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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
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Optically excited structural transition in atomic wires on surfaces at the quantum limit.
1Fakultät für Physik und Center for Nanointegration (CENIDE), Universität Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany.
Nature
|March 30, 2017
Summary
Ultrafast laser excitation can rapidly alter atomic structures in low-dimensional materials. This study demonstrates a femtosecond structural transition in indium wires on silicon, revealing quantum control over material dynamics.
Area of Science:
- Materials Science
- Surface Science
- Quantum Dynamics
Background:
- Transient control of atomic potentials offers new states of matter.
- Ultrafast diffraction techniques probe femtosecond dynamics in solids.
- Low-dimensional materials show slower structural changes than bulk solids.
Purpose of the Study:
- Investigate the timescale of structural response in low-dimensional materials to ultrafast laser excitation.
- Determine if ultrafast structural transitions are possible in atomic wires.
Main Methods:
- Utilized ultrafast time-resolved diffraction.
- Studied photo-induced structural changes in atomic indium (In) wires on a silicon (Si) surface.
- Analyzed the transition from low- to high-symmetry states of a charge density wave.
Main Results:
- Observed a photo-induced structural transition in In wires within 350 femtoseconds.
- Demonstrated that optical excitation breaks/creates In-In bonds, exciting soft phonon modes.
- Showed coupling of phonon modes to surface/interface phonons drives the transition.
Conclusions:
- Confirms that low-dimensional materials can undergo ultrafast structural transitions.
- Highlights the potential for tuned electronic excitations to control interfacial dynamics in the quantum limit.
- Suggests applications in ultrafast detectors and dynamic response tuning.
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