Quantum anomalous Hall domains in a Quenched Topological Mott Insulator

• URL: http://arxiv.org/abs/2502.05035v1
• Date: Fri, 07 Feb 2025 16:02:46 GMT
• Title: Quantum anomalous Hall domains in a Quenched Topological Mott Insulator
• Authors: Lara Ulčakar, Gal Lemut, Tomaž Rejec, Jernej Mravlje,
• Abstract summary: We study an interacting spinless quadratic band touching model that realizes a topological Mott insulating state. We perform time-dependent Hartree-Fock simulations and show that after the quench the system realizes an excited Dirac semimetal state.
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• Abstract: We study an interacting spinless quadratic band touching model that realizes a topological Mott insulating state. We quench the interaction from a value corresponding to the nematic insulator to that of the quantum anomalous Hall (QAH) ordered phase. We perform time-dependent Hartree-Fock simulations and show that after the quench the system realizes an excited Dirac semimetal state, which is however unstable and spontaneously evolves to a state with inhomogeneous nematic and QAH order parameters. The modulations form a stripe pattern that grows exponentially with time until the local Chern marker reaches unity. The alternating QAH order defines a domain structure with boundaries that host chiral sublattice currents.

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