Highly resolved non-contact atomic force microscopy images of the Sn/Si(111)-() surface

Sugimoto, Yoshiaki; Abe, Masayuki; Hirayama, Shinji; Morita, Seizo

doi:10.1088/0957-4484/17/16/039

Cited by 18 publications

(11 citation statements)

References 19 publications

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“…High-resolution insets reveal the characteristic double-dimer structure for both n-2✓3Sn and B-2✓3Sn. The two dimers are symmetric but differ in height, consistent with previous results19202122. The close similarity between the n-2✓3Sn and B-2✓3Sn structures is corroborated by the nearly identical I(V) spectra in low-energy electron diffraction as well as their identical melting temperature19 (see Supplementary Notes 3 and 4).…”

Section: Resultssupporting

confidence: 89%

Hidden phase in a two-dimensional Sn layer stabilized by modulation hole doping

Ming

Mulugeta

et al. 2017

Nat Commun

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Semiconductor surfaces and ultrathin interfaces exhibit an interesting variety of two-dimensional quantum matter phases, such as charge density waves, spin density waves and superconducting condensates. Yet, the electronic properties of these broken symmetry phases are extremely difficult to control due to the inherent difficulty of doping a strictly two-dimensional material without introducing chemical disorder. Here we successfully exploit a modulation doping scheme to uncover, in conjunction with a scanning tunnelling microscope tip-assist, a hidden equilibrium phase in a hole-doped bilayer of Sn on Si(111). This new phase is intrinsically phase separated into insulating domains with polar and nonpolar symmetries. Its formation involves a spontaneous symmetry breaking process that appears to be electronically driven, notwithstanding the lack of metallicity in this system. This modulation doping approach allows access to novel phases of matter, promising new avenues for exploring competing quantum matter phases on a silicon platform.

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Section: Resultssupporting

confidence: 89%

Hidden phase in a two-dimensional Sn layer stabilized by modulation hole doping

Ming

Mulugeta

et al. 2017

Nat Commun

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“…The top most layer includes two inequivalent pairs of Sn adatoms. [15][16][17][18][19] The Sn-2 √ 3 surface is an interesting substrate for growing perylene derivatives. First, the size of its unit cell (13.3 × 13.3 Å 2 ) is of comparative size to PTCDA (14.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling microscopy study of PTCDI on Sn/Si(111)-23×23

Emanuelsson

Soldemo

Johansson

et al. 2019

The Journal of Chemical Physics

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Perylene tetracarboxylic diimide molecules were evaporated onto a Sn/Si(111)-2 √ 3 × 2 √ 3 surface and studied using scanning tunneling microscopy (STM) and low energy electron diffraction. At low coverages, single molecules are locked into specific adsorption geometries, which are investigated in detail using high resolution STM. The electronic structure of these individual molecules was studied using bias dependent STM images. The molecules form 1D rows that become more common with increasing coverages. Possible intermolecular O• • • H interactions within the rows have been identified. At around half of a monolayer (ML), the rows of molecules interact with each other and form a commensurate 4 √ 3 × 2 √ 3 reconstruction. In a complete monolayer, several structures emerge as molecules fill in the space between the 4 √ 3 × 2 √ 3 stripes. Possible intermolecular interactions within the 1 ML structures have been discussed. At coverages above 1 ML, the growth is characterized by island growth, where the molecules are arranged according to the canted structure within the layers.

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“…There is to this date no consensus about the exact atomic configuration of the surface. Scanning probe microscopy studies and photoelectron spectroscopy studies suggest that the surface has a double layer of Sn atoms, a top layer consisting of two inequivalent Snpairs and a bottom layer consisting of 8-10 Sn atoms [8][9][10][11][12]. The simpler Sn/Si(111)-surface contains dangling bonds which causes a strong chemical reaction that causes the PTCDA to stand up on the surface, which does not allow for ordered growth at low coverages [13].…”

Section: Introductionmentioning

confidence: 99%

Photoelectron spectroscopy studies of PTCDI on Ag/Si(111)-3×3

Emanuelsson

Johansson

Zhang

2018

The Journal of Chemical Physics

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3,4,9,10-perylene tetracarboxylic diimide molecules were evaporated onto a Ag/Si(111)-3×3 surface and studied using photoelectron spectroscopy and near edge X-ray absorption fine structure (NEXAFS). All core levels related to the imide group of the molecules showed a partial shift to lower binding energies at low coverages. In NEXAFS spectra, the first transitions to the unoccupied states were weaker at low coverages compared to thicker films. Also, extra states in the valence band between the regular highest occupied molecular orbital and the Fermi level were found at low coverages. These changes were explained by two types of molecules. Due to charge transfer from the surface, these two types have different interactions between the imide group and the substrate. As a result, one type has a partially filled lowest unoccupied molecular orbital while the other type does not.

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Highly resolved non-contact atomic force microscopy images of the Sn/Si(111)-() surface

Cited by 18 publications

References 19 publications

Hidden phase in a two-dimensional Sn layer stabilized by modulation hole doping

Hidden phase in a two-dimensional Sn layer stabilized by modulation hole doping

Scanning tunneling microscopy study of PTCDI on Sn/Si(111)-23×23

Photoelectron spectroscopy studies of PTCDI on Ag/Si(111)-3×3

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