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Direct observation of many-body charge density oscillations in a two-dimensional electron gas P. Sessi, V. M. Silkin, I. A. Nechaev [et.al.]

Contributor(s): Sessi, Paolo | Nechaev, Ilya A | Bathon, Thomas | El-Kareh, Lydia | Chulkov, Evgueni V | Echenique, Pedro Miguel | Bode, Matthias | Silkin, Vyacheslav M | Томский государственный университет Физический факультет Кафедра физики металловMaterial type: ArticleArticleSubject(s): квантовая интерференция | материаловедение | электронный газ двумерныйGenre/Form: статьи в журналах Online resources: Click here to access online In: Nature communications Vol. 6, Art. № 8691. P. 1-6-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.
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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.

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