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arXiv 1609.05620cond-mat.mes-hall
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基于WSe2单层膜的高品质因数机械谐振器

High quality-factor mechanical resonators based on WSe2 monolayers

Nicolas Morell, Antoine Reserbat-Plantey, Ioannis Tsioutsios, Kevin G. Schädler, François Dubin, Frank H. L. Koppens, Adrian Bachtold

摘要:

悬浮单层过渡金属-二硫属化物(TMD)是一种结合了超低质量和优异光学性能的膜,使其成为光机械应用的有趣材料。然而,到目前为止,TMD谐振器的低测量品质因数一直是一个障碍。在这里,我们报告了一个超灵敏的单层TMD谐振器,使我们能够揭示其在低温下的机械性能的光学读出。我们发现,单层WSe 2谐振器的品质因数在室温以下大大增加,在液氮温度下达到1.6E^4,在液氦温度下达到4.7E^4。这超过了具有类似表面积的单层石墨烯谐振器的品质因数。在冷却谐振器时,由于WSe 2晶格的热收缩,谐振频率显著增加。这些测量使我们能够实验研究的热膨胀系数的WSe 2单分子膜的第一次。在基于MoS 2和MoSe 2单层的谐振器中也发现了高Q因子。在这项工作中发现的高品质因数的耦合机械振动态的二维激子,谷赝自旋,和单量子发射器,并为量子光机械实验的基础上的Casimir相互作用开辟了新的可能性。

英文摘要:

Suspended monolayer transition metal-dichalcogenides (TMD) are membranes that combine ultra-low mass and exceptional optical properties, making them intriguing materials for opto-mechanical applications. However, the low measured quality factor of TMD resonators has been a roadblock so far. Here, we report an ultrasensitive optical readout of monolayer TMD resonators that allows us to reveal their mechanical properties at cryogenic temperatures. We find that the quality factor of monolayer WSe2 resonators greatly increases below room temperature, reaching values as high as 1.6E^4 at liquid nitrogen temperature and 4.7E^4 at liquid helium temperature. This surpasses the quality factor of monolayer graphene resonators with similar surface areas. Upon cooling the resonator, the resonant frequency increases significantly due to the thermal contraction of the WSe2 lattice. These measurements allow us to experimentally study the thermal expansion coefficient of WSe2 monolayers for the first time. High Q-factors are also found in resonators based on MoS2 and MoSe2 monolayers. The high quality-factor found in this work opens new possibilities for coupling mechanical vibrational states to two-dimensional excitons, valley pseudospins, and single quantum emitters, and for quantum opto-mechanical experiments based on the Casimir interaction.

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