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On-surface synthesis of aromatic cyclo[10]carbon and cyclo[14]carbon
We provide a modified strategy for the on-surface synthesis of cyclocarbons with 10 or 14 carbon atoms that provides a route for characterizing annular carbon allotropes.
- Luye Sun
- , Wei Zheng
- & Wei Xu
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Article |
Adsorbate motors for unidirectional translation and transport
An adsorbate motor that moves unidirectionally on a copper surface is achieved by inducing intramolecular hydrogen transfer in a single molecule.
- Grant J. Simpson
- , Mats Persson
- & Leonhard Grill
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Article
| Open AccessTwo-dimensional ferroelectricity in a single-element bismuth monolayer
A single-element ferroelectric state is observed in a black phosphorus-like bismuth layer, in which the ordered charge transfer and the regular atom distortion between sublattices happen simultaneously and ferroelectric switching is further visualized experimentally.
- Jian Gou
- , Hua Bai
- & Andrew Thye Shen Wee
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Article |
The quantum twisting microscope
A quantum twisting microscope based on a unique van der Waals tip and capable of performing local interference experiments opens the way for new classes of experiments on quantum materials.
- A. Inbar
- , J. Birkbeck
- & S. Ilani
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Article |
Orbital-resolved visualization of single-molecule photocurrent channels
Atomic-level imaging of photocurrents in a single molecule is achieved by combining a tunable laser with scanning tunnelling microscopy, revealing how photons turn into electric current via a photoexcited molecule.
- Miyabi Imai-Imada
- , Hiroshi Imada
- & Yousoo Kim
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Article |
Spin splitting of dopant edge state in magnetic zigzag graphene nanoribbons
Decoupling spin-polarized edge states using substitutional N-atom dopants along the edges of a zigzag graphene nanoribbon (ZGNR) reveals giant spin splitting of a N-dopant edge state, and supports the predicted emergent magnetic order in ZGNRs.
- Raymond E. Blackwell
- , Fangzhou Zhao
- & Felix R. Fischer
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Article |
Observation of fractional edge excitations in nanographene spin chains
Using scanning tunnelling microscopy and spectroscopy, fractional edge excitations are observed in nanographene spin chains, enabling the potential to study strongly correlated phases in purely organic materials.
- Shantanu Mishra
- , Gonçalo Catarina
- & Roman Fasel
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Article |
Imaging two-dimensional generalized Wigner crystals
So far, only indirect evidence of Wigner crystals has been reported, but a specially designed scanning tunnelling microscope is used here to directly image them in a moiré heterostructure.
- Hongyuan Li
- , Shaowei Li
- & Feng Wang
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Article |
Direct assessment of the acidity of individual surface hydroxyls
Non-contact atomic force microscopy measurements are used to probe the hydrogen bond strength of individual surface hydroxyl groups and determine their acidity with atomic precision.
- Margareta Wagner
- , Bernd Meyer
- & Ulrike Diebold
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Article |
Sub-cycle atomic-scale forces coherently control a single-molecule switch
The near field of a terahertz wave confined to a scanning probe tip provides femtosecond atomic-scale forces that coherently modulate the switching probability of a molecule between two stable adsorption geometries.
- Dominik Peller
- , Lukas Z. Kastner
- & Jascha Repp
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Article |
Atomic imaging of the edge structure and growth of a two-dimensional hexagonal ice
Real-space imaging of the edge structures and growth of a two-dimensional ice on a gold substrate is achieved using noncontact atomic-force microscopy with a carbon monoxide tip.
- Runze Ma
- , Duanyun Cao
- & Ying Jiang
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Letter |
Selective triplet exciton formation in a single molecule
Recombination of excitons to produce molecular light emission is made more efficient by controlling electron spin within the molecule to produce spin-triplet excitons only, without the usual accompanying spin-singlet excitons.
- Kensuke Kimura
- , Kuniyuki Miwa
- & Yousoo Kim
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Letter |
Mapping orbital changes upon electron transfer with tunnelling microscopy on insulators
Driving single-electron tunnelling in synchronization with the oscillations of the conductive tip of an atomic force microscope allows mapping of the electronic structure of individual molecules in different charge states.
- Laerte L. Patera
- , Fabian Queck
- & Jascha Repp
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Letter |
A standing molecule as a single-electron field emitter
Precision control over matter at the atomic scale enables a planar dye molecule to be lifted up and placed on its edge—a configuration that is surprisingly stable.
- Taner Esat
- , Niklas Friedrich
- & Ruslan Temirov
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Letter |
The effect of hydration number on the interfacial transport of sodium ions
A sodium ion hydrated with three (rather than one, two, four or five) water molecules diffuses orders of magnitude more quickly than the other ion hydrates owing to the interfacial symmetry mismatch.
