Core-level photoemission of the Si(111)–-Ag surface using synchrotron radiation

Tong, Xiao; Ohuchi, Satoru; Tanikawa, Takehiro; Harasawa, Ayumi; Okuda, Takashi; Aoyagi, Yoshinobu; Kinoshita, Toyohiko; Hasegawa, Shuji

doi:10.1016/s0169-4332(01)00854-6

Cited by 9 publications

(11 citation statements)

References 18 publications

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“…The metallic line shape was addressed in the recent photoemission studies of the Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface. 18,19 In the right panel the spectra obtained after 600°C annealing show steep edges, indicating a nonmetallic surface. Obviously, the asymmetric tail in the left panel is related to the metallic surface state S 1 , which is caused by extra Ag on the ͱ 3 ϫ ͱ 3 surface.…”

Section: Resultsmentioning

confidence: 98%

“…15,16 Later on, this result was questioned by many surface sensitive measurements, such as STM, corelevel spectroscopy, and inverse photoemission. [17][18][19][20] Those re- ports concluded that the Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface instead shows a metallic behavior. Here we present our photoemission data and show that the metallic behavior of Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 is related to the extra Ag.…”

Section: Resultsmentioning

confidence: 99%

“…2. In a recent photoemission study, 19 the authors presented LT Si 2p spectra of the Ag-induced ͱ 21ϫ ͱ 21 surface. Since their initial ͱ 3 ϫ ͱ 3 spectra show two broad features and the ͱ 21ϫ ͱ 21-Ag spectrum is also featureless, there is a large uncertainty in the decomposition of the spectra.…”

Section: Resultsmentioning

confidence: 99%

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Surface electronic structure ofK- andCs-induced21×<

2004

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A ͱ 21ϫ ͱ 21 reconstruction has been formed by adding either K or Cs atoms on the Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface at 120 K. The electronic structures of these surfaces have been studied by angle-resolved valence band and core-level spectroscopy. In similarity with Ag or Au adatoms, the presence of K or Cs adatoms on Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 results in a metallic ͱ 21ϫ ͱ 21 surface. The formation of two surface bands near the Fermi level can be explained by band folding of a partially occupied surface band originating from the underlying Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface. A detailed analysis of the Si 2p core-level spectra of the above surfaces is presented and compared to the Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface. In the case of Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3, we find that the metallic tail of the Si 2p spectra is related to extra Ag. Both the valence band and the Si 2p spectra of the Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface show that the surface is semiconducting after annealing at ϳ600°C.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Surface electronic structure ofK- andCs-induced21×<

2004

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“…[25]. For a single 2p vacancy (2p 1 ) we have performed a weighted average over the five lowest of recent level-widths measurements [26][27][28][29][30]. The resulting level width is 0.048±0.022 eV corresponding to a decay time of 13.7 fs.…”

Section: Auger Peak-energy Shiftsmentioning

confidence: 99%

Search for short-time phase effects in the electronic damage evolution – A case study with silicon

Schiwietz¹,

Czerski²,

Hellhammer³

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

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This work focusses on the production and decay properties of inner-shell vacancies and valence-band excitations induced by swift highly charged ions interacting with amorphous and crystalline Si. High resolution electron spectra have been taken for fast heavy ions at 1.78 to 5 MeV/u as well as for electrons of similar velocity incident on atomically clean Si targets of well defined phase. Various Auger-electron structures are analyzed concerning their width, their intensity and exact peak position. All measured peaks show a small shift towards lower energy when the charge of the projectile is increased. This finding is an indication for a nuclear-track potential inside the ion track. A detailed analysis of the Auger-electron spectra for amorphous Si and crystalline Si(111) 7x7 points to a small but significant phase effect in the short-time dynamics of ion tracks.

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“…8,[10][11][12][13][14][15] At low coverages, two distinct STM features, called "star" and "propeller," are observed. [10][11][12] As the dopant coverage increases to ϳ0.14 ML, the ͱ 21ϫ ͱ 21 superstructure 1,8,9,[12][13][14][15][16][17][18][19][20][21][22][23][24][25] with an anomalously high surface conductivity emerges. 25 Interestingly, both the noble metal 1 ͑Ag, Au, and Cu͒ and alkali metal 15,16 ͑Na͒ depositions on the ͱ 3-Ag surface show the very similar STM features and electronic band structures, indicating that the atomic structures for the monovalent adatoms as well as the origin for the band structure modifications can basically be the same.…”

Section: Introductionmentioning

confidence: 99%

Immersion structures of monovalent metal adatoms onAg∕Si(111)3×3: First-principles study

2007

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We present first-principles calculations for the adsorption of monovalent metal adatoms ͑noble and alkali metals͒ on the Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface, a tunable two-dimensional electron gas system by electron-doping adatoms. The noble metals and Li immerse spontaneously into the topmost Ag layer with a significant amount of structural relaxation. The clustering of Ag adatoms is investigated, and the cluster with three-immersedadsorbates is found to be the most stable one. The calculated atomic structures with one and three immersed Ag adatoms well reproduce the measured scanning tunneling microscopy features at low dopant coverages, called "star" and "propeller," respectively. The present results provide a unified view of the atomic structures of metal adatoms on the Ag/ Si͑111͒ ͱ 3 ϫ ͱ 3 surface, which play an important role in the surface electronic states.

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Core-level photoemission of the Si(111)–-Ag surface using synchrotron radiation

Cited by 9 publications

References 18 publications

Surface electronic structure ofK- andCs-induced21×<

Surface electronic structure ofK- andCs-induced21×<

Search for short-time phase effects in the electronic damage evolution – A case study with silicon

Immersion structures of monovalent metal adatoms onAg∕Si(111)3×3: First-principles study

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