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Atomic-scale quantum sensing based on the ultrafast coherence of an H 2 molecule in an STM cavity

Journal Article · · Science
 [1];  [1];  [2]
  1. Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.
  2. Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.; Department of Chemistry, University of California, Irvine, CA 92697, USA.
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A scanning tunneling microscope (STM) combined with a pump-probe femtosecond terahertz (THz) laser can enable coherence measurements of single molecules. We report THz pump-probe measurements that demonstrate quantum sensing based on a hydrogen (H2) molecule in the cavity created with an STM tip near a surface. Atomic-scale spatial and femtosecond temporal resolutions were obtained from this quantum coherence. The H2acts as a two-level system, with its coherent superposition exhibiting extreme sensitivity to the applied electric field and the underlying atomic composition of the copper nitride (Cu2N) monolayer islands grown on a Cu(100) surface. We acquired time-resolved images of THz rectification of H2over Cu2N islands for variable pump-probe delay times to visualize the heterogeneity of the chemical environment at sub-angstrom scale.

Research Organization:
Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0019448
OSTI ID:
1980746
Journal Information:
Science, Vol. 376, Issue 6591; ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

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