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Reversal of quantized Hall drifts at noninteracting and interacting topological boundaries
Zijie Zhu1, Marius Gächter1, Anne-Sophie Walter1
1Institute for Quantum Electronics & Quantum Center, ETH Zurich, 8093 Zurich, Switzerland.
Abstract:
The transport properties of gapless edge modes at boundaries between topologically distinct domains are of fundamental and technological importance. We experimentally studied long-distance quantized Hall drifts in a harmonically confined topological pump of ultracold fermionic atoms. We found that quantized drifts halt and reverse their direction when the atoms reach a critical slope of the confining potential, revealing the presence of a topological boundary. The drift reversal corresponded to a band transfer between a band with Chern number C = +1 and another with C = -1 through a gapless edge mode, in agreement with the bulk-edge correspondence for noninteracting particles. Nonzero repulsive Hubbard interactions led to the emergence of an additional edge in the system through a mechanism in which pairs of fermions are split.
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