Press Releases

2017.07.03

Single-Molecule Quantum Dot as a Kondo Simulator:Lecturer Emi Minamitani, Department of Material Engineering, Associate Professor Noriaki Takagi, Department of Advanced Materials Science, and other researchers.

ems 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 Fe2+ 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.

 

 

Nature Communications:https://www.nature.com/articles/ncomms16012