Korytár Richard, Evers Ferdinand
Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Praha 2, Czech Republic.
Institute of Theoretical Physics, University of Regensburg, D-93050 Regensburg, Germany.
Beilstein J Nanotechnol. 2023 Jun 12;14:711-721. doi: 10.3762/bjnano.14.57. eCollection 2023.
There has been great endeavor to engineer molecular rotors operated by an electrical current. A frequently met operation principle is the transfer of angular momentum taken from the incident flux. In this paper, we present an alternative driving agent that works also in situations where angular momentum of the incoming flux is conserved. This situation arises typically with molecular rotors that exhibit an easy axis of rotation. For quantitative analysis we investigate here a classical model where molecule and wires are represented by a rigid curved path. We demonstrate that in the presence of chirality, the rotor generically undergoes a directed motion, provided that the incident current exceeds a threshold value. Above this threshold, the corresponding rotation frequency (per incoming particle current) for helical geometries turns out to be 2π/, where / is the ratio of the mass of an incident charge carrier and the mass of the helix per winding number.
人们一直在努力设计由电流驱动的分子转子。一种常见的工作原理是从入射通量中获取角动量并进行转移。在本文中，我们提出了一种替代驱动因素，它在入射通量的角动量守恒的情况下也能起作用。这种情况通常出现在具有易旋转轴的分子转子中。为了进行定量分析，我们在此研究一个经典模型，其中分子和导线由刚性弯曲路径表示。我们证明，在手性存在的情况下，只要入射电流超过阈值，转子通常会发生定向运动。高于此阈值，螺旋几何结构的相应旋转频率（相对于每个入射粒子电流）为2π/，其中/是入射电荷载流子的质量与每匝数螺旋质量的比值。
