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Title:

Fractional corner charges in a two-dimensional superlattice Bose-Hubbard model

Document type:
Zeitschriftenaufsatz
Author(s):
Bibo, Julian; Lovas, Izabella; You, Yizhi; Grusdt, Fabian; Pollmann, Frank
Abstract:
We study higher order topology in the presence of strong interactions in a two-dimensional, experimentally accessible superlattice Bose-Hubbard model with alternating hoppings and strong on-site repulsion. We evaluate the phase diagram of the model around half-filling using the density renormalization group ansatz and find two gapped phases separated by a gapless superfluid region. We demonstrate that the gapped states realize two distinct higher order symmetry protected topological phases, whic...     »
Journal title:
Physical Review B 2020-07
Year:
2020
Journal volume:
102
Journal issue:
4
Fulltext / DOI:
doi:10.1103/physrevb.102.041126
Publisher:
American Physical Society (APS)
E-ISSN:
2469-99502469-9969
Date of publication:
30.07.2020
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