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F. M. Bukhanko
2D Majorana Flat Bands as Reason of Topological Superconductivity in Two-Dimensional Z2-Quantum Spin Liquid in La0.15Sm0.85MnO3+δ Manganites
0033–0047 (2023)

PACS numbers: 14.80.Va, 74.10.+v, 74.20.Mn, 74.81.Bd, 75.30.Et, 75.30.Kz, 75.47.Lx

As shown, the formation and destruction of 2D Majorana flat zones in frustrated La0.15Sm0.85MnO3+δ manganites occur as a result of Landau quantization of the spectrum of magnetic excitations of the Z2-quantum spin liquid with magnetic flux in the form of composite quasi-particles ‘spinon–gauge field’. In this work, the dynamics of the formation and destruction of 2D Majorana flat zones in frustrated manganites is also studied by analysing of the dc field M(H) dependences measured in the zero-field-cooled (ZFC) and field-cooled (FC) measurement modes. As shown, in the processes of magnetization reversal of La0.15Sm0.85MnO3+δ at 4.2 K, a superposition of the hump-like asymmetric features of the M(H) plots is formed in the range of magnetic fields of ±500 Oe, and non-dispersive ultra-narrow 2D Majorana flat zones of excited states of Z2-chiral quantum spin liquid are formed in the range of weak magnetic fields of 100–200 Oe near the zero field, similarly to flat bands in the low-dimensional topological superconductors.

Key words: 2D Majorana flat zones, Landau quantization, Z2-chiral quantum spin liquid, gauge field of spinon-pairs’ spectrum, topological superconductors.

https://doi.org/10.15407/nnn.21.01.033

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