Reversal of quantised Hall drifts at non-interacting and interacting topological boundaries
arxiv(2023)
摘要
The transport properties of gapless edge modes at boundaries between
topologically distinct domains are of fundamental and technological importance.
Therefore, it is crucial to gain a better understanding of topological edge
states and their response to interparticle interactions. Here, we
experimentally study long-distance quantised Hall drifts in a harmonically
confined topological pump of non-interacting and interacting ultracold
fermionic atoms. We find that quantised 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 corresponds to a band
transfer between a band with Chern number C = +1 and a band with C = -1 via
a gapless edge mode, in agreement with the bulk-edge correspondence for
non-interacting particles. We establish that a non-zero repulsive Hubbard
interaction leads to the emergence of an additional edge in the system, relying
on a purely interaction-induced mechanism, in which pairs of fermions are
split.
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