Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Nat Commun. 2017 Jun 30;8:16012. doi: 10.1038/ncomms16012.
Structural flexibility of molecule-based systems is key to realizing the novel functionalities. Tuning the structure in the atomic scale enables us to manipulate the quantum state in the molecule-based system. Here we present the reversible Hamiltonian manipulation in a single-molecule quantum dot consisting of an iron phthalocyanine molecule attached to an Au electrode and a scanning tunnelling microscope tip. We precisely controlled the position of Fe ion in the molecular cage by using the tip, and tuned the Kondo coupling between the molecular spins and the Au electrode. Then, we realized the crossover between the strong-coupling Kondo regime and the weak-coupling regime governed by spin-orbit interaction in the molecule. The results open an avenue to simulate low-energy quantum many-body physics and quantum phase transition through the molecular flexibility.
基于分子的系统的结构灵活性是实现新颖功能的关键。在原子尺度上调整结构使我们能够操纵基于分子的系统中的量子态。在这里，我们展示了由附着在 Au 电极和扫描隧道显微镜尖端上的铁酞菁分子组成的单个分子量子点中的可逆哈密顿量操纵。我们通过尖端精确控制分子笼中的 Fe 离子的位置，并调整分子自旋与 Au 电极之间的 Kondo 耦合。然后，我们在分子中实现了由自旋轨道相互作用控制的强耦合 Kondo 区和弱耦合区之间的交叉。这些结果为通过分子的灵活性来模拟低能量子多体物理和量子相变开辟了一条途径。
