Observation of an adlayer-driven substrate reconstruction in Cu-Pt(111)

Holst, Bodil; Nohlen, M.; Wandelt, K.; Allison, W.

doi:10.1103/physrevb.58.r10195

Cited by 27 publications

(27 citation statements)

References 15 publications

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“…A similar network of dislocation lines has been found on the Pt(111) surface, but there it is thermodynamically stable only at a sufficiently large Pt pressure in the gas phase [3,4] or at high temperatures [5]. A similar densification of the surface via dislocation lines is also found, if foreign atoms are offered to Pt(111) such as Co [6,7], Cu [8] or Cr [9]. This enables an elegant pathway to establish one dimensional (1D) structures of a certain chemical species, embedded in a chemically different matrix, via self-organization.…”

Section: Introductionsupporting

confidence: 57%

“…This is much larger than in any bonding configuration of pure silicon, so one can assume that the chains are not the result of Si-Si interactions, but rather governed by the Si-Pt interactions. Assuming additionally that the main driving force for the Si embedment is the increase of electron density in the Pt surface [3][4][5][6][7][8][9], Si atoms should be placed at positions that barely dusturb the Pt lattice. Two such positions, depicting the ionic radius of the different atoms via its symbol size, are shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

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Protection of one-dimensional Si chains embedded in Pt(111) and protected by a hexagonal boron-nitride monolayer

et al. 2019

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Using scanning tunneling microscopy, we show that Si deposition on Pt(111) at 300K leads to a network of one-dimensional Si chains. On the bare Pt(111) surface, the chains, embedded into the Pt surface, are orientated along the 112 -direction. They disappear within a few hours in ultrahigh vacuum due to the presence of residual gas. Exposing the chains to different gases deliberately reveals that CO is largely responsible for the disappearance of the chains. The chains can be stabilized by a monolayer of hexagonal boron nitride, which is deposited prior to the Si deposition. The resulting Si chains are rotated by 30 • with respect to the chains on the bare Pt(111) surface and survive even an exposure to air for 10 minutes. arXiv:1806.02174v1 [cond-mat.mes-hall]

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Section: Introductionsupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Protection of one-dimensional Si chains embedded in Pt(111) and protected by a hexagonal boron-nitride monolayer

et al. 2019

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“…Additionally, the bandwidth of the 3d states for the Cu monolayer is larger than for the case of the monatomic chain, due to the higher atomic coordination. Although the unit cell would not change for ideal row by row growth fashion, it is known that pseudomorphic growth is not maintained at full monolayer coverage in this system [13]. The extremal points of the band dispersion, ÿK and ÿM, correspond to a wave vector of 1:50 A ÿ1 and 1:30 A ÿ1 , respectively.…”

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confidence: 90%

One-Dimensional3dElectronic Bands of Monatomic Cu Chains

et al. 2008

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The electronic structure of an array of monatomic Cu chains grown on the Pt(997) surface has been examined by angle-resolved photoemission. The monatomic wires exhibit properties associated with 3d electron confinement in one dimension. Along the wire direction, the 3d bands states display a dispersive character, with periodicity in reciprocal space defined by the wire array geometry. These observations are compared and analyzed with ab initio calculations based on the full-potential linearized augmented planewave method. DOI: 10.1103/PhysRevLett.101.036807 PACS numbers: 73.20.ÿr, 73.21.Hb, 79.60.Jv The controlled design of the atomic geometry at surfaces opens new pathways to the physical realization of lowdimensional electronic networks with novel and tunable properties. Through nanoscale structuring and selforganization processes, metallic systems can be tailored on surfaces with given geometry, suitable periodicity, and large lateral coherence [1][2][3]. Although the interactions in the surface plane and with the underlying atomic layers cannot be generally neglected, these structures offer attractive ways to examine electronic properties in confined geometries. In some particular structures, artificially constructed at surfaces, the electronic states of the constituent elements can be sufficiently laterally decoupled in the surface plane to develop a one-dimensional (1D) character.The geometry of vicinal surfaces often gives rise to a preferential 1D direction of growth of the deposited material with a high degree of order [4,5]. An exemplary case is Au atoms forming parallel chains on macroscopic areas of the Si(111) vicinal surface. In photoemission studies, they exhibit a number of exotic features [6], such as Peieris transitions, periodic lattice distortions, and charge density waves. These effects are thought to be intimately related to the perfect ''nesting'' of the Fermi surface in a partially filled 1D band associated with Au sp-electrons. Onedimensional delocalized surface states are also formed along atomic step edges of vicinal noble metal surfaces. By simply varying the spacing between step edges, acting as a barrier for electron propagation, different degrees of lateral confinement are achieved for sp-derived states on the terraces of metal surfaces [7,8].While several investigations have addressed the behavior of 1D extended states formed by sp-derived levels, until now there has been no comparably detailed study of surface nanostructures involving d-electrons. The d-electrons have wave functions more localized near the atomic core, experience a larger correlation effect, and have much smaller energy dispersions and group velocities, exhibiting heavier electron masses. This imposes constraints on the degree of coherence to shorter length scales, as well as on the required sensitivity of the measurements in probing smaller bandwidths. The larger Coulomb interaction and the reduction of the bandwidth profoundly influence the properties of 1D systems [9]. For instance, the d-electrons, which ...

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“…The layer-dependent strain relaxation of the lattice misfit between Pt and Cu ((a Cu − a Pt )/a Pt = −7.9%, with a Pt = 3.92Å, a Cu = 3.61Å) gives rise to different Cu(111)-based surface morphologies. The first Cu ML (not shown in figure 1(a)) grows pseudomorphic to the substrate [27]. On the second ML Cu atoms assemble in two energetically equivalent structures, characterized by a labyrinth-like motif and a trigonal network of partial surface dislocations [28] that coexist on the 2 ML terrace.…”

mentioning

confidence: 99%

“…A model of this structure, displaying the registry relation between film and substrate, 6 The Cu coverage calibration was performed by incremental depositions of small (∼0.1 ML) Cu amounts. The formation of the second ML was detected by the nucleation of new islands, displaying characteristic surface superstructures, on top of the first completed pseudomorphic ML [27]. 7 The nearest neighbor distances in Pt(111) and Cu(111) planes are 2.77Å and 2.55Å, respectively.…”

mentioning

confidence: 99%

Electronic states of moiré modulated Cu films

Moras

Sheverdyaeva

Carbone

et al. 2012

J. Phys.: Condens. Matter

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We examined by low-energy electron diffraction and scanning tunneling microscopy the surface of thin Cu films on Pt(111). The Cu/Pt lattice mismatch induces a moiré modulation for films from 3 to about 10 ML thickness. We used angle-resolved photoemission spectroscopy to examine the effects of this structural modulation on the electronic states of the system. A series of hexagonal-and trigonal-like constant energy contours is found in the proximity of the Cu(111) zone boundaries. These electronic patterns are generated by Cu sp-quantum well state replicas, originating from multiple points of the reciprocal lattice associated with the moiré superstructure. Layer-dependent strain relaxation and hybridization with the substrate bands concur to determine the dispersion and energy position of the Cu Shockley surface state.

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Observation of an adlayer-driven substrate reconstruction in Cu-Pt(111)

Cited by 27 publications

References 15 publications

Protection of one-dimensional Si chains embedded in Pt(111) and protected by a hexagonal boron-nitride monolayer

Protection of one-dimensional Si chains embedded in Pt(111) and protected by a hexagonal boron-nitride monolayer

One-Dimensional3dElectronic Bands of Monatomic Cu Chains

Electronic states of moiré modulated Cu films

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