Mikel Abadia

Author(s): C. Hogan, O. Pulci, P. Gori, F. Bechstedt, D. S. Martin, E. E. Barritt, A. Curcella, G. Prevot, and Y. Borensztein

Silver is a popular choice of substrate for the growth of nanostructured 1D and 2D silicon – possibly silicenelike – layers. First-principles simulations and measurements of reflectance anisotropy and surface differential reflectivity spectroscopy are applied to the study of single monolayer Si/Ag(111) and Si/Ag(110) interfaces. The authors demonstrate the absence of structural and electronic properties of freestanding, graphenelike silicene, finding evidence for strong Si-Ag bonding in the Si/Ag(111) case and the formation of pentagonal nanoribbons on Si/Ag(110). Many-body effects in the optical response of silicene are found to cancel out.

[Phys. Rev. B 97, 195407] Published Mon May 07, 2018

Author(s): Ch. Zaum, K. M. Meyer-auf-der-Heide, and K. Morgenstern

We follow the diffusion of CO molecules on Cu(111) by time-lapsed low-temperature scanning tunneling microscopy. The diffusivity of individual CO molecules oscillates with the distance to its nearest neighbor due to the long-range interaction mediated by the surface state electrons. The markedly dif...

[Phys. Rev. B 97, 155437] Published Mon Apr 30, 2018

Author(s): Sebastian E. Reyes-Lillo, Tonatiuh Rangel, Fabien Bruneval, and Jeffrey B. Neaton

The Ruddlesden-Popper (RP) homologous series Srn+1TinO3n+1 provides a useful template for the study and control of the effects of dimensionality and quantum confinement on the excited state properties of the complex oxide SrTiO3. We use ab initio many-body perturbation theory within the GW approxima…

[Phys. Rev. B 94, 041107(R)] Published Fri Jul 08, 2016

Author(s): Lishu Liu, Zengxia Mei, Aihua Tang, Alexander Azarov, Andrej Kuznetsov, Qi-Kun Xue, and Xiaolong Du

Oxygen vacancy (VO) is a common native point defect that plays crucial roles in determining the physical and chemical properties of metal oxides such as ZnO. However, fundamental understanding of VO is still very sparse. Specifically, whether VO is mainly responsible for the n-type conductivity in Z…

[Phys. Rev. B 93, 235305] Published Wed Jun 15, 2016

Author(s): Yuanjun Zhou and Andrew J. Millis

Monolayer films of FeSe grown on SrTiO3 substrates are electron doped relative to bulk and exhibit a significantly higher superconducting transition temperature. An interaction of electrons in the FeSe layer with SrTiO3 phonons has been suggested. We present density functional calculations and a mod…

[Phys. Rev. B 93, 224506] Published Mon Jun 06, 2016

Author(s): Jun-Yi Ge, Vladimir N. Gladilin, Cun Xue, Jacques Tempere, Jozef T. Devreese, Joris Van de Vondel, Youhe Zhou, and Victor V. Moshchalkov

In a magnetic field, superconductivity is manifested by total magnetic field expulsion (Meissner effect) or by the penetration of integer multiples of the flux quantum Φ0. Here we present experimental results revealing magnetic dipoles formed by Meissner current flowing around artificially introduce…

[Phys. Rev. B 93, 224502] Published Thu Jun 02, 2016

Nature Chemistry 8, 597 (2016). doi:10.1038/nchem.2505

Authors: Christopher R. Ryder, Joshua D. Wood, Spencer A. Wells, Yang Yang, Deep Jariwala, Tobin J. Marks, George C. Schatz & Mark C. Hersam

Few-layer black phosphorus (BP) is a promising semiconductor, but it is highly reactive and susceptible to ambient degradation. Covalent functionalization with aryl radicals has now been shown to significantly improve the stability of exfoliated BP, as well as the performance of BP-based electronic devices through a controllable p-type doping effect.

Author(s): K. Fukutani, T. Sato, P. V. Galiy, K. Sugawara, and T. Takahashi

We report the discovery of two-dimensional electron gas (2DEG) at the surface of thermoelectric material In4Se3 by angle-resolved photoemission spectroscopy. The observed 2DEG exhibits a nearly isotropic band dispersion with a considerably small effective mass of m*=0.16 m0, and its carrier density …

[Phys. Rev. B 93, 205156] Published Tue May 31, 2016

Author(s): Jens Baringhaus, Mikkel Settnes, Johannes Aprojanz, Stephen R. Power, Antti-Pekka Jauho, and Christoph Tegenkamp

We realize nanometer size constrictions in ballistic graphene nanoribbons grown on sidewalls of SiC mesa structures. The high quality of our devices allows the observation of a number of electronic quantum interference phenomena. The transmissions of Fabry-Perot-like resonances are probed by in situ…

[Phys. Rev. Lett. 116, 186602] Published Thu May 05, 2016