2015
DOI: 10.1103/physrevlett.114.146101
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Force Field Analysis Suggests a Lowering of Diffusion Barriers in Atomic Manipulation Due to Presence of STM Tip

Abstract: We study the physics of atomic manipulation of CO on a Cu(111) surface by combined scanning tunneling microscopy and atomic force microscopy at liquid helium temperatures. In atomic manipulation, an adsorbed atom or molecule is arranged on the surface using the interaction of the adsorbate with substrate and tip. While previous experiments are consistent with a linear superposition model of tip and substrate forces, we find that the force threshold depends on the force field of the tip. Here, we use carbon mon… Show more

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Cited by 39 publications
(37 citation statements)
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References 41 publications
(53 reference statements)
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“…Next, another sharp change in the conductances occurs, while ∂ G (x) /∂x < 0, and afterwards the adatoms are imaged in their new lateral positions (see blue section 2 for monoatomic metal tip and orange section 2 for CO tip, respectively). Hence, the adatoms are laterally manipulated, after the tip has passed the center of the iron 30,38 . The scale bars in panels (a) and (b) correspond to 300 pm.…”
Section: (B)mentioning
confidence: 99%
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“…Next, another sharp change in the conductances occurs, while ∂ G (x) /∂x < 0, and afterwards the adatoms are imaged in their new lateral positions (see blue section 2 for monoatomic metal tip and orange section 2 for CO tip, respectively). Hence, the adatoms are laterally manipulated, after the tip has passed the center of the iron 30,38 . The scale bars in panels (a) and (b) correspond to 300 pm.…”
Section: (B)mentioning
confidence: 99%
“…Figure 3(a) shows the COFI image (∆f (x, y)) of the monoatomic metal tip. The image reveals a tilt of the tip whose direction can be determined by investigating the bright sickle in the top part of the image 30,38 . This sickle is present because the tilted part of the tip at these (x, y)-positions is closer to the CO molecule and the interaction is already in the repulsive regime compared to the positions mirrored at the center of the CO molecule.…”
Section: (B)mentioning
confidence: 99%
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“…Throughout the whole paper, the IET signal is normalized by the differential conductance, i.e., IETS = (d 2 I/dV 2 )/(dI/dV ) [10,14,18,20]. The tip is formed from an etched tungsten wire, cleaned by field evaporation and repeatedly poked into the Cu substrate to prepare various tip apexes [23,24,30]. The repeated poking processes probably cover the tip apex with Cu atoms.…”
mentioning
confidence: 99%
“…In addition to images of atomic arrangements, detailed measurements can be made of molecular orbitals [1,2], electronic structure, vibrational [3] and magnetic excitations [4]. With atomic force microscoscopy (AFM), the interaction between tip and sample is characterized, which allows for examination of the tip-apex structure [5][6][7][8]. The tip-apex structure may strongly influence the tunneling process, both when making a quantitative comparison between experimental and theoretical STM images [9], and when investigating the inelastic tunneling signal from an adsorbate species [10].…”
Section: Introductionmentioning
confidence: 99%