Observation of low-temperature magnetomechanic effects in crystalline resonant phonon cavities

Article

关键词: QUARTZ;   

DOI  :  10.1103/PhysRevB.100.174108

来源: SCIE

【 摘 要 】

We observe magnetic effects in ultrahigh-quality factor crystalline quartz bulk acoustic wave resonators at milli-Kelvin temperature. The study reveals the existence of hysteresis loops, jumps, and memory effects of acoustical resonance frequencies. These loops arise as a response to the external magnetic field, and they span a few Hertz for modes with linewidths of about 25 mHz, which constitute a frequency shift of order 60 linewidths. The effects are broadband but get stronger toward higher frequencies where both nonlinear effects and losses are limited by two-level systems. This suggests that the observed effects are due to the ferromagnet-like phase of a spin ensemble coupled to mechanical modes. The observed coupling between mechanical and spin degrees of freedom in the ultralow-loss regime brings about new possibilities for the emerging class of quantum hybrid systems.

【 授权许可】

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