Publication

Combined ARPES and STM study of Pb/Au(111) Moiré structure: One overlayer, two symmetries

Klaus Kern, Harald Brune, Marco Grioni, Alberto Crepaldi, Markus Etzkorn, Emmanouil Frantzeskakis
2013
Journal Articles

Abstract

The structural and electronic properties of a Pb monolayer (ML) grown on Au(111) are investigated by scanning tunneling microscopy (STM) and angle resolved photoelectron spectroscopy (ARPES). We find an incommensurate Moire structure with an approximate (5.77 x 5.77) R21.5 degrees. unit cell, and two rotational domains. We observe three Pb-derived bands of p orbital character. The symmetry properties and sharpness of their Fermi surfaces are remarkably different. They reflect the different degrees of hybridization of these bands with the Au(111) bulk continuum. DOI: 10.1103/PhysRevB.87.115138

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https://infoscience.epfl.ch/entities/publication/b8ac2ae8-211e-4a69-8b75-2b793d80e6ba

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Klaus Kern, Harald Brune, Marco Grioni, Alberto Crepaldi, Markus Etzkorn, Emmanouil Frantzeskakis
2013
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b8ac2ae8-211e-4a69-8b75-2b793d80e6ba

About this result

Related concepts (32)

Scanning tunneling microscope

A scanning tunneling microscope (STM) is a type of microscope used for imaging surfaces at the atomic level. Its development in 1981 earned its inventors, Gerd Binnig and Heinrich Rohrer, then at IBM Zürich, the Nobel Prize in Physics in 1986. STM senses the surface by using an extremely sharp conducting tip that can distinguish features smaller than 0.1 nm with a 0.01 nm (10 pm) depth resolution. This means that individual atoms can routinely be imaged and manipulated.

Rotational symmetry

Rotational symmetry, also known as radial symmetry in geometry, is the property a shape has when it looks the same after some rotation by a partial turn. An object's degree of rotational symmetry is the number of distinct orientations in which it looks exactly the same for each rotation. Certain geometric objects are partially symmetrical when rotated at certain angles such as squares rotated 90°, however the only geometric objects that are fully rotationally symmetric at any angle are spheres, circles and other spheroids.

Fermi surface

In condensed matter physics, the Fermi surface is the surface in reciprocal space which separates occupied from unoccupied electron states at zero temperature. The shape of the Fermi surface is derived from the periodicity and symmetry of the crystalline lattice and from the occupation of electronic energy bands. The existence of a Fermi surface is a direct consequence of the Pauli exclusion principle, which allows a maximum of one electron per quantum state. The study of the Fermi surfaces of materials is called fermiology.

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