Atomic and Electronic Structure of the (2x1) and c(2x2) 4H-SiC(1(1)over-bar02) Surfaces

• The atomic and electronic structure of 4H-SiC(1 1 02) surfaces were investigated usingscanning tunneling microscopy (STM), low-energy electron diffraction (LEED) and photoemission(PES). Two well ordered phases existing on this surface, i.e. (2×1) and c(2×2) are discussed. The(2×1) phase consists of a Si adlayer which is topped by an array of ordered Si-nanowires withelectronic states confined to one dimension. For the c(2×2) phase STM indicates the presence ofadatoms and PES a surface composition close to bulk SiC stoichiometry. A detailed atomic modelfor this c(2×2) phase is proposed.

Nyckelord

atomic structure

electronic structure

4H-SiC(1 1 02)

photoemission

STM

LEED

one dimension

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