Center for NanoScience (CeNS) and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, München 80539, Germany.
Phys Rev Lett. 2012 Jul 20;109(3):037205. doi: 10.1103/PhysRevLett.109.037205. Epub 2012 Jul 17.
The Landau-Zener transition is a fundamental concept for dynamical quantum systems and has been studied in numerous fields of physics. Here, we present a classical mechanical model system exhibiting analogous behavior using two inversely tunable, strongly coupled modes of the same nanomechanical beam resonator. In the adiabatic limit, the anticrossing between the two modes is observed and the coupling strength extracted. Sweeping an initialized mode across the coupling region allows mapping of the progression from diabatic to adiabatic transitions as a function of the sweep rate.
朗道-泽纳跃迁是动力学量子系统的一个基本概念，在物理学的众多领域都有研究。在这里，我们提出了一个使用相同纳米机械梁谐振器的两个可反向调谐的强耦合模式的经典力学模型系统，该系统表现出类似的行为。在绝热极限下，观察到两个模式之间的反交叉，并提取出耦合强度。初始化模式在耦合区域内的扫动允许将从非绝热到绝热跃迁的进展作为扫速的函数进行映射。
