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Related Experiment Video

Updated: Dec 10, 2025

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

Sub-cycle atomic-scale forces coherently control a single-molecule switch.

Dominik Peller¹, Lukas Z Kastner¹, Thomas Buchner¹

¹Department of Physics, University of Regensburg, Regensburg, Germany.

|September 4, 2020

Summary

This summary is machine-generated.

Researchers used terahertz waves to apply ultrafast forces, controlling atomic motion in molecules. This breakthrough enables precise manipulation for chemical reactions and phase transitions at the atomic scale.

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Area of Science:

Physics
Chemistry
Materials Science

Background:

Scanning probe techniques utilize precise forces for atomic manipulation.
Exploiting ultrafast dynamics for coherent atomic-scale control is a significant challenge.

Purpose of the Study:

To demonstrate femtosecond atomic-scale force application for selective molecular motion.
To achieve coherent control over molecular dynamics using lightwave-driven forces.

Main Methods:

Utilized lightwave-driven scanning tunneling microscopy.
Employed ultrafast action spectroscopy with terahertz waves confined to an atomically sharp tip.

Main Results:

Achieved selective, coherent hindered rotation in magnesium phthalocyanine molecules.
Modulated molecular switching probability by up to 39% using femtosecond forces.
Demonstrated atomic-scale force application within less than an optical cycle.

Conclusions:

Developed a method for coherent manipulation of atomic motion using ultrafast forces.
Opens possibilities for controlling chemical reactions and phase transitions at intrinsic scales.