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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

References (68)

Scanning Tunneling Microscopy of Atomic Scale Phonon Standing Waves in Quasi-freestanding WSe 2 Monolayers journal January 2016
Theory of resonant scattering in two dimensions journal December 2009
Adsorption of gas molecules on monolayer MoS2 and effect of applied electric field journal January 2013
Spatially non-uniform ground state and quantized vortices in a two-component Bose-Einstein condensate of magnons journal June 2012
Propagating phonons coupled to an artificial atom journal September 2014
Orbital analysis of electronic structure and phonon dispersion in MoS 2 , MoSe 2 , WS 2 , and WSe 2 monolayers under strain journal November 2013
Bose–Einstein condensation of exciton polaritons journal September 2006
Measurement of the quantum of thermal conductance journal April 2000
Observation of the kinetic condensation of classical waves journal April 2012
Real-time observation of nonlinear coherent phonon dynamics in single-walled carbon nanotubes journal July 2006
Imaging Subsurface Reflection Phase with Quantized Electrons journal May 2002
Fourier-transform scanning tunneling microscopy investigation of the energy versus wave vector dispersion of electrons at the Au(111) surface journal May 2009
Chimera states: coexistence of coherence and incoherence in networks of coupled oscillators journal February 2015
Transient Bose–Einstein condensation of phonons journal February 2004
Surface imaging of inelastic Friedel oscillations journal May 2007
Spatial Bose‐Einstein condensation journal June 1979
Imaging the Electron-Phonon Interaction at the Atomic Scale journal October 2012
Real-space collapse of a polariton condensate journal December 2015
Bose condensation of strongly excited longitudinal electric modes journal March 1968
Phonon Scattering by Lattice Defects journal August 1963
Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping journal September 2006
Vacuum Phonon Tunneling journal October 2010
Long Range Coherence and the Action of Enzymes journal December 1970
Carrier type inversion in quasi-free standing graphene: studies of local electronic and structural properties journal June 2015
Internal Waves and Synchronized Precession in a Cold Vapor journal May 2002
Pressure-induced semiconducting to metallic transition in multilayered molybdenum disulphide journal May 2014
Mode locking and mode competition in a nonequilibrium solid-state condensate journal July 2008
Direct observation of standing wave formation at surface steps using scanning tunneling spectroscopy journal August 1993
Anomalous Raman spectra and thickness-dependent electronic properties of WSe 2 journal April 2013
Some Peculiarities of Phonon Scattering by Point Defects in Layered Crystals journal April 1997
Rayleigh-Jeans condensation of pumped magnons in thin film ferromagnets text January 2015
Chimera states: coexistence of coherence and incoherence in networks of coupled oscillators journal February 2015
Thermal interfacial transport in the presence of ballistic heat modes journal July 2014
Photoluminescence emission and Raman response of monolayer MoS_2, MoSe_2, and WSe_2 journal January 2013
Significant decrease of the lattice thermal conductivity due to phonon confinement in a free-standing semiconductor quantum well journal July 1998
Imaging Phonon Excitation with Atomic Resolution journal February 2008
Electron and Phonon Bound States and Scattering Resonances for Extended Defects in Crystals journal April 1967
Bose condensation of strongly excited longitudinal electric modes journal March 1968
Synchronization, quantum correlations and entanglement in oscillator networks journal March 2013
Thermal interfacial transport in the presence of ballistic heat modes journal July 2014
Intrinsic ripples in graphene journal September 2007
Phase Diagram for Magnon Condensate in Yttrium Iron Garnet Film journal March 2013
Lattice vibrational modes and phonon thermal conductivity of monolayer MoS 2 journal January 2014
Detection of ultrasound using a tunneling microscope journal August 1992
Condensation in globally coupled populations of chaotic dynamical systems journal January 1998
Observation of the kinetic condensation of classical waves journal April 2012
Imaging the Electron-Phonon Interaction at the Atomic Scale journal October 2012
Long Range Coherence and the Action of Enzymes journal December 1970
Thermal Expansion, Anharmonicity and Temperature-Dependent Raman Spectra of Single- and Few-Layer MoSe 2 and WSe 2 journal April 2014
Vacuum Phonon Tunneling journal October 2010
Highly Scalable, Atomically Thin WSe 2 Grown via Metal–Organic Chemical Vapor Deposition journal January 2015
Quantum signatures of chimera states journal December 2015
Detection of ultrasound using a tunneling microscope journal August 1992
The one-dimensional harmonic oscillator in the presence of a dipole-like interaction journal March 2003
Screw-Dislocation-Driven Growth of Two-Dimensional Few-Layer and Pyramid-like WSe 2 by Sulfur-Assisted Chemical Vapor Deposition journal October 2014
Observation of interlayer phonon modes in van der Waals heterostructures journal April 2015
Nonequilibrium Quantum Condensation in an Incoherently Pumped Dissipative System journal June 2006
Disorder, synchronization and phase locking in non-equilibrium Bose-Einstein condensates text January 2015
Condensation in Globally Coupled Populations of Chaotic Dynamical Systems text January 1997
Surface imaging of inelastic Friedel oscillations journal May 2007
Mode-locking and mode-competition in a non-equilibrium solid-state condensate text January 2008
The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties journal May 1969
Imaging Phonon Excitation with Atomic Resolution journal February 2008
Effect of 13 C isotope doping on the optical phonon modes in graphene: Localization and Raman spectroscopy journal June 2012
Rayleigh-Jeans Condensation of Pumped Magnons in Thin-Film Ferromagnets journal October 2015
Synchronized and desynchronized phases of coupled nonequilibrium exciton-polariton condensates journal March 2008
Rapid, non-destructive evaluation of ultrathin WSe 2 using spectroscopic ellipsometry journal September 2014
Phonon-Defect Interaction book January 1975

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