imprint:
American Association for the Advancement of Science (AAAS), 2024
Published in:Science
Language:
English
DOI:
10.1126/science.adg3848
ISSN:
0036-8075;
1095-9203
Origination:
Footnote:
Description:
<jats:p>
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
<jats:italic>C</jats:italic>
= +1 and another with
<jats:italic>C</jats:italic>
= –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.
</jats:p>