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arXiv · 2512.12746

Anomalous topological phases in a Chern insulator connected to leads in a cylindrical geometry

Satyam Sinha·Rekha Kumari·Junaid Majeed Bhat·Abhishek Dhar·Diptiman Sen·R. Shankar
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Abstract

The observed robustly quantized Hall conductance in quantum Hall systems and Chern insulators (CI) is normally understood in terms of the bulk topology of isolated systems, not coupled to leads. It is assumed that the leads act as inert reservoirs. Within a model of a CI coupled to leads with a cylindrical geometry, we show that this is not always true. We identify the Hall conductance with a boundary invariant, the winding number of the phase of the reflection coefficient. We find anomalous topological phases where the boundary invariant is not the same as the bulk Chern number, even in the limit of weak lead coupling.

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Satyam Sinha, Rekha Kumari, Junaid Majeed Bhat, Abhishek Dhar, Diptiman Sen, R. Shankar. 2025-12-14. Anomalous topological phases in a Chern insulator connected to leads in a cylindrical geometry. https://arxiv.org/abs/2512.12746

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