Relativistic analysis of magnetoelectric crystals: extracting a new 4-dimensional P odd and T odd pseudoscalar from Cr_2 O_3 data
| Autor: | Hans Schmid, Friedrich W. Hehl, Jean-Pierre Rivera, Yuri N. Obukhov |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
High Energy Physics - Theory
Electrodynamics Magnetoelectric effect General Physics and Astronomy FOS: Physical sciences Physics - Classical Physics General Relativity and Quantum Cosmology (gr-qc) General Relativity and Quantum Cosmology Moduli Gyrator Relativity Magnetization Condensed Matter::Materials Science Theory of relativity Chromium oxide Cr2O3 Quantum mechanics Axion Physics PEMC Classical Physics (physics.class-ph) Magnetoelectric media Axion electrodynamics Polarization (waves) Constitutive law Pseudoscalar Broken P and T invariance High Energy Physics - Theory (hep-th) ddc:540 |
| Zdroj: | Physics Letters. A, Vol. 372, No 8 (2008) pp. 1141-1146 |
| ISSN: | 0375-9601 |
| DOI: | 10.48550/arxiv.0708.2069 |
| Popis: | Earlier, the linear magnetoelectric effect of chromium sesquioxide Cr_2 O_3 has been determined experimentally as a function of temperature. One measures the electric field-induced magnetization on Cr_2 O_3 crystals or the magnetic field-induced polarization. From the magnetoelectric moduli of Cr_2 O_3 we extract a 4-dimensional relativistic invariant pseudoscalar \tilde\alpha. It is temperature dependent and of the order of ~ 10^{-4} Y_0, with Y_0 as vacuum admittance. We show that the new pseudoscalar \tilde\alpha is odd under parity transformation and odd under time inversion. Moreover, \tilde\alpha is for Cr_2 O_3 what Tellegen's gyrator is for two port theory, the axion field for axion electrodynamics, and the PEMC (perfect electromagnetic conductor) for electrical engineering. Comment: 6 pages latex, 3 figures, accepted by Physics Letters A |
| Databáze: | OpenAIRE |
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