Maciej.bazarnik

Author(s): Heekeun Shin, A. Schwarze, R. D. Diehl, K. Pussi, A. Colombier, É. Gaudry, J. Ledieu, G. M. McGuirk, L. N. Serkovic Loli, V. Fournée, L. L. Wang, G. Schull, and R. Berndt

Earlier studies of C60 adsorption on Au(111) reported many interesting and complex features. We have performed coordinated low-energy electron diffraction, scanning tunneling microscopy (STM), and density functional theory studies to elucidate some of the details of the monolayer commensurate (2√3 ×...

[Phys. Rev. B 89, 245428] Published Thu Jun 19, 2014

Author(s): M. Neu, N. Moll, L. Gross, G. Meyer, F. J. Giessibl, and J. Repp

It has been demonstrated that atomic force microscopy imaging with CO-functionalized tips provides unprecedented resolution, yet it is subject to strong image distortions. Here we propose a method to correct for these distortions. The lateral force acting on the tip apex is calculated from three-dim...

[Phys. Rev. B 89, 205407] Published Wed May 07, 2014

Article

It is difficult to spatially resolve molecular orbitals of molecules on highly reactive semiconductor surfaces. Here, Xu et al. use scanning tunnelling microscopy to study pyridazine molecules on a clean germanium surface, and hybridized molecular orbitals are directly imaged.

Nature Communications doi: 10.1038/ncomms4721

Authors: Jing Hui He, Wei Mao, Guo Qin Xu, Eng Soon Tok

Author(s): Wen-Yu He, Ying Su, Mudan Yang, and Lin He

It is well established that some kinds of lattice deformations in graphene monolayer, which change electron hopping in the sublattice and affect in-plane motion of electrons, may induce out-of-plane pseudomagnetic fields as large as 100 T. Here, we demonstrate that stacking misorientation in graphen...

[Phys. Rev. B 89, 125418] Published Fri Mar 14, 2014

Abstract

Author(s): Deniz Çakır, Diana M. Otálvaro, and Geert Brocks

We calculate the spin-polarized electronic transport through a molecular bilayer spin valve from first principles, and establish the link between the magnetoresistance and the spin-dependent interactions at the metal-molecule interfaces. The magnetoresistance of a Fe|bilayer-C70|Fe spin valve attain...

[Phys. Rev. B 89, 115407] Published Mon Mar 10, 2014

Author(s): R. Seoane Souto, A. Levy Yeyati, A. Martín-Rodero, and R. C. Monreal

A theoretical approach for the nonequilibrium transport properties of nanoscale systems coupled to metallic electrodes with strong electron-phonon interactions is presented. It consists of a resummation of the dominant Feynman diagrams from the perturbative expansion in the coupling to the leads. We...

[Phys. Rev. B 89, 085412] Published Fri Feb 14, 2014

Author(s): A. Garcia-Lekue, T. Balashov, M. Olle, G. Ceballos, A. Arnau, P. Gambardella, D. Sanchez-Portal, and A. Mugarza

We investigate the scattering of surface electrons by the edges of graphene islands grown on Ni(111). By combining local tunneling spectroscopy and ab initio electronic structure calculations we find that the hybridization between graphene and Ni states results in strongly reflecting graphene edges....

[Phys. Rev. Lett. 112, 066802] Published Fri Feb 14, 2014

Abstract

Article

The motion of ferroelectric domain walls is critical in determining the response of ferroelectrics to an applied stimulus. Here, the authors directly measure the effect of an additional non-motional or stationary domain wall contribution to dielectric susceptibility in nanodomain ferroelectric films.

Nature Communications doi: 10.1038/ncomms4120

Authors: Ruijuan Xu, J. Karthik, Anoop R. Damodaran, Lane W. Martin

Face-to-face transfer of wafer-scale graphene films

Nature 505, 7482 (2014). doi:10.1038/nature12763

Authors: Libo Gao, Guang-Xin Ni, Yanpeng Liu, Bo Liu, Antonio H. Castro Neto & Kian Ping Loh

Graphene has attracted worldwide interest since its experimental discovery, but the preparation of large-area, continuous graphene film on SiO2/Si wafers, free from growth-related morphological defects or transfer-induced cracks and folds, remains a formidable challenge. Growth of graphene by chemical vapour deposition on Cu foils has emerged as a powerful technique owing to its compatibility with industrial-scale roll-to-roll technology. However, the polycrystalline nature and microscopic roughness of Cu foils means that such roll-to-roll transferred films are not devoid of cracks and folds. High-fidelity transfer or direct growth of high-quality graphene films on arbitrary substrates is needed to enable wide-ranging applications in photonics or electronics, which include devices such as optoelectronic modulators, transistors, on-chip biosensors and tunnelling barriers. The direct growth of graphene film on an insulating substrate, such as a SiO2/Si wafer, would be useful for this purpose, but current research efforts remain grounded at the proof-of-concept stage, where only discontinuous, nanometre-sized islands can be obtained. Here we develop a face-to-face transfer method for wafer-scale graphene films that is so far the only known way to accomplish both the growth and transfer steps on one wafer. This spontaneous transfer method relies on nascent gas bubbles and capillary bridges between the graphene film and the underlying substrate during etching of the metal catalyst, which is analogous to the method used by tree frogs to remain attached to submerged leaves. In contrast to the previous wet or dry transfer results, the face-to-face transfer does not have to be done by hand and is compatible with any size and shape of substrate; this approach also enjoys the benefit of a much reduced density of transfer defects compared with the conventional transfer method. Most importantly, the direct growth and spontaneous attachment of graphene on the underlying substrate is amenable to batch processing in a semiconductor production line, and thus will speed up the technological application of graphene.

Nature Physics 10, 21 (2014). doi:10.1038/nphys2814

Authors: Fazhan Shi, Xi Kong, Pengfei Wang, Fei Kong, Nan Zhao, Ren-Bao Liu & Jiangfeng Du

Single-molecule nuclear magnetic resonance is a current challenge in the field of magnetic resonance spectroscopy and has important applications in chemical analysis and quantum computing. Through decoherence measurements of nitrogen–vacancy centres under dynamical decoupling control, the sensing of a single 13C nuclear spin at nanometre distance has recently been realized. A further step towards the ultimate goal of structure analysis of single molecules would be the direct measurement of the interactions within single nuclear-spin clusters. Here we sense a single 13C–13C nuclear-spin dimer located about 1 nm from the nitrogen–vacancy centre and characterize the interaction (∼690 Hz) between the two nuclear spins. From the measured interaction we derive the spatial configuration of the dimer with atomic-scale resolution. These results indicate that, in combination with advanced material-surface engineering, central spin decoherence under dynamical decoupling control may be a useful probe for nuclear magnetic resonance single-molecule structure analysis.

Article

The intercalation of graphene can result in many attractive functional properties. Here, the authors study the mechanism of caesium intercalation of graphene, finding that it nucleates at wrinkles on the graphene surface and is influenced by van der Waals interactions.

Nature Communications doi: 10.1038/ncomms3772

Authors: M. Petrović, I. Šrut Rakić, S. Runte, C. Busse, J. T. Sadowski, P. Lazić, I. Pletikosić, Z.-H. Pan, M. Milun, P. Pervan, N. Atodiresei, R. Brako, D. Šokčević, T. Valla, T. Michely, M. Kralj