Band gap of theGe(111)c(2×8)surface by scanning tunneling spectroscopy

Autor:	Randall M. Feenstra, Karl-Heinz Rieder, Gerd Meyer, Myung Ho Kang, Jae-Yeap Lee
Rok vydání:	2006
Předmět:	Physics Band bending Band gap Scanning tunneling spectroscopy Direct and indirect band gaps Electron hole Atomic physics Condensed Matter Physics Semimetal Quasi Fermi level Energy (signal processing) Electronic Optical and Magnetic Materials
Zdroj:	Physical Review B. 73
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.73.035310
Popis:	The surface band gap of the $\mathrm{Ge}(111)c(2\ifmmode\times\else\texttimes\fi{}8)$ surface at low temperature is determined on the basis of scanning tunneling spectroscopy. Electrostatic potential computations permit evaluation of tip-induced band bending, from which a correction to the energy scale of the observed spectra is made. Parameter values in the computations are constrained by comparison of the observed spectrum with known spectral features, including high-lying conduction band features derived from first-principles computations. The surface band gap, lying between the bulk valence band maximum and the minimum of an adatom-induced surface band, is found to have a width of $0.49\ifmmode\pm\else\textpm\fi{}0.03\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2322304918a23db13bcf62b821957948 https://doi.org/10.1103/physrevb.73.035310 Zobrazit plný text záznamu