Al Nucleation on Monohydride and Bare Si(001) Surfaces: Atomic Scale Patterning

Shen, T. C.; Wang, C.; Tucker, J. R.

doi:10.1103/physrevlett.78.1271

Cited by 133 publications

(74 citation statements)

References 18 publications

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“…8,9 A more efficient method for fabrication may be the deposition of adsorbate atoms in the steps on metal surfaces 10,11 or the growing of stripelike adsorbate structures either on metal 6,12 or on semiconductor 2,4,5 surfaces. The geometry of these structures can be monitored using a STM, 4,10,13 He scattering, 10 or by a field ion microscope.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous magnetization of aluminum nanowires deposited on the NaCl(100) surface

et al. 2002

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We investigate electronic structures of Al quantum wires, both unsupported and supported on the ͑100͒ NaCl surface, using the density-functional theory. We confirm that unsupported nanowires, constrained to be linear, show magnetization when elongated beyond the equilibrium length. Allowing ions to relax, the wires deform to zigzag structures with lower magnetization but no dimerization occurs. When an Al wire is deposited on the NaCl surface, a zigzag geometry emerges again. The magnetization changes moderately from that for the corresponding unsupported wire. We analyze the findings using electron band structures and simple model wires.

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Section: Introductionmentioning

confidence: 99%

Spontaneous magnetization of aluminum nanowires deposited on the NaCl(100) surface

et al. 2002

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“…Hydrogen can be used to reduce surface contamination and interface states, 9,10 and can also serve as a surfactant 11 and as an electron-beam lithography mask for nanoelectronic structures. [12][13][14][15] However, to our knowledge Si͑001͒ is the only Si surface that can be easily monohydride terminated with gaseous hydrogen. 16 On high-index surfaces the H-surface chemistry is generally complex, a consequence of the heterogeneity of the potential binding sites.…”

Section: Performing Organization Name(s) and Address(es)mentioning

confidence: 97%

A monohydride high-index silicon surface: Si(114):H-(2×1)

Laracuente

Erwin

Whitman

1999

Applied Physics Letters

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“…An example of this was explored in recent theoretical work where the possibility of a stable ''dangling bond wire'' on hydrogen passivated Si͑111͒ was discussed. 5 Another possibility is to use semiconducting 1D structures as templates for metal atoms evaporated onto the surface, the experimental feasibility of which has recently been demonstrated quite convincingly by Shen et al 6 The microscopic limit of a single row of metal atoms ͑which interact strongly with the substrate͒ will not necessarily result in a conducting wire. For example, first-principles calculations by Brocks et al show that lines of aluminum atoms on Si͑001͒ are semiconducting.…”

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Sodium-doped dimer rows on Si(001)

et al. 1997

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The stability and electronic structure of a nanowire are studied by first-principles calculations. The wire consists of a single depassivated silicon dimer row on the hydrogen passivated Si͑001͒ 2ϫ1 surface. We predict that sodium atoms evaporated onto this surface stick preferentially at the depassivated row and partially fill the empty one-dimensional states of this row. This leads to a thin metallic wire of atomic size dimensions. At room temperature the sodium atoms are mobile along the depassivated row; they become immobile at temperatures below ϳ120 K. ͓S0163-1829͑97͒50328-6͔Nanowires have attracted considerable attention as such small one-dimensional ͑1D͒ structures are expected to exhibit intriguing physical properties such as a quantized conductance or a transition to a Tomonaga-Luttinger liquid at low temperatures.1 In recent years rapid progress has been made in manipulating atoms with the scanning tunneling microscope ͑STM͒, which makes it possible to build 1D structures atom by atom.2 On metallic substrates the 1D electronic states of such structures are usually strongly mixed with the bulk metal states. In order to study unperturbed 1D effects, one would therefore prefer to use semiconducting ͑or insulating͒ substrates. Recent examples of stable 1D structures on semiconductor surfaces constructed using STM techniques, are atomic scale grooves on the Si͑111͒ surface 3 and depassivated single dimer rows on the 2ϫ1 monohydride Si͑001͒ surface.4 Both these structures are semiconducting, however, and a necessary condition for the occurrence of the low-temperature effects mentioned above is that the structures have 1D metallic character at higher ͑e.g., room͒ temperature. The challenge therefore is to construct an atomic scale metallic wire on a semiconducting substrate. There are a number of possible approaches. One could, for instance, modify a specific surface in order to create a wire which is intrinsically metallic. An example of this was explored in recent theoretical work where the possibility of a stable ''dangling bond wire'' on hydrogen passivated Si͑111͒ was discussed.5 Another possibility is to use semiconducting 1D structures as templates for metal atoms evaporated onto the surface, the experimental feasibility of which has recently been demonstrated quite convincingly by Shen et al. 6 The microscopic limit of a single row of metal atoms ͑which interact strongly with the substrate͒ will not necessarily result in a conducting wire. For example, first-principles calculations by Brocks et al. show that lines of aluminum atoms on Si͑001͒ are semiconducting.7 A third approach is to dope semiconducting 1D structures. Some of these structures have states inside the bulk band gap, which have a pure 1D character. Transferring electrons ͑holes͒ from dopant atoms to empty ͑filled͒ 1D states would result in conducting wires.In this paper we propose a specific realization of this last approach and study it by means of first-principles calculations. We start from a single depassivated dimer ͑DD͒ row on th...

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Al Nucleation on Monohydride and Bare Si(001) Surfaces: Atomic Scale Patterning

Cited by 133 publications

References 18 publications

Spontaneous magnetization of aluminum nanowires deposited on the NaCl(100) surface

Spontaneous magnetization of aluminum nanowires deposited on the NaCl(100) surface

A monohydride high-index silicon surface: Si(114):H-(2×1)

Sodium-doped dimer rows on Si(001)

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