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Topology-insensitive axion mass in magnetic topological insulators

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arxiv 2206.00841 v2 pith:JPHQJVQB submitted 2022-06-02 hep-ph cond-mat.mes-hallcond-mat.str-el

Topology-insensitive axion mass in magnetic topological insulators

classification hep-ph cond-mat.mes-hallcond-mat.str-el
keywords axionmagneticmasstopologicalstateinsulatorsstatesantiferromagnetic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the axion in three-dimensional topological insulators with magnetic impurities under finite temperature. We find a stable antiferromagnetic ground state and ferromagnetic metastable state. In both magnetic states, the mass of the axion is found to be up to eV scale and it approaches zero near the phase boundary of the magnetic state. This result applies to both normal and topological insulator phases, i.e., the axion mass is insensitive to the topological states, and it will have a direct impact on the targeted mass range of particle axion dark matter in future experiments.

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  1. Collective excitations in magnetic topological insulators and axion dark matter search

    hep-ph 2024-06 unverdicted novelty 4.0

    Effective EM coupling of the axionic quasi-particle mode in magnetic TIs is unchanged or suppressed by up to 100x relative to previous estimates.