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arXiv 1907.04039quant-phcond-mat.mes-hall
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微磁体量子声力学

Quantum Acoustomechanics with a Micromagnet

Carlos Gonzalez-Ballestero, Jan Gieseler, Oriol Romero-Isart

摘要:

我们从理论上展示了如何将微磁体的质心运动与其声学声子模式之一强烈耦合。耦合是由振荡磁场梯度和静态均匀磁场的组合引起的。前者将质心运动参数化地耦合到磁振子模式,而后者将磁振子模式调谐为与给定的声学声子模式共振。可以调节磁场以将质心运动冷却到基态,或者进入强量子耦合状态。因此,质心可以用来探测和操纵声学模式,从而为非平衡量子纳米物理学开辟了新的可能性。我们的研究结果保持实验可行的参数,并适用于悬浮的微磁体,以及微磁体上沉积的夹持纳米机械振荡器。

英文摘要:

We theoretically show how to strongly couple the center-of-mass motion of a micromagnet in a harmonic potential to one of its acoustic phononic modes. The coupling is induced by a combination of an oscillating magnetic field gradient and a static homogeneous magnetic field. The former parametrically couples the center-of-mass motion to a magnonic mode while the latter tunes the magnonic mode in resonance with a given acoustic phononic mode. The magnetic fields can be adjusted to either cool the center-of-mass motion to the ground state, or to enter into the strong quantum coupling regime. The center-of-mass can thus be used to probe and manipulate an acoustic mode, thereby opening new possibilities for out-of-equilibrium quantum nanophysics. Our results hold for experimentally feasible parameters and apply to levitated micromagnets as well as micromagnets deposited on a clamped nanomechanical oscillator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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