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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
Coupling of Kondo resonance with RF signal injected in a scanning tunneling microscope junction
Shishir Kumar Dey1, Zhipeng Wang1, Md Arafat Ali1
1Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan.
Abstract:
We injected an RF signal into the scanning tunneling microscope (STM) junction. A radical molecule of 1,3,5-triphenyl-6-oxoverdazyl (TOV) adsorbed on the Au(111) surface was used as a sample, in which the Kondo resonance, which arises when the substrate's itinerant electrons screen the isolated spin of the molecule, was observed. With increased injected RF power, the Kondo peak undergoes energy splitting and intensity suppression, with the latter accompanied by an intriguing beat-like oscillation. The peak suppression is accounted for by the Kondo resonance's decoherence due to the flip of the unpaired spin. Unlike previous works reported for the suppression by RF power (energy ℏω), we demonstrated that this phenomenon occurs when ℏω is smaller than the Kondo resonance energy; this suggests that multiple photons can induce the spin-flip process, which appears as a beat in the Kondo intensity decay as a function of RF power. This finding should benefit Kondo resonance control in systems with stronger spin-substrate coupling.
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