Scanning Tunneling Microscopy of Atomic Scale Phonon Standing Waves in Quasi-freestanding WSe 2 Monolayers

Igor Altfeder, Sarah M. Eichfeld, Rachel D. Naguy, Joshua Alexander Robinson, Andrey A. Voevodin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Using scanning tunneling microscopy (STM) we observed atomic scale interference patterns on quasi-freestanding WSe2 islands grown on top of graphene. The bias-independent double atomic size periodicity of these patterns and the sharp Brillouin zone edge revealed by 2D STM Fourier analysis indicate formation of optical phonon standing waves due to scattering on intercalating defects supporting these islands. Standing wave patterns of both synchronized and non-synchronized optical phonons, corresponding to resonant and non-resonant phonon scattering regimes, were experimentally observed. We also found the symmetry breaking effect for individual phonon wave packets, one of the unique features distinguishing phonon standing waves. We show that vibrational and electronic anharmonicities are responsible for STM detection of these patterns. A significant contribution to the interference contrast arises from quantum zero-point oscillations.

Original languageEnglish (US)
Pages (from-to)1645-1650
Number of pages6
JournalMRS Advances
Volume1
Issue number22
DOIs
StatePublished - Jan 1 2016

Fingerprint

Scanning tunneling microscopy
standing waves
scanning tunneling microscopy
Monolayers
Wave packets
Phonon scattering
Fourier analysis
Graphite
Phonons
interference
Graphene
scattering
Brillouin zones
Scattering
wave packets
periodic variations
broken symmetry
Defects
graphene
phonons

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Altfeder, Igor ; Eichfeld, Sarah M. ; Naguy, Rachel D. ; Robinson, Joshua Alexander ; Voevodin, Andrey A. / Scanning Tunneling Microscopy of Atomic Scale Phonon Standing Waves in Quasi-freestanding WSe 2 Monolayers In: MRS Advances. 2016 ; Vol. 1, No. 22. pp. 1645-1650.
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Scanning Tunneling Microscopy of Atomic Scale Phonon Standing Waves in Quasi-freestanding WSe 2 Monolayers . / Altfeder, Igor; Eichfeld, Sarah M.; Naguy, Rachel D.; Robinson, Joshua Alexander; Voevodin, Andrey A.

In: MRS Advances, Vol. 1, No. 22, 01.01.2016, p. 1645-1650.

Research output: Contribution to journalArticle

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AB - Using scanning tunneling microscopy (STM) we observed atomic scale interference patterns on quasi-freestanding WSe2 islands grown on top of graphene. The bias-independent double atomic size periodicity of these patterns and the sharp Brillouin zone edge revealed by 2D STM Fourier analysis indicate formation of optical phonon standing waves due to scattering on intercalating defects supporting these islands. Standing wave patterns of both synchronized and non-synchronized optical phonons, corresponding to resonant and non-resonant phonon scattering regimes, were experimentally observed. We also found the symmetry breaking effect for individual phonon wave packets, one of the unique features distinguishing phonon standing waves. We show that vibrational and electronic anharmonicities are responsible for STM detection of these patterns. A significant contribution to the interference contrast arises from quantum zero-point oscillations.

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