Origin of metallicity in atomic Ag wires on Si(557)

Krieg, U.; Lichtenstein, T.; Brand, C.; Tegenkamp, Christoph; Pfnür, H.

doi:10.1088/1367-2630/17/4/043062

Cited by 16 publications

(26 citation statements)

References 39 publications

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“…The result is the (electronic) breakup of the Au chains, as is evident from the appearance of losses at finite energy and small k whose loss energies increase with time. Such confined states were seen recently also for Ag/Si(557) [36,37].…”

supporting

confidence: 68%

“…2(b)]. The exponentially decaying loss intensity as a function of loss energy elastic peak, known as the Drude tail, is the typical signature of the continuum of low-energy excitations in metallic systems [36], i.e., both systems are metallic, in agreement with findings from ARPES for the Si(553)-Au [27], STM [9], and theory [8]. However, it is at variance with the ARPES data for the Si(775)-Au [27] for reasons still to be explored.…”

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confidence: 99%

“…Details about the fitting procedure can be found in the Supplemental Material and are also elaborated in the Appendix of Ref. [36].…”

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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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“…Annealing the sample to 600°C for 15 s removes this state, while retaining around 90% of the surface Ag [14]; we hence assign this feature to a surface state. This state may be the signature of (residual gas) atoms weakly bonded to the step edges which extrinsically dope the Ag states on the (111) terraces as proposed in a recent study [18]. This model additionally predicts a band bending induced by the charges absorbed at the step edges.…”

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confidence: 61%

“…The dashed-dotted arrow marks the line cut position along the wire (seefigure 4and text). (c) Schematic representation of the 1 ML Ag/Si(557) structure, from[18].…”

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Electronic structure of self-assembled Ag nanowires on Si(557): spectroscopic evidence for dimensionality

et al. 2015

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We investigate the electronic structure of silver nanowires at 1 monolayer (ML) Ag coverage on a vicinal Si(557) substrate by angle-resolved photoemission spectroscopy. Fermi surface mapping reveals two-dimensional (2D) Ag-induced electron pockets, which shift to higher binding energies by n-type doping of the step edges. The electronic structure of the 1 ML Ag/Si(557) system exhibits additional 2D metallic states near the Fermi level, which may originate from substrate induced periodicities. By considering the confining potential and electronic coherence length we reconcile the seemingly conflicting views of the dimensionality in this system probed by photoemission spectroscopy, and the dispersion of collective excitations as detected by electron energy loss spectroscopy .

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Formation of Sn‐Induced Nanowires on Si(557)

Jäger

Pfnür

Fanciulli

et al. 2019

Physica Status Solidi (b)

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In this study, the growth of Sn on Si(557) surfaces by means of scanning tunneling microscopy, low energy electron diffraction and angle resolved photoemission is analyzed. Depending on the Sn submonolayer coverage, various Sn-nanowires are identified. For Sn-coverages above 0.5 ML,)-reconstructions are found. In particular, these phases cover extended (111)-areas, thus leading to an inhomogeneous refacetting of the Si(557) surface. The (223)-facets between the mini-(111) terraces reveal structures, which resemble a Â2 reconstruction along edges. The initial step structure of the Si(557) surface is maintained for Sncoverages below 0.5 ML, showing the α-Sn phase on 3 nm wide (111)terraces. In contrast to the 2D Mott state of α-Sn/Si(111), this confinement seems to quench the correlated electronic phase yielding metallic surface states at 40 K, in accordance with photoemission.

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Origin of metallicity in atomic Ag wires on Si(557)

Cited by 16 publications

References 39 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

Electronic structure of self-assembled Ag nanowires on Si(557): spectroscopic evidence for dimensionality

Formation of Sn‐Induced Nanowires on Si(557)

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