Parity-invariant 3d CFTs gapped by a magnetic field satisfy c0 <= 0 and additional Wilson-coefficient bounds from dispersion relations, implying diamagnetism and positive background-monopole scaling dimensions.
Derivative Expansion of the Effective Action and Vacuum Instability for QED in 2+1 Dimensions
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abstract
We investigate the effective action of 2+1 dimensional charged spin 1/2 fermions and spin 0 bosons in the presence of a $U(1)$ gauge field. We evaluate terms in an expansion up to second order in derivatives of the field strength, but exactly in the mass parameter and in the magnitude of the nonvanishing constant field strength. We find that in a strong uniform magnetic field background, space-derivative terms lower the energy, and there arises an instability toward inhomogeneous magnetic fields.
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Magnetised Bounds for Conformal Field Theories
Parity-invariant 3d CFTs gapped by a magnetic field satisfy c0 <= 0 and additional Wilson-coefficient bounds from dispersion relations, implying diamagnetism and positive background-monopole scaling dimensions.