Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A10: Driven Topological Systems - I
8:00 AM–11:00 AM,
Monday, March 4, 2024
Room: M100A
Sponsoring
Unit:
DCMP
Chair: Mainak Pal, University of Florida
Abstract: A10.00013 : Floquet topological superconductivity induced by chiral many-body interaction*
10:24 AM–10:36 AM
Presenter:
Sota Kitamura
(University of Tokyo)
Authors:
Sota Kitamura
(University of Tokyo)
Hideo Aoki
(University of Tokyo)
In particular, by controlling the band topology, a variety of topological phases can be realized dynamically, including Chern insulators.
While extending this idea to topological superconductivity is an important application, the same mechanism cannot be straightforwardly applied to typical superconductors.
The gap function is not directly coupled to the electromagnetic field, making it difficult to modulate the pairing symmetry and induce topological phase transitions.
In this study, we find that this difficulty can be overcome by taking into account correlation effects.
Namely, we show that the d-wave superconductivity of the doped Hubbard model can be dynamically transformed to topological d+id superconductivity by irradiation of circularly polarized light.
To this end, we derive the Floquet t-J model by combining Floquet theory and the Schrieffer-Wolff transformation.
The resulting Hamiltonian has emergent chiral many-body interactions with broken time-reversal symmetry, with which we can actually modulate the pairing symmetry. We demonstrate the topological phase transition within the framework of Gutzwiller approximation.
*JSPS KAKENHI Grant 20K14407 and JP17H06138; CREST (Core Research for Evolutional Science and Technology; Grant number JPMJCR19T3 and JPMJCR18T4)
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