Direct observation of many-body charge density oscillations in a two-dimensional electron gas

Paolo Sessi, Vyacheslav M. Silkin, Ilya A. Nechaev, Thomas Bathon, Lydia El-Kareh, Evgueni V. Chulkov, Pedro M. Echenique, Matthias Bode

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Quantum interference is a striking manifestation of one of the basic concepts of quantum mechanics: the particle-wave duality. A spectacular visualization of this effect is the standing wave pattern produced by elastic scattering of surface electrons around defects, which corresponds to a modulation of the electronic local density of states and can be imaged using a scanning tunnelling microscope. To date, quantum-interference measurements were mainly interpreted in terms of interfering electrons or holes of the underlying band-structure description. Here, by imaging energy-dependent standing-wave patterns at noble metal surfaces, we reveal, in addition to the conventional surface-state band, the existence of an anomalous energy band with a well-defined dispersion. Its origin is explained by the presence of a satellite in the structure of the many-body spectral function, which is related to the acoustic surface plasmon. Visualizing the corresponding charge oscillations provides thus direct access to many-body interactions at the atomic scale.

Original languageEnglish
Article number8691
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 26 Oct 2015
Externally publishedYes

Fingerprint

Two dimensional electron gas
Charge density
electron gas
Gases
Observation
Electrons
standing waves
Band structure
oscillations
Mechanics
Acoustics
interference
Elastic scattering
Quantum theory
Metals
Surface states
Precious metals
noble metals
metal surfaces
energy bands

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Direct observation of many-body charge density oscillations in a two-dimensional electron gas. / Sessi, Paolo; Silkin, Vyacheslav M.; Nechaev, Ilya A.; Bathon, Thomas; El-Kareh, Lydia; Chulkov, Evgueni V.; Echenique, Pedro M.; Bode, Matthias.

In: Nature Communications, Vol. 6, 8691, 26.10.2015.

Research output: Contribution to journalArticle

Sessi, P, Silkin, VM, Nechaev, IA, Bathon, T, El-Kareh, L, Chulkov, EV, Echenique, PM & Bode, M 2015, 'Direct observation of many-body charge density oscillations in a two-dimensional electron gas', Nature Communications, vol. 6, 8691. https://doi.org/10.1038/ncomms9691
Sessi, Paolo ; Silkin, Vyacheslav M. ; Nechaev, Ilya A. ; Bathon, Thomas ; El-Kareh, Lydia ; Chulkov, Evgueni V. ; Echenique, Pedro M. ; Bode, Matthias. / Direct observation of many-body charge density oscillations in a two-dimensional electron gas. In: Nature Communications. 2015 ; Vol. 6.
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