| 报告题目： |
Local Investigation of Single Magnetic Molecules with Scanning Tunneling Microscopy |
| 报告人： |
Jinjie Chen |
| 报告人单位： |
Physikalisches Institut, Karlsruhe Institute of Technology |
| 报告时间： |
5月23号星期三中午1点 |
| 报告地点： |
科技楼南501会议室 |
| 报告摘要： |
|
|
Single magnetic atoms and molecules have the potential to be used as building blocks for quantum bits in quantum computers. In contrast to atoms in free space, the ions in magnetic molecules are influenced by the electrostatic interaction with the organic ligands. This opens up means to manipulate the characteristics of the magnetic molecules by modifying the ligands. Together with the spin-orbit interaction, the crystal field contributed by the ligands leads to magnetic anisotropy, or more precisely to the zero field splitting (ZFS) of the magnetic multiplet of the 2S+1 states. This anisotropy is crucial to achieving a stable magnetization.
The focus of this talk will show systematic experiments on the manipulation of the ZFS of mechanically flexible metal-chelate molecules (Co, Ni, and Cu as metal ions) adsorbed on single layers of Cu2N on Cu(100) by inelastic tunneling spectroscopy at temperatures down to 30 mK. When approaching the tip toward the molecule, the tunneling current abruptly jumps to higher values indicating the sudden deformation of the molecule bridging the tunneling junction. Hand in hand with the formation of the contact, we observed an abrupt change of the ZFS, which alters the energetic order of the spin states. This sharp transition in the ZFS potentially allows preparing superposition quantum states, a necessary requirement for quantum computing. |
