Nonlocal activation of a bistable atom through a surface state charge-transfer process on Si(100)-(2×1):H

Area of Science:

• Surface science
• Scanning probe microscopy
• Materials science

Background:

• Bistable atoms on surfaces exhibit unique quantum phenomena.
• Surface states play a crucial role in atomic manipulation.
• Scanning tunneling microscopy (STM) enables atomic-scale investigations.

Purpose of the Study:

• To investigate the nonlocal activation of bistable atom hopping.
• To understand the influence of hole injection on atomic mobility.
• To explore charge-transfer dynamics on semiconductor surfaces.

Main Methods:

• Low-temperature (5 K) scanning tunneling microscopy (STM).
• Nonlocal hole injection into Si-Si bond surface states.
• Analysis of hopping yield variations with respect to injection site.

Main Results:

• Reversible hopping of a bistable atom on Si(100)-(2×1):H surface was achieved.
• Hopping yield showed significant variations with proximity (<1.5 nm) to the hole injection site.
• Observed variations correlate with the density of states and charge-transfer pathways.

Conclusions:

• Hole injection provides a nonlocal mechanism for controlling atomic hopping.
• The silicon bond network facilitates charge transfer, influencing atomic movement.
• STM is a powerful tool for probing charge dynamics and atomic manipulation on surfaces.