Manifestation of the Berry connection in chiral lattice systems

• URL: http://arxiv.org/abs/2401.07946v1
• Date: Mon, 15 Jan 2024 20:19:07 GMT
• Title: Manifestation of the Berry connection in chiral lattice systems
• Authors: Francesco Di Colandrea, Nazanin Dehghan, Filippo Cardano, Alessio D'Errico, Ebrahim Karimi
• Abstract summary: We show that in chiral-symmetric processes the Berry connection determines an observable effect on the mean chiral displacement of delocalized wavefunctions. This finding is supported by a photonic experiment realizing a topological quantum walk, and demonstrates a new effect that can be attributed directly to the presence of a gauge field.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The Aharonov-Bohm effect is a physical phenomenon where the vector potential induces a phase shift of electron wavepackets in regions with zero magnetic fields. It is often referred to as evidence for the physical reality of the vector potential. A similar effect can be observed in solid-state systems, where the Berry connection can influence electron dynamics. Here, we show that in chiral-symmetric processes the Berry connection determines an observable effect on the mean chiral displacement of delocalized wavefunctions. This finding is supported by a photonic experiment realizing a topological quantum walk, and demonstrates a new effect that can be attributed directly to the presence of a gauge field.

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