Li@C₆₀ as a multi-state molecular switch

Area of Science:

• Molecular electronics
• Nanotechnology
• Quantum chemistry

Background:

• Molecular switches are key components for miniaturizing electronic devices.
• Existing molecular switches have limited multi-state capabilities (up to six states).
• Molecular decomposition is a challenge in developing stable molecular switches.

Purpose of the Study:

• To report a novel multi-state single molecule switch.
• To investigate the switching mechanism of endohedral fullerenes.
• To achieve a higher number of accessible molecular states.

Main Methods:

• Low temperature scanning tunneling microscopy (STM).
• Scanning tunneling spectroscopy (STS).
• Investigating endohedral fullerene Li@C60.

Main Results:

• Demonstrated a single molecule switch with 14 distinct states.
• Statistically accessed multiple molecular states.
• Proposed a switching mechanism involving resonant tunneling via superatom molecular orbitals (SAMOs).

Conclusions:

• Li@C60 functions as a highly multi-state molecular switch.
• Resonant tunneling via SAMOs enables Li activation, bypassing cage decomposition.
• This work advances the development of complex molecular electronic components.