论文标题
与相变材料的可调Casimir平衡：从量子捕获到其释放
Tunable Casimir equilibria with phase change materials: from quantum trapping to its release
论文作者
论文摘要
对于许多应用，例如传感，非合同纳米机器，纳米级颗粒的稳定悬浮液引起了极大的兴趣。但是，一旦设备制造，悬架特性就很难更改。二氧化钒（VO $ _2 $）是一种相变材料，它从低温绝缘阶段过渡到340 K温度围绕340 K的高温金属阶段的过渡。在这项工作中，我们研究了纳米板（黄金或teflon）之间的casimir力量，并包含vo $ _2 $ _2 $ _2 $ _2 $ _2 $ _2。发现可以在液体环境中实现稳定的Casimir悬浮液，并且平衡距离不仅取决于层厚度，而且还取决于VO $ _2 $的物质阶段。在适当的设计下，揭示了从金纳米板（“ on”状态）转换为释放（“ off”状态）的转换，这是由于金属到vo $ _2 $的金属向绝缘体过渡的结果。另一方面，在vo $ _2 $的绝缘体到金属过渡下发现了特氟龙纳米板的量子捕获和释放。我们的发现提供了设计可切换设备，以用于微型和纳米机电系统中的应用。
A stable suspension of nanoscale particles due to the Casimir force is of great interest for many applications such as sensing, non-contract nano-machines. However, the suspension properties are difficult to change once the devices are fabricated. Vanadium dioxide (VO$_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.
