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- W2894838636 abstract "We theoretically investigate the rigid body dynamics of an optically levitated nanodumbbell under parametric feedback cooling and provide a simplified model for describing the motion. Differing from previous studies, the spin of the nanoparticle about its symmetry axis is considered nonnegligible. Simulations reveal that standard parametric feedback cooling can extract energy from two of the five rotational degrees of freedom when the nanoparticle is levitated using a linearly polarized laser beam. The dynamics after feedback cooling are characterized by a normal mode describing precession about the laser polarization axis together with spin about the nanoparticle's symmetry axis. Cooling the remaining mode requires an asymmetry in the two librational frequencies associated with motion about the polarization axis as well as information about the two frequencies of rotation about the polarization axis. Introducing an asymmetric potential allows full cooling of the librational coordinates if the frequencies of both are used in the feedback modulation and is an avenue for entering the librational quantum regime. The asymmetry in the potential needs to be large enough for practical cooling times as the cooling rate of the system depends nonlinearly on the degree of asymmetry, a condition that is easily achieved experimentally." @default.
- W2894838636 created "2018-10-12" @default.
- W2894838636 creator A5002353115 @default.
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- W2894838636 date "2019-01-14" @default.
- W2894838636 modified "2023-09-23" @default.
- W2894838636 title "Parametric feedback cooling of rigid body nanodumbbells in levitated optomechanics" @default.
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- W2894838636 doi "https://doi.org/10.1103/physreva.99.013821" @default.
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