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On Thermal Nieh-Yan Anomaly in Topological Weyl Materials
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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4
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JETP Letters, Volume 110, issue 12, pp. 789–792
Abstract
We discuss the possibility of gravitational Nieh-Yan anomaly of the type ∂μj~5μ=γT2Ta∧Ta in topological Weyl materials, where T is temperature and Ta is the effective or emergent torsion. As distinct from the non-universal parameter ⋀ in the conventional (zero temperature) Nieh-Yan anomaly — with canonical dimensions of momentum — the parameter γ is dimensionless. This suggests that the dimensionless parameter is fundamental, being determined by the geometry, topology and number of the number of chiral quantum fields without any explicit non-universal UV scales. This conforms with previous results in the literature, as well as spectral flow calculations using torsional magnetic field at finite temperature.
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| openaire: EC/H2020/694248/EU//TOPVAC
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Nissinen, J & Volovik, G E 2020, 'On Thermal Nieh-Yan Anomaly in Topological Weyl Materials', JETP Letters, vol. 110, no. 12, pp. 789–792. https://doi.org/10.1134/S0021364019240020