Structure and electronic structure of van der Waals interfaces at a Au(1 1 1) surface covered with a well-ordered molecular layer of n-alkanes

Mizushima, Hirotaka; Koike, Harunobu; Kuroda, Kenta; Yaji, Koichiro; Harasawa, Ayumi; Ishida, Y.; Nakayama, M.; Mase, Kenji; Mukai, Kozo; Kitazawa, Tatsuya; Kondo, Takeshi; Yoshinobu, Jun; Shin, Shik; Kanai, Kaname

doi:10.1016/j.apsusc.2020.147673

Cited by 2 publications

(11 citation statements)

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“…In adsorption systems of other organic molecules, a modified SS was clearly observed as long as the organic molecular thin film grew epitaxially. [22][23][24] However, as discussed previously for the LEED data, the MHC exhibited epitaxial growth on Au(111); thus, it is unlikely that translational symmetry disorder was the reason for the low intensity. Therefore, this reduction in the photoemission intensity is not a general phenomenon but may be unique to MHC/ Au(111).…”

Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 55%

“…These values agree well with those reported in previous works. [22,56] As shown in Figure 7c,d, MHC/Au(111), that is, the SS of Au(111), was significantly modified. The results in Figure 7c,d are discussed in detail later in the paper; here, we present three characteristic points.…”

Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 86%

“…This value is smaller than those of NTCDA/Au(111) (ΔE 0 NTCDA = 166 meV) and PTCDA/Au(111) (ΔE 0 PTCDA = 164 meV), which are weak chemisorption systems of π-conjugated molecules, and TTC/ Au(111) (ΔE 0 TTC = 145 meV) and Xe/Au(111) (ΔE 0 Xe = 146 meV), which are considered typical physical adsorption systems. [20,[22][23][24] According to the results of this comparison, the ΔE 0 MHC is the smallest and MHC/Au(111) can be interpreted as an ideal physisorption system. However, the Δk || and Δa R values of MHC/ Au(111) are significantly larger than those of NTCDA/Au(111) (Δk || NTCDA = 0.007 Å −1 ; Δa R NTCDA = 0.04 eV Å), [24] PTCDA/Au(111) (Δk || PTCDA = 0.006 Å −1 ; Δa R PTCDA = 0.03 eV Å), [24] TTC/Au(111) (Δk || TTC = 0.002 ± 0.001 Å −1 ; Δa R TTC = 0.067 ± 0.015 eV Å), [23] and Xe/Au(111) (Δk || Xe = 0.009 Å −1 ; Δa R TTC = 0.098 ± 0.017 eV Å).…”

Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 88%

“…For example, when Xe or the n-alkane molecule tetratetracontane (TTC) is adsorbed on Au(111), the adsorption structure is well-defined, and the modified SS is clearly observed, but no clear band folding has been reported. [20,22,23] However, when 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA), which are typical n-type organic semiconductors, are adsorbed on Au(111), strong band folding is observed, as in the case of MHC/Au(111). [24] A common feature of these molecules is that they contain elements with higher electronegativity than carbon, such as nitrogen and oxygen.…”

Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 99%

“…[15][16][17][18] On the other hand, the adsorption of noble gases or organic molecules on a noble metal (111) changes the strength of Rashba coupling. [19][20][21][22][23][24][25] This is interesting given that the Rashba coupling is determined by the asymmetry of the wave function of the surface electrons in a very narrow region no less than 1 Å from the nucleus of the outermost layer of the metal surface, where molecules adsorbed at least a few angstroms away from the nucleus can affect the Rashba coupling.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Moue

Kokubo

Mukai

et al. 2022

Adv Materials Inter

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Molecular adsorption on noble‐metal surfaces influences the Rashba effect in the Shockley surface state (SS), but the underlying mechanism remains unclear. Melamine is a simple molecule with a symmetric backbone consisting of a heterocyclic ring. It self‐assembles into a rosette‐like superstructures on Au(111) via double intermolecular hydrogen bonds. In this study, the growth process and structure of this hydrogen‐bonded organic framework (HOF) using low‐energy electron diffraction and X‐ray photoemission spectroscopy is revealed. Above room temperature, it is impossible for melamine to be adsorbed on Au(111) as a monomer, but it is adsorbed collectively as a hydrogen‐bonding network. The melamine HOF has a characteristic hexagonal honeycomb structure (MHC), which significantly affects both the structure and electronic states of Au(111). A theoretical approach reveals that MHC induces a hexagonal periodic deformation in the structure of Au(111) and introduces a new periodic potential in the surface electronic system. Angle‐resolved photoemission spectroscopy measurements of MHC/Au(111) indicate that the bulk sp band is strongly folded back, enhancing the Rashba splitting of the SS of Au(111). Furthermore, spin‐ and angle‐resolved photoemission spectroscopy reveals that the enhanced Rashba splitting of the SS by the MHC is the largest reported to date for the adsorption system on Au(111).

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Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 55%

Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 86%

Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 88%

Section: Modification Of Au(111) Surface State Via Formation Of Mhcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Moue

Kokubo

Mukai

et al. 2022

Adv Materials Inter

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Topological Surface State of Bi₂Se₃ Modified by Physisorption of n‐Alkane

et al. 2023

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Recently, the interface between an organic molecular layer and a topological insulator (TI) surface (Org./TI interface) has been studied to explore the possibility of multifunctional TI devices with organic molecules. Nevertheless, understanding of the electronic structure of Org./TI interfaces is insufficient. Especially, little is known about physisorption systems, where the interaction between adsorbed molecules and topological surface state (TSS) is weak. Here, we discuss an ideal physisorption system of an n-alkane molecule, n-tetratertacontane (TTC), and prototypical TI, Bi 2 Se 3 , in which the interaction between the molecule and TSS is the weakest one possible. Angle-resolved photo-emission spectroscopy results show that the energy of the Dirac cone (DC) energy band decreases by approximately 60 meV when the TTC layer is formed on Bi 2 Se 3 . The amount of energy reduction is consistent with the reduction in vacuum level at the TTC/Bi 2 Se 3 interface, valence states of Bi 2 Se 3 and the core levels of Bi 2 Se 3 observed by ultravioletand X-ray photoemission spectroscopy. Therefore, no chemical interactions, such as charge transfer, occur at the TTC/ Bi 2 Se 3 interface, but only a redistribution of charge density on the Bi 2 Se 3 surface occurs due to the Pauli repulsion between the electrons of the adsorbed TTC molecule and TSS.

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Structure and electronic structure of van der Waals interfaces at a Au(1 1 1) surface covered with a well-ordered molecular layer of n-alkanes

Cited by 2 publications

References 58 publications

Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Topological Surface State of Bi₂Se₃ Modified by Physisorption of n‐Alkane

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Structure and electronic structure of van der Waals interfaces at a Au(1 1 1) surface covered with a well-ordered molecular layer of n-alkanes

Cited by 2 publications

References 58 publications

Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Enhanced Rashba Splitting of Au(111) Surface States with Hydrogen‐Bonded Melamine‐Based Organic Framework

Topological Surface State of Bi2Se3 Modified by Physisorption of n‐Alkane

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Topological Surface State of Bi₂Se₃ Modified by Physisorption of n‐Alkane