Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session VV01: V: Poster Session III (7:00am-8:00am, PST)
7:00 AM,
Wednesday, March 22, 2023
Room: Virtual Room 1
Abstract: VV01.00038 : Title: Light-induced band-topology & metal-insulator transitions in interacting Kagome lattice*
Presenter:
SUBHAJYOTI PAL
(National Institute of Science Education)
Author:
SUBHAJYOTI PAL
(National Institute of Science Education)
Collaboration:
We acknowledge the use of the NOETHER, VIRGO, and KALINGA clusters at NISER for numerical computations.
We study the interplay between electron interaction and external periodic circularly-polarised light drive on Kagome lattice in the off-resonant limit. Employing the Brillouin-Wigner perturbation theory we derive an effective Hamiltonian and show that in the non-interacting limit the periodic drive not only modulates the bare hopping amplitudes but generates new hopping terms that bestow non-trivial topology to the bands. We then employ slave-rotor mean field theory to investigate correlation effects in the system at half-filling and demonstrate repeated metal to topological-Mott-insulator phase transitions with the light amplitude at intermediate interaction strengths. At strong interaction strengths, we find periodic topological phase transitions between insulating states with distinct band topologies. We show that due to the interplay of emergent chiral hopping spinon flat bands are generated in the Mott insulating phase. We briefly discuss ways to realize the model in cold-atomic systems. Finally from the interacting model study, we propose an electronic-chiral Hamiltonian which has a rich topological band structure where electronic-flat bands can be engineered.
*We acknowledge the Department of Atomic Energy for funding us.
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