Role of orbital overlap in atomic manipulation

Jarvis, Samuel; Sweetman, Adam; Bamidele, Joseph; Kantorovich, Lev; Moriarty, Philip

doi:10.1103/physrevb.85.235305

Cited by 30 publications

(44 citation statements)

References 25 publications

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“…Oxide-covered Si tips were proposed to explain the images of Si(111)-(7×7) exhibiting such weak corrugation. The influence of the tip chemical reactivity in the particular case of the semiconductor Si(100) surface was recently studied by Sharp et al 20 Furthermore, Jarvis et al 21 investigated the role of the orbital alignment between the tip and hydrogen-passivated Si(100) surface in the atom manipulation process based on the atomic exchange mechanism.…”

Section: Introductionmentioning

confidence: 99%

Force mapping on a partially H-covered Si(111)-(7×7) surface: Influence of tip and surface reactivity

et al. 2013

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We report force mapping experiments on Si(111)-(7×7) surfaces with adsorbed hydrogen, using atomic force microscopy at room temperature supported by density functional theory (DFT) simulations. On the basis of noncontact atomic force microscopy (NC-AFM) images as well as force versus distance curves measured over both hydrogen-passivated and bare Si adatoms, we identified two types of tip termination, which result in different modes of interaction with the surface. The statistics of the tip dependence of the measured forces, which are effectuated using various tip states with different cantilevers, reveal the typical values of the force and their distribution in the two characteristic interaction modes. The experimental results are corroborated by DFT calculations performed for different tip structures. As a reactive tip, the dimer-terminated Si tip yields results in satisfactory agreement with experimental force curves for hydrogen-passivated and nonpassivated Si adatom sites. An oxidized Si dimer tip that bears a hydroxyl group on its apex reproduces well the experimental force curves acquired by nonreactive tips. This tip model could thus be used to interpret the experimentally obtained weak image contrast for the Si(111)-(7×7) surface. The forces are thought to arise as a result of a weak electrostatic interaction involving a permanent dipole at the tip apex enhanced by the charge density redistribution due to the interaction with surface adatoms.

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Section: Introductionmentioning

confidence: 99%

Force mapping on a partially H-covered Si(111)-(7×7) surface: Influence of tip and surface reactivity

et al. 2013

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“…All experimental work will involve III-V(110) substrates due to both their ease of preparation via cleavage and lack of mid-gap surface states (at least for well-cleaved samples), and will be carried out under ultrahigh vacuum conditions and at a temperature of either 77 K or 5K. In line with our recent work [5,7], to eliminate thermal drift we will use an atom-tracking facility developed by Philipp Rahe [8] and co-workers [32]. As discussed below, the atom-tracking capability is essential in order to accurately measure force-distance curves for their subsequent comparison to those generated by DFT calculations.…”

Section: Programme and Methodologymentioning

confidence: 99%

“…3 and, for example, our recent force-field mapping of hydrogen-bonded assemblies described in Sweetman et al [5] in the vicinity of anions, cations, and surface adsorbates. The acquisition of atom-tracking enabled 3D maps will provide detailed insights into the symmetry of the potential energy surface, including, in particular, the role of orbital orientation [8], and this will play a key role in the next stage of our research programme: atomic manipulation.…”

Section: Iiia Chemical Contrast On Iii-v Surfacesmentioning

confidence: 99%

Mechanochemistry at the Single Bond Limit: Towards `Deterministic Epitaxy'

Moriarty¹,

Jarvis²,

Kantorovich³

et al. 2015

The Winnower

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“…1 shows a number of research highlights spanning three aspects of our track record of central importance to this proposal, namely tip control and characterization [4], ultrahigh resolution imaging and spectroscopy [5], and atomic manipulation [6]. Other key results over the last five years include the imaging of back-bonding at a semiconductor surface [7],elucidating the role of orbital overlap in atomic manipulation [8],and the development of strategies and protocols for the intelligent automation of probe optimization [9].…”

Section: Track Recordmentioning

confidence: 99%

“…He has, however, also been a vocal and persistent critic of the Pathways to Impact statement and associated National Importance requirement for quite some time. Following the introduction of the former in 2009, the PI withdrew from reviewing -and therefore submitting -research proposals to EPSRC, as explained in [4][5][6][7][8].…”

Section: Pathways To Impact Pathways and Publicsmentioning

confidence: 99%