- Jinbo Peng
- , Duanyun Cao
- & Ying Jiang
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Letter |
Direct instrumental identification of catalytically active surface sites
Scanning tunnelling microscopy is used to distinguish between different active sites of a catalyst—such as boundaries between different materials—during a reaction, allowing the contributions of these sites to be evaluated.
- Jonas H. K. Pfisterer
- , Yunchang Liang
- & Aliaksandr S. Bandarenka
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Letter |
Tracking the ultrafast motion of a single molecule by femtosecond orbital imaging
Watching a single molecule move calls for measurements that combine ultrafast temporal resolution with atomic spatial resolution; this is now shown to be possible by combining scanning tunnelling microscopy with lightwave electronics, through a technique that involves removing a single electron from the highest occupied orbital of a single pentacene molecule in a time window shorter than an oscillation cycle of light.
- Tyler L. Cocker
- , Dominik Peller
- & Rupert Huber
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Letter |
Visualizing coherent intermolecular dipole–dipole coupling in real space
Luminescence induced by highly localized excitations that are produced by electrons tunnelling from the tip of a scanning tunnelling microscope is used to map the spatial distribution of the excitonic coupling in well-defined arrangements of a few zinc-phthalocyanine molecules and the dependence of this spatial distribution on the relative orientation and phase of the transition dipoles of the individual molecules.
- Yang Zhang
- , Yang Luo
- & J. G. Hou
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Letter |
Electrostatic catalysis of a Diels–Alder reaction
Theory suggests that many chemical reactions (not simply, as is often thought, redox reactions) might be catalysed by an applied electric field; experimental evidence for this is now provided from single-molecule studies of the formation of carbon–carbon bonds in a Diels–Alder reaction.
- Albert C. Aragonès
- , Naomi L. Haworth
- & Michelle L. Coote
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Letter |
Self-assembly of hydrogen-bonded two-dimensional quasicrystals
Scanning tunnelling microscopy reveals that molecules of ferrocenecarboxylic acid can self-assemble into quasicrystal monolayers containing highly unusual cyclic hydrogen-bonded pentamers; this molecular framework could form the basis of a large range of supramolecular assemblies.
- Natalie A. Wasio
- , Rebecca C. Quardokus
- & S. Alex Kandel
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Letter |
Heat dissipation in atomic-scale junctions
An innovative technique based on scanning tunnelling probes with integrated thermocouples is developed and used to measure heat dissipation in the electrodes of atomic and molecular junctions.
- Woochul Lee
- , Kyeongtae Kim
- & Pramod Reddy
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News & Views |
Gold's enigmatic surface
Gold is not as inert as was believed — it can promote molecular synthesis. A study uses scanning tunnelling microscopy to catch gold in the act as it guides the formation of one-dimensional polymers from saturated hydrocarbons.
- Robert J. Madix
- & Cynthia M. Friend
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News & Views |
Microscopy of the macroscopic
The presence of magnetic moments in materials known as Kondo lattices can lead to an exotic transformation in their properties. The first successful endeavour into imaging such a transformation has now been made. See Letter p.362
- Piers Coleman
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Research Highlights |
Optical physics: A peek at a molecule's guts
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News & Views |
How the cuprates hid their stripes
Extensive mapping of local electronic structure in copper oxide superconductors reveals fluctuating stripe-like electron patterns that appear as a high-temperature precursor to superconductivity. See Letter p.677
- Kathryn A. Moler
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Letter |
Fluctuating stripes at the onset of the pseudogap in the high-Tc superconductor Bi2Sr2CaCu2O8+x
A long-standing question has been the interplay between pseudogap, which is generic to all hole doped copper oxide superconductors, and stripes, whose static form occurs in only one family of copper oxides over a narrow range of the phase diagram. This study reports observations of the spatial reorganization of electronic states with the onset of the pseudogap state at T* in the high temperature superconductor Bi2Sr2CaCu2O8+x using scanning tunnelling microscopy. The onset of the pseudogap phase coincides with the appearance of electronic patterns that have the predicted characteristics of fluctuating stripes. The experiments indicate that stripes are a consequence of pseudogap behaviour rather than its cause.
- Colin V. Parker
- , Pegor Aynajian
- & Ali Yazdani
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Letter |
Nanoscale scanning probe ferromagnetic resonance imaging using localized modes
Advances in nanomagnetics research have brought powerful applications in magnetic sensing technology, but so far no high-resolution magnetic-imaging tool is available to characterize complex, often buried, nanoscale structures. These authors have developed a scanning probe technique in which the intense, confined magnetic field of a micromagnetic probe tip is used to localize the ferromagnetic resonance mode immediately beneath the probe, and demonstrate that they can image magnetic features at a resolution of 200 nm.
- Inhee Lee
- , Yuri Obukhov
- & P. Chris Hammel