Engineering Negative Differential Conductance with the Cu(111) Surface State

Heinrich, Benjamin; Rastei, M. V.; Choi, Deung-Jang; Frederiksen, Thomas; Limot, L.

doi:10.1103/physrevlett.107.246801

Cited by 31 publications

(35 citation statements)

References 24 publications

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“…The proposed mechanism deviates from common NDR concepts, in which a discrete electronic state, e.g. a molecular orbital, turns non-resonant with the Fermi energy in either tip or sample [2][3][4][5][6]. Indirect support for our interpretation comes from the fact that no comparable conductance behaviour has been observed for the various particle-oxide systems explored with STM so far [39].…”

Section: Discussioncontrasting

confidence: 67%

“…The NDR effect has been identified in a large variety of quantum systems. It is commonly found in the electron transport through individual molecules and molecular films [3][4][5][6], and arises if a conductance channel through a molecular orbital becomes non-resonant with the leads of the junction [7,8]. Alternatively, the NDR effect may be triggered by conformational changes in the molecules, which modify the transparency of the molecular DOS for electrons [9].…”

Section: Introductionmentioning

confidence: 99%

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Negative differential conductance in the electron-transport through copper-rich cuprous oxide thin films

2019

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Copper deposition onto Cu 2 O thin films grown on Au(111) results in the formation of monolayer islands with hexagonal and rhombic shapes, as observed with scanning tunnelling microscopy. The differential conductance through the Cu islands is governed by distinct quantum well states (QWS), accompanied by pronounced electron standing wave patterns. Below the onset of the QWS, an extended region of negative differential conductance opens up, in which also the tunnelling current declines markedly with increasing bias voltage. The effect is assigned to the quantised electronic structure of the Cu islands in combination with the p-type conductance behaviour of the oxide film underneath. The latter promotes electron transport across the islands around the Fermi level, but leads to a closure of this transport channel at negative bias.

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Section: Discussioncontrasting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Negative differential conductance in the electron-transport through copper-rich cuprous oxide thin films

2019

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“…Next, to validate our imaging technique, we carry out a comparative study between standard dI/dV maps and iso-dI/dV maps by focusing our attention onto isolated C 60 molecules on Cu(111). In the inset of figure 2(a) we present a standard STM image of a C 60 where the characteristic threefold-symmetric shape of the molecule can be recognized, indicating that it is adsorbed with a hexagon oriented towards the tip [30][31][32]. The dI/dV spectra (figure 2(a)) acquired for different positions of the STM tip (dots in the STM image) reveal a variety of molecular resonances.…”

Section: Resultsmentioning

confidence: 99%

Imaging isodensity contours of molecular states with STM

et al. 2017

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Spatially resolved conductance of oriented C60 G Schull, N Néel, M Becker et al. AbstractWe present an improved way for imaging the density of states of a sample with a scanning tunneling microscope, which consists in mapping the surface topography while keeping the differential conductance (dI/dV ) constant. When archetypical C 60 molecules on Cu(111) are imaged with this method, these so-called iso-dI/dV maps are in excellent agreement with theoretical simulations of the isodensity contours of the molecular orbitals. A direct visualization and unambiguous identification of superatomic C 60 orbitals and their hybridization is then possible.

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“…1a, exhibits now a molecular pattern which corresponds to a reverse image of the apex. [36][37][38] The ring-shape tip apex corresponds to a Cp ring of a tilted Fc molecule. 39 Placing this molecular tip on top of the Co atom and proceeding the same way, i. e., decreasing the tip-sample distance until a certain threshold value, we are able to release the molecule from the tip.…”

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confidence: 99%

On-Surface Engineering of a Magnetic Organometallic Nanowire

et al. 2015

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The manipulation of the molecular spin state by atom doping is an attractive strategy to confer desirable magnetic properties to molecules. Here, we present the formation of novel magnetic metallocenes by following this approach. In particular, two different on-surface procedures to build isolated and layer-integrated Co-ferrocene (CoFc) molecules on a metallic substrate via atomic manipulation and atom deposition are shown. The structure as well as the electronic properties of the so-formed molecule are investigated combining scanning tunneling microscopy and spectroscopy with density functional theory calculations. It is found that unlike single ferrocene a CoFc molecule possesses a magnetic moment as revealed by the Kondo effect. These results correspond to the first controlled procedure toward the development of tailored metallocene-based nanowires with a desired chemical composition, which are predicted to be promising materials for molecular spintronics.

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Engineering Negative Differential Conductance with the Cu(111) Surface State

Cited by 31 publications

References 24 publications

Negative differential conductance in the electron-transport through copper-rich cuprous oxide thin films

Negative differential conductance in the electron-transport through copper-rich cuprous oxide thin films

Imaging isodensity contours of molecular states with STM

On-Surface Engineering of a Magnetic Organometallic Nanowire

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