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Title: Scanning Tunneling Microscopy Observation of Phonon Condensate

Journal Article · · Scientific Reports
DOI: https://doi.org/10.1038/srep43214 · OSTI ID:1357137
 [1]; ORCiD logo [2];  [1];  [1];  [3];  [3]
  1. Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)

Using quantum tunneling of electrons into vibrating surface atoms, phonon oscillations can be observed on the atomic scale. Phonon interference patterns with unusually large signal amplitudes have been revealed by scanning tunneling microscopy in intercalated van der Waals heterostructures. Our results show that the effective radius of these phonon quasi-bound states, the real-space distribution of phonon standing wave amplitudes, the scattering phase shifts, and the nonlinear intermode coupling strongly depend on the presence of defect-induced scattering resonance. The observed coherence of these quasi-bound states most likely arises from phase- and frequency-synchronized dynamics of all phonon modes, and indicates the formation of many-body condensate of optical phonons around resonant defects. We found that increasing the strength of the scattering resonance causes the increase of the condensate droplet radius without affecting the condensate fraction inside it. The condensate can be observed at room temperature.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1357137
Report Number(s):
LA-UR-17-22298
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 7; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Lifetime of flatband states journal October 2018
Quantum Fluctuations in the Fröhlich Condensate of Molecular Vibrations Driven Far From Equilibrium journal April 2019
Out-of-Equilibrium Collective Oscillation as Phonon Condensation in a Model Protein journal September 2018

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