Spin and density self-ordering in dynamic polarization gradients fields
| Autor: | Masalaeva, Natalia, Niedenzu, Wolfgang, Mivehvar, Farokh, Ritsch, Helmut |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. Research 3, 013173 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.3.013173 |
| Popis: | We study the zero-temperature quantum phase diagram for a two-component Bose-Einstein condensate in an optical cavity. The two atomic spin states are Raman coupled by two transverse orthogonally-polarized, blue detuned plane-wave lasers inducing a repulsive cavity potential. For weak pump the lasers favor a state with homogeneous density and predefined uniform spin direction. When one pump laser is polarized parallel to the cavity mode polarization, the photons coherently scattered into the resonator induce a polarization gradient along the cavity axis, which mediates long-range density-density, spin-density, and spin-spin interactions. We show that the coupled atom-cavity system implements central aspects of the $t$-$J$-$V$-$W$ model with a rich phase diagram. At the mean-field limit we identify at least four qualitatively distinct density- and spin-ordered phases including ferro- and anti-ferromagnetic order along the cavity axis, which can be controlled via the pump strength and detuning. A real time observation of amplitude and phase of the emitted fields bears strong signatures of the realized phase and allows for real-time determination of phase transition lines. Together with measurements of the population imbalance most properties of the phase diagram can be reconstructed. Comment: 9 pages, 4 figures |
| Databáze: | arXiv |
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