Spin-photon interaction in a cavity with time-reversal symmetry breaking
| Autor: | Daniel L. Creedon, Michael E. Tobar, Warrick G. Farr, Maxim Goryachev |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Photon
Population FOS: Physical sciences Physics::Optics 02 engineering and technology 01 natural sciences Paramagnetism symbols.namesake Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Symmetry breaking 010306 general physics Spin (physics) education Physics Quantum Physics Condensed Matter - Materials Science education.field_of_study Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Materials Science (cond-mat.mtrl-sci) Observable 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials T-symmetry symbols Atomic physics Quantum Physics (quant-ph) 0210 nano-technology Hamiltonian (quantum mechanics) |
| Zdroj: | Physical Review B. 89 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.89.224407 |
| Popis: | Employing a sapphire whispering gallery mode resonator, we demonstrate features of the spin-photon interaction in cavities with broken time-reflection symmetry. The broken symmetry leads to a lifting of the degeneracy between left-handed and right-handed polarised cavity photons, which results in an observable gyrotropic effect. In the high-$Q$ cavity limit, such a situation requires a modification of the Tavis-Cummings Hamiltonian to take into account conservation of spin angular momentum and the corresponding selection rules. As a result, the system is represented by a system of two linearly coupled bosonic modes, with each one coupled to its own sub-ensemble of two-level systems with different energy splittings. In the experimental example, these sub-ensembles originate from Fe$^{3+}$ impurity ions effectively seen as a two level systems at the interaction frequency. The temperature dependence of the population of each sub-ensemble (in terms of effective susceptibility of the medium) is determined experimentally in accordance with the theoretical predictions revealing various paramagnetic impurity types in the solid. The regimes of backscatterer and spin ensemble domination are discussed and compared. Comment: Phys. Rev. B, 2014 |
| Databáze: | OpenAIRE |
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