Silicon adatom chains and one-dimensionally confined electrons on 4H-SiC(1-102): The (2x1) reconstruction

• The electronic and atomic structure of the 4H-SiC surface was investigated. Photoemission data indicate that the surface contains about 2 Si layers on top of the bulk layers. Scanning tunneling microscopy images show that these adlayers are terminated by an ordered array of adatom chains separated by the unit cell size. An electronic surface state located at a binding energy of 0.8 eV shows one-dimensional confinement with dispersion only along the chains. Based on the experimental observations, a tentative (2 × 1) surface model is derived with the surface terminated by alternating chains of Si adatoms and Si dimers in between.

Nyckelord

Low energy electron diffraction (LEED); Angle resolved photoemission; Scanning tunneling microscopy; Surface relaxation and reconstruction; Surface electronic phenomena (work function

surface potential

surface states

etc.); Silicon carbide; Single crystal surfaces; Adatoms

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