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- W3213507941 abstract "In 3+1 dimensional spacetime, two vector gauge anomalies are known: The chiral anomaly and the mixed axial-gravitational anomaly. While the former is well documented and tied to the presence of a magnetic field, the latter instead requires a nonzero spacetime curvature, which has made it rather difficult to study. In this work, we show that a quantum anomaly arises in the second-order electrical response for zero magnetic field, which creates a dc-current that can be either longitudinal or transverse to electric field. Consequently, the continuity equation for the chiral current is not conserved at order $tau^{-1}$, where $tau$ is the quasiparticle relaxation time. We can identify the anomaly as a mixed axial-gravitational one, and predict a material in which the anomaly-induced current can be isolated in a purely electrical measurement. Our findings indicate that charge transport generically derives from quasiparticle motion in an emergent curved spacetime, with potentially far-reaching consequences for all types of response functions." @default.
- W3213507941 created "2021-11-22" @default.
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- W3213507941 date "2021-11-15" @default.
- W3213507941 modified "2023-10-18" @default.
- W3213507941 title "Mixed axial-gravitational anomaly from emergent curved spacetime in nonlinear charge transport" @default.
- W3213507941 doi "https://doi.org/10.48550/arxiv.2111.07780" @default.
- W3213507941 hasPublicationYear "2021" @default.
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