Spin Chains and Electron Transfer at Stepped Silicon Surfaces

Aulbach, J.; Erwin, Steven C.; Claessen, R.; Schäfer, J.

doi:10.1021/acs.nanolett.6b00354

Cited by 38 publications

(72 citation statements)

References 33 publications

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“…The adsorbate induced band structure is generally electronically decoupled from the bulk bands of the host material. In particular, Au chains on regularly stepped Si(111) surfaces at various tilt angles towards the [112] direction offer a unique opportunity to modify physical properties in a controlled fashion, not provided by other atomic wire systems [26,27]. Depending on coverage and vicinality, the widths of the Au chains and their interwire spacing can be tuned, while their electronic band structures are still very similar.…”

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“…For double Au chains, nominal coverages of 0.48 ML on Si(553) and of 0.32 ML on Si(775) result. Common to all these structures is a graphitic Si honeycomb chain located at the step edges [8,27,30], which-under certain circumstances-can host ordered chains of local magnetic moments [8,9,26].Each of these systems is characterized by metallic bands that are well known from angle-resolved photoemission spectroscopy (ARPES) measurements [27]. They only disperse along the chain direction k , and have their minima at the zone boundary.…”

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“…So, 0.2 monolayers (ML) of Au on Si(557), e.g., result in the growth of single atom Au chains and a row of Si adatoms on each miniterrace with an interwire spacing of 19.2Å [27,28]. In contrast, Si(553) and Si(775)-Au host double Au chains in the center of the terrace [26,29]. The interwire spacing is 14.8Å for Si(553) and 21.3Å for Si(775) [8,27,30].…”

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“…Each terrace hosts three structural motifs. Their origin could be disentangled by a detailed analysis via STM and density functional theory, which is published elsewhere [26]. However, [26].…”

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Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

et al. 2016

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Dimensional crossover is of high relevance to understanding real-world quasi-one-dimensional (1D) systems. Here we study the collective excitations, measured as plasmon dispersions in an electron energy loss experiment, in a tunable family of model systems, namely, Au chains on stepped Si(hhk) substrates, that allow variations of chain widths and interchain spacings. We indeed observe 1D-like dispersions, but with a significant influence of higher dimensions. Surprisingly, we find that it is not the interchain coupling but the width of the conduction channel, as confirmed by tunneling spectroscopy, that dominates the excitations. DOI: 10.1103/PhysRevB.93.161408 One-dimensional (1D) electronic systems have highly attractive properties such as quantization of conductance, extremes of electronic correlation manifested by spin-charge separation, charge and spin density waves [1,2], triplet superconductivity, and Luttinger liquid behavior [3][4][5]. Due to their inherent instability, however, structural embedding and understanding of the coupling to other dimensions is of supreme importance. Indeed, many 1D properties can still be observed in these quasi-1D systems [6][7][8][9][10]. In addition, these systems host a variety of instabilities with a wealth of associated phase transitions [11]. On the other hand, the excitation spectra of these systems and their dynamics are still largely unexplored, which is particularly true for collectively excited plasmonic states.Apart from these fundamental aspects, plasmons play an important role, e.g., in sensor technology [12], improvement of quantum efficiency in photovoltaic devices [13], and even in cancer research [14]. A new field of plasmon research has been opened recently by collective excitations of low-dimensional electron gases, called sheet plasmons [15,16], which have wavelengths that are typically three orders of magnitude shorter compared to photons of the same frequency. Thus THz plasmonics on the scale of a few nanometers becomes feasible.One-dimensional (1D) metallic wires and their plasmonic excitations would be ideal for directed energy transport on the nanoscale, since quasilinear dispersion is predicted, at least in the long wavelength limit [17], for these 1D plasmons. Such dispersions have indeed been found for regular arrays of atomic wires on insulating substrates [18][19][20]. Moreover, confinement effects in these metallic subunits on the surface lead to the formation of intersubband excitations [19][20][21].Before realizing such visions, several fundamental properties of these quasi-1D plasmons need to be clarified, comprising, in particular, the question of dimensional crossover, but also the correct treatment of many-body effects, electronic correlations, and Coulomb screening [22][23][24]. These open topics led to a partly unsatisfactory description of experimental results in the past [18,19,25]. * pfnuer@fkp.uni-hannover.de To address such fundamental aspects for 1D and 2D systems, the growth of various metals in the submonolayer regime on se...

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Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

et al. 2016

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Organic Molecule Adsorption on Stepped Si–Au Surfaces: Role of Functional Group on Geometry and Electronic Structure

Hogan

Suchkova

Bechstedt

et al. 2019

Physica Status Solidi (b)

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Stepped gold-stabilized Si(111) surfaces offer much potential for self-organized assembly of one-and two-dimensional nanostructured arrays of organic molecules due to the presence of regular atomic chains of Au and Si on the surface, parallel to the step edges. In this theoretical study, the adsorption of various simple organic molecules with different functional groups on the Si(553)-Au surface has been investigated. It has been found that adsorption at the step edge site is favored by all species. If the step edge is first passivated by hydrogen, adsorption occurs on Si atoms on the terraces. Instead, adsorption on the gold chains is completely unfavored. The influence of organic molecule adsorption on the electronic band structure and surface metallicity is investigated.

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Adsorbate‐Induced Modifications in the Optical Response of the Si(553)–Au Surface

Chandola

Sanna

Hogan

et al. 2022

Physica Rapid Research Ltrs

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atoms on selected semiconducting surfaces leads to a variety of ordered, atomic-scale chain structures. [1][2][3][4][5][6][7][8][9][10][11] Au-induced reconstructions on vicinal Si(111) surfaces have been studied intensively for years, as small coverages of Au stabilize the Si terraces by the formation of Au rows, which are expected to feature exciting physical properties such as quantization of conductance, spin-charge separation, charge and spin density waves, and Luttinger liquid behavior. [12][13][14][15][16] The Si(553)-(5 Â 2)-Au surface was first investigated by Crain et al., [17] and reported to show metallic states in the electronic band structure by angle-resolved photoemission spectrosopy. Since then, numerous lines of research have emerged, dedicated to the investigation of the atomic structure, [18][19][20][21] lattice dynamics, [22] spin patterns, [23][24][25] phase transitions, [26,27] as well as electronic structure and its adsorptioninduced modifications. [28][29][30][31][32] According to our current knowledge of the system, the hightemperature phase of the Si(553)-Au surface is stable from room temperature down to about 120 K. It consists of a double Au

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Spin Chains and Electron Transfer at Stepped Silicon Surfaces

Cited by 38 publications

References 33 publications

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

Organic Molecule Adsorption on Stepped Si–Au Surfaces: Role of Functional Group on Geometry and Electronic Structure

Adsorbate‐Induced Modifications in the Optical Response of the Si(553)–Au Surface

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