Mg-induced Si(111)-(3×2) reconstruction studied by scanning tunneling microscopy

Kubo, Osamu; Саранин, А. А.; Зотов, А. В.; Ryu, Jeong-Tak; Tani, H.; Harada, T.; Katayama, Mitsuhiro; Lifshits, V.G.; Oura, Kenjiro

doi:10.1016/s0039-6028(98)00542-1

Cited by 53 publications

(25 citation statements)

References 18 publications

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“…The HCC structure with an AEM adsorbate coverage of 1/3 monolayer ͑ML͒ leads to an odd number of valence electrons in a (3ϫ1) unit cell, and the semiconducting electronic structure is unexpected within a simple one-electron description. The observations of ϫ2 periodicities in the chain direction 8,[12][13][14][15] supported the proposition that the semiconducting character results from a Peierls instability with the formation of a charge-density wave.…”

Section: Introductionmentioning

confidence: 53%

Electronic structure of the Ca/Si(111)-(3×2)surface

2004

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The electronic structure of the Ca/Si͑111͒-(3ϫ2) surface has been investigated by angle-resolved photoelectron spectroscopy. Five surface states, none of which crosses the Fermi level, were observed in the bulk band gap, and one surface state was observed in a bulk band pocket. The dispersion features of three of the surface states in the band gap agree well with results from monovalent atom adsorbed Si͑111͒-(3ϫ1) surfaces along the chain direction. The close resemblance indicates that the origins of the surface states are the same as or quite similar to those of the (3ϫ1) surface. The two other states observed in the band gap have not been reported in the literature, and they are interpreted as surface states that occur on Ca/Si͑111͒-(3ϫ2) due to the lower coverage ͑1/6 monolayer of Ca͒. Further, based on the finite surface state dispersion in the direction perpendicular to the Ca chains, we conclude that the electronic character of this surface is not completely one dimensional.

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Section: Introductionmentioning

confidence: 53%

Electronic structure of the Ca/Si(111)-(3×2)surface

2004

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“…The similar reconstruction of the Si(111)3ϫ1-AEM LEED phase to the Si(111) 3ϫ1-AM surface was suggested based on the similarities in the LEED I-V curve observed for Mg. 4 The top Si atom densities measured for Mg and Ca, 13,14 which were the same as those for Na and Li, 10,15 supported the similarity in the reconstruction structure. The metal coverage has been assumed to be 1/3 monolayer ͑ML͒, the same as that of Si(111)3ϫ1-AM.…”

Section: Introductionmentioning

confidence: 61%

Atomic structure of the Ba-inducedSi(111)3×2reconstruction studied by LEED, STM, andab initiocalculations

Lee

Kim

et al. 2003

Phys. Rev. B

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We study the atomic structure of the Si(111)3ϫ2-Ba surface using low-energy electron diffraction ͑LEED͒, scanning tunneling microscopy ͑STM͒, and ab initio calculations. A 3ϫ2 periodicity is observed not only in STM but also in LEED. From dual-bias STM imaging and total-energy calculations, the recently proposed honeycomb chain-channel ͑HCC͒ structure ͓G. Lee et al., Phys. Rev. Lett. 87, 056104 ͑2001͔͒ is confirmed to be the most favorable among various candidate structures. Calculations varying Ba-Ba distance in the channel show that the Ba atoms interact repulsively. Diffusion of Ba atoms along the channel, occurring in a concerted manner, is found to be unlikely at room temperature. This is consistent with the STM observation that the Ba atoms occupy specific sites. However, some static disorder in site occupation is observed and shown to be energetically probable. We suggest that the Si͑111͒ surface has a tendency towards the 3ϫ1-HCC reconstruction when one electron per 3ϫ1 unit are supplied and fully saturate the Si dangling bonds.

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“…In particular, it has been revealed that in the lowest coverage regime, such adsorbates (e.g., Ba, Ca, Mg, Sm, Eu, and Yb) stabilize the well-characterized 3 · 1 and/ or 3 · 2 reconstructions, whose similarity has been confirmed by means of electron diffraction, scanning tunneling microscopy (STM), and surfacecore-level shift (SCLS) measurements ( [1][2][3][4][5][6][7][8][9][10][11] and references therein). These reconstructions have been proposed to possess the honeycomb-chainchannel (HCC) structure [1,[3][4][5][9][10][11].…”

Section: Introductionmentioning

confidence: 99%