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Matsuda, Ichiro; Morikawa, Hirofumi; Liu, Canhua; Ohuchi, Satoru; Hasegawa, Shuji; Okuda, Takashi; Kinoshita, Toyohiko; Ottaviani, Carlo; Cricenti, A.; D’Angelo, M.; Soukiassian, P.; Lay, G. Le

doi:10.1103/physrevb.68.085407

Cited by 63 publications

(52 citation statements)

References 29 publications

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“…2 is in sharp contrast to the recent photoemission study of the same surface, in which a splitting between S 2 and S 3 with a gap as large as 0.22± 0.07 eV was reported at a reduced sample temperature ͑120 K͒. 5 Since the sample preparation method and measurement geometries in Ref. 5 were very similar to what we have used, it is important to find the reason for the discrepancy.…”

contrasting

confidence: 49%

“…The transition temperature is believed to be somewhat below 150 K based on photoemission and x-ray diffraction measurements. 5,10 The hexagonal appearance of the empty-state STM images and the IET model was supported by a theoretical calculation, 3 which found that the IET model is more favorable, energetically, than the HCT model. As a consequence of the two different Ag trimers in the IET structure, the plane containing the surface normal and the ͓112͔ direction is no longer a mirror plane.…”

mentioning

confidence: 75%

“…Due to the symmetry breaking, the S 2 and S 3 surface states, which are degenerate at the K point in the HCT model, were predicted to split in the IET model. 2,3 In a recent angle-resolved photoemission study, 5 the authors reported LT ͑120 K͒ spectra with a clear splitting of S 2 and S 3 at the K point of the ͱ 3 ϫ ͱ 3 SBZ. In addition, their valenceband spectra did not show any specific symmetry for S 2 and S 3 in the plane containing the ͓112͔ direction and the surface normal.…”

mentioning

confidence: 99%

“…5 Since the sample preparation method and measurement geometries in Ref. 5 were very similar to what we have used, it is important to find the reason for the discrepancy. Even though the spectrum only presents a single peak at the K point ͑ e =18°͒, one could suspect that the peak consists of two separate components.…”

mentioning

confidence: 99%

“…Instead of relying on the sample orientation determined by reflection high-energy electron diffraction 5 or LEED, we have followed the dispersion of the surface-state bands themselves to find the correct angles for the K point. Figure 2͑c͒ displays a set of spectra recorded with an incidence angle of 45°.…”

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confidence: 99%

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Ag∕Si(111)3×3: Surface band splitting and the inequivalent triangle model

Zhang

Uhrberg

2006

Phys. Rev. B

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confidence: 49%

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confidence: 75%

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confidence: 99%

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confidence: 99%

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Ag∕Si(111)3×3: Surface band splitting and the inequivalent triangle model

Zhang

Uhrberg

2006

Phys. Rev. B

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Reflection high‐energy positron diffraction study of surface super‐structures

Kawasuso¹,

Fukaya

Hayashi

et al. 2007

Phys. Status Solidi (c)

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In this work, we studied a few surface super-structures using reflection high-energy positron diffraction (RHEPD). We found that the RHEPD pattern from the Si(111)-7×7 surface exhibits different features from that of electron diffraction. The difference is explained as a strong thermal diffuse scattering of positrons at the first surface layer. We also studied the phase transition of the Si(111)-√3×√3-Ag surface. We found that the surface sensitive diffraction spots exhibit peculiar temperature dependences. Based on theoretical considerations, we interpreted the temperature dependences in terms of the order-disorder phase transition. Furthermore, we succeeded in determining a unique structure of the Si(111)-√21×√21-Ag surface.1 Introduction One important aspect in the interactions between high-energy positrons and matter is the negligibly small correlation effect. Therefore, the diffraction processes of high-energy positrons are described mainly using the Hartree-Fock (crystal) potential. Strictly to say, the scattering cross sections and hence atomic form factors for positrons and electrons are different due to the different phase shifts of the scattered waves. In high-energy region, however, the lowest-order Born approximation is adequate. Therefore, the crystal potential for positrons may be close to the absolute value of that for electrons. The crystal potential for positrons is thus positive. Consequently, a positron beam is totally reflected at the first surface layer when small enough incident angles. The total reflection never occurs in the case of electrons. The reflection high-energy positron diffraction (RHEPD) is suited to study the surface properties without any disturbances from the bulk [1].Using the electro-magnetic lenses we developed a positron beam, which is more coherent as compared to the previous beam [2]. This leads to the successful observation of the fractional order diffraction spots. In this article, we report the difference in positron and electron diffraction patterns. As the applications of RHEPD, we also report the observation of the phase transition of the Si(111)-√3×√3-Ag which is still under the debate [3][4][5][6][7] and the determination of the structure of the Si(111)-√21×√21-Ag [8][9][10][11].

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Optical second‐harmonic generation studies of Si(111)‐√3×√3‐Ag and Si(111)‐3×1‐Ag grown on vicinal Si(111)

Jacob

Silva

Fleischer

et al. 2008

Phys. Status Solidi (c)

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Optical second‐harmonic generation (SHG) studies, at room temperature, of Si(111)‐√3×√3‐Ag and Si(111)‐3×1‐Ag structures grown on vicinal Si(111) are reported. The vicinal substrate produces a predominant domain on the (111) terrace that reveals the full surface symmetry. The ratio of p‐ to s‐output polarization intensity of these Ag structures was found to be very large, requiring precise alignment procedures. For the Si(111)‐3×1‐Ag structure it is shown, using s‐output measurements, that there are tensor components making significant contributions to the SH intensity that are identically zero in the presence of a mirror plane. This proves that the 3×1‐Ag structure does not possess such a mirror plane, in agreement with a previous SHG study of this structure grown on a singular surface. These results are contrasted with those from Si(111)‐√3×√3‐Ag, where the response is consistent with the presence of a mirror plane. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Electronic evidence of asymmetry in theSi(111)3×3<

Cited by 63 publications

References 29 publications

Ag∕Si(111)3×3: Surface band splitting and the inequivalent triangle model

Ag∕Si(111)3×3: Surface band splitting and the inequivalent triangle model

Reflection high‐energy positron diffraction study of surface super‐structures

Optical second‐harmonic generation studies of Si(111)‐√3×√3‐Ag and Si(111)‐3×1‐Ag grown on vicinal Si(111)

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