相变材料的可调Casimir平衡：从量子俘获到释放
Tunable Casimir equilibria with phase change materials: from quantum trapping to its release
摘要：
由于卡西米尔力，纳米颗粒的稳定悬浮对于许多应用例如传感、非接触纳米机器具有极大的兴趣。然而，一旦装置被制造，悬浮特性就难以改变。二氧化钒（VO $_2$）是一种相变材料，其在340 K左右经历从低温绝缘相到高温金属相的转变。在这项工作中，我们研究Casimir力之间的纳米板（金或聚四氟乙烯）和含有VO $_2$膜的层状结构。结果表明，在液相环境中可以实现纳米片的Casimir稳定悬浮，其平衡距离不仅取决于层厚，还取决于VO $_2$的物相.在适当的设计下，由于VO $_2$的金属-绝缘体转变，揭示了从金纳米片的量子捕获（“开”状态）到其释放（“关”状态）的开关。另一方面，在VO $_2 $的绝缘体-金属转变下发现了Teflon纳米片的量子俘获和释放。我们的研究结果提供了在微和纳米机电系统的应用设计可切换设备的可能性。
英文摘要：
A stable suspension of nanoscale particles due to the Casimir force is of great interest for many applications such as sensing, non-contract nano-machines. However, the suspension properties are difficult to change once the devices are fabricated. Vanadium dioxide (VO$_2$) is a phase change material, which undergoes a transition from a low-temperature insulating phase to a high-temperature metallic phase around a temperature of 340 K. In this work, we study Casimir forces between a nanoplate (gold or Teflon) and a layered structure containing a VO$_2$ film. It is found that stable Casimir suspensions of nanoplates can be realized in a liquid environment, and the equilibrium distances are determined, not only by the layer thicknesses but also by the matter phases of VO$_2$. Under proper designs, a switch from quantum trapping of the gold nanoplate ("on" state) to its release ("off" state) as a result of the metal-to-insulator transition of VO$_2$, is revealed. On the other hand, the quantum trapping and release of a Teflon nanoplate is found under the insulator-to-metal transition of VO$_2 $. Our findings offer the possibility of designing switchable devices for applications in micro-and nano-electromechanical systems.
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