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Updated: Apr 4, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Tuning phonon transmission via single-atom substituents.
Yuxuan Luan1, Matthias Blaschke2, Yuji Isshiki1
1Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA.
Researchers precisely controlled heat transport in molecular junctions by altering individual atoms. This atomic-level manipulation of phonon transport offers new avenues for designing advanced electronic and energy devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Thermal transport is critical for electronic, photonic, and energy devices.
- Nanostructuring influences heat transport, but atomic-scale control remains underexplored.
Purpose of the Study:
- To investigate atomic-scale control of phonon transport in molecular junctions.
- To explore the impact of atomic substitution on thermal conductance.
Main Methods:
- Developed high-resolution cryogenic-compatible calorimetric scanning probes.
- Conducted systematic experimental studies at 77 K.
- Performed detailed first-principles modeling.
Main Results:
- Demonstrated that substituting hydrogen with halogens (F, Cl, Br, I) tunes thermal conductance by a factor of two.
- Elucidated how atomic substituents modify vibrational eigenmode interactions.
- Observed suppression of resonances and creation of antiresonances in phonon transmission.
Conclusions:
- Atomic-level modifications enable precise control over thermal transport in molecular junctions.
- Insights inform strategies for probing and controlling thermal transport in molecular materials.
- Advances pave the way for novel nanoscale thermal management solutions.
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