Maciej.bazarnik

Author(s): Maedeh Zahedifar and Peter Kratzer

Density functional theory calculations for the electronic and phononic band structures of Pb/Si(111) thin films with a thickness of 4 and 5 monolayers (ML) are performed. We employ a Si(111)(3×3) unit cell to model the Pb films including the Si substrate, and identify quantum well (QW) states for fi...

[Phys. Rev. B 96, 115442] Published Mon Sep 25, 2017

Author(s): Sara Fiori, Yuya Murata, Stefano Veronesi, Antonio Rossi, Camilla Coletti, and Stefan Heun

We present a systematical study via scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) on the effect of the exposure of lithium on graphene on silicon carbide (SiC). We have investigated Li deposition both on epitaxial monolayer graphene and on buffer layer surfaces on th...

[Phys. Rev. B 96, 125429] Published Wed Sep 20, 2017

Author(s): Wen-Xiao Wang, Hua Jiang, Yu Zhang, Si-Yu Li, Haiwen Liu, Xinqi Li, Xiaosong Wu, and Lin He

Finite-size twisted bilayer graphene (TBG, where here the TBG is of nanoscale size) is quite unstable and will change its structure to a Bernal (or AB-stacking) bilayer with a much lower energy. Therefore, the lack of finite-size TBG makes its electronic properties difficult to access in experiments...

[Phys. Rev. B 96, 115434] Published Tue Sep 19, 2017

Abstract

Abstract

Nature Materials 16, 887 (2017). doi:10.1038/nmat4931

Authors: Jieun Lee, Zefang Wang, Hongchao Xie, Kin Fai Mak & Jie Shan

The magnetoelectric (ME) effect, the phenomenon of inducing magnetization by application of an electric field or vice versa, holds great promise for magnetic sensing and switching applications. Studies of the ME effect have so far focused on the control of the electron spin degree of freedom (DOF) in materials such as multiferroics and conventional semiconductors. Here, we report a new form of the ME effect based on the valley DOF in two-dimensional Dirac materials. By breaking the three-fold rotational symmetry in single-layer MoS 2 via a uniaxial stress, we have demonstrated the pure electrical generation of valley magnetization in this material, and its direct imaging by Kerr rotation microscopy. The observed out-of-plane magnetization is independent of in-plane magnetic field, linearly proportional to the in-plane current density, and optimized when the current is orthogonal to the strain-induced piezoelectric field. These results are fully consistent with a theoretical model of valley magnetoelectricity driven by Berry curvature effects. Furthermore, the effect persists at room temperature, opening possibilities for practical valleytronic devices.

Nature Chemistry 9, 909 (2017). doi:10.1038/nchem.2744

Authors: Robert E. Thompson, Xuyu Liu, Jorge Ripoll-Rozada, Noelia Alonso-García, Benjamin L. Parker, Pedro José Barbosa Pereira & Richard J. Payne

Tyrosine sulfation strongly enhances the inhibition of thrombin by the tick-derived anticoagulants madanin-1 and chimadanin. Protein chemical synthesis and structural studies have revealed a mode of inhibition that is unprecedented among cysteine-free anticoagulant proteins. This inhibition occurs through the recognition of the highly basic exosite II of thrombin.

Author(s): Torben Jasper-Tönnies, Aran Garcia-Lekue, Thomas Frederiksen, Sandra Ulrich, Rainer Herges, and Richard Berndt

The conductance of a molecule standing perpendicular to a substrate is found to be dependent on the geometry, orbital symmetries, and bonds of the molecule.

[Phys. Rev. Lett. 119, 066801] Published Mon Aug 07, 2017