TY  - SER
AU  - Sessi,Paolo
AU  - Nechaev,Ilya A.
AU  - Bathon,Thomas
AU  - El-Kareh,Lydia
AU  - Chulkov,Evgueni V.
AU  - Echenique,Pedro Miguel
AU  - Bode,Matthias
AU  - Silkin,Vyacheslav M.
ED  - Томский государственный университет
TI  - Direct observation of many-body charge density oscillations in a two-dimensional electron gas
KW  - квантовая интерференция
KW  - материаловедение
KW  - электронный газ двумерный
KW  - статьи в журналах
N1  - Библиогр.: 36 назв
N2  - 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000533119
ER  -