundary correspondence is a general and computable definition of topological invariants. In this Letter, we introduce a construction of non-Hermitian topological invariants based directly on real-space wave functions, which provides a general and straightforward approach for determining non-Hermitian topology. As an illustration, we apply this formulation to several representative models of non-Hermitian systems, efficiently obtaining their topological invariants in the presence of non-Hermitian skin effect. Our formulation also provides a dual picture of the non-Bloch band theory based on the generalized Brillouin zone, offering a unique perspective of bulk-boundary correspondence.