A quantum sensor for atomic-scale electric and magnetic fields
Researchers developed a quantum sensor using iron atoms and PTCDA molecules on a scanning tunneling microscope tip, achieving high sensitivity for detecting atomic-scale electric and magnetic fields with sub-angstrom resolution.
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Researchers have developed a novel quantum sensor capable of detecting atomic-scale electric and magnetic fields, addressing a significant challenge in physics. This sensor is constructed by attaching iron (Fe) atoms and a PTCDA (3,4,9,10-perylenetetracarboxylic-dianhydride) molecule to the apex of a scanning tunneling microscope (STM) tip. The sensor achieves approximately 100 neV energy resolution and demonstrates the ability to measure magnetic and electric dipole fields from a single Fe atom and an Ag dimer on an Ag(111) surface with sub-angstrom spatial resolution. The design allows for mobile quantum sensing without the need for insulating substrates, which has been a limitation in previous experiments.
The sensor operates by utilizing electron spin resonance (ESR) to address the molecular spin, enabling the detection of spin states and their transitions. The integration of the standing PTCDA molecule enhances the sensor's sensitivity while minimizing the coupling of the molecular spin to the metal tip. The research indicates potential applications in sensing spin-labeled biomolecules and exploring spin textures in quantum materials. The findings represent a significant advancement in nanoscale sensing technology, paving the way for future experiments in quantum mechanics and materials science.
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