Prasad Parmeshwar, Arora Nishta, Naik A K
Indian Institute of Science , Bangalore , India , 560012.
Nano Lett. 2019 Sep 11;19(9):5862-5867. doi: 10.1021/acs.nanolett.9b01219. Epub 2019 Aug 19.
Coupling between a mechanical resonator and optical cavities, microwave resonators, or other mechanical resonators have been used to observe interesting effects from sideband cooling to coherent manipulation of phonons. Here we demonstrate strong coupling between different vibrational modes of MoS drum resonators at room temperature. We observe intermodal as well as intramodal coupling. Cooperativity, a measure of coupling between the two modes, can be tuned by more than an order of magnitude by changing the direct current gate bias. The large measured cooperativity of about 900 at room temperature indicates that the phonon population can be coherently transferred between the modes for more than 500 cycles. This coherent oscillation is of great interest in studying quantum effects in macroscopic objects.
机械谐振器与光学腔、微波谐振器或其他机械谐振器之间的耦合已被用于观察从边带冷却到声子的相干操纵等有趣效应。在这里，我们展示了室温下MoS鼓式谐振器不同振动模式之间的强耦合。我们观察到了模式间以及模式内的耦合。通过改变直流栅极偏置，作为两种模式之间耦合度量的协同性可以调整超过一个数量级。在室温下测得的约900的大协同性表明，声子数可以在模式之间相干转移超过500个周期。这种相干振荡对于研究宏观物体中的量子效应非常有意义。
