Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.41: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Magnetism in ultrathin quantum spin liquid Na2IrO3 flakes — •Deepak Roy and Mukul Kabir — Department of Physics, IISER Pune - 411008, India
Quantum spin liquids have attracted significant attention due to their complex physics arising from the interplay among the lattice geometry, spin-orbit coupling, and electron correlation. The Ir4+ oxides and Ru3+ chlorides possessing a honeycomb jeff = 1/2 lattice are the primary candidate materials, which eventually exhibit long-range ordering at low temperatures. Using first-principles calculations, we explore ultrathin Na2IrO3 flakes to find that the zigzag antiferromagnetic ground state persists up to the monolayer. Magnetic ordering is investigated using appropriate Kitaev-Heisenberg Monte Carlo simulations. Surprisingly, the magnetic state is reinforced, and the monolayer is driven away from the Kitaev spin liquid state due to stronger Heisenberg and off-diagonal exchange interactions. In contrast, the charge-doped flakes undergo a Mott insulator-to-metal transition, and the flakes become ferromagnetic. These results illustrate exciting prospects for understanding magnetism in ultrathin non-van der Waals correlated oxides and their prospect in spin devices.
Keywords: Non-van der Waals flakes; Kitaev spin liquid; 2D magnetism; Na2IrO3; Kitaev-Heisenberg model