Recent Publications

02/2017

S. Omar, M. H. D. Guimaraes, A. Kaverzin, B. J. van Wees, I. J. Vera-Marun  
Spin relaxation 1/f noise in graphene 

Physical Review B 95, 081403(R) (2017) URL

02/2017

A. Aqeel, I. J. Vera-Marun, Z. Salman, T. Prokscha, A. Suter, B. J. van Wees, T. T. M. Palstra  
Probing current-induced magnetic fields in Au|YIG heterostructure with low-energy muon spectroscopy 

Applied Physics Letters 110, 062409 (2017) URL

01/2017

T. Kosub, M. Kopte, R. Hühne, P. Appel, B. Shields, P. Maletinsky, R. Hübner, M. O. Liedke, J. Fassbender, O. G. Schmidt, D. Makarov   
Purely antiferromagnetic magnetoelectric random access memory 

Nature Communications 8, 13985 (2017) URL

12/2016

F. Kirtschig, J. van den Brink, C. Ortix  
Surface-state spin textures in strained bulk HgTe: strain-induced topological phase transitions  

Physical Review B 94, 235437 (2016) URL

MORE PUBLICATIONS

Curved Nanomembranes for Topological Quantum Computation

Majorana fermions - particles that are their own antiparticles - are at the heart of topological quantum computation. In condensed matter they can be built out of what nature offers us: electron and hole excitations.

Recently a number of experimental setups have been proposed to support Majorana modes. Although these solid-state-devices consist of rather "conventional" building blocks, the actual experimental observation of Majorana fermions is still the biggest challenge in the field. The experimental difficulty stems from a delicate fine-tuning of intrinsic materials properties and external quantities.

The aim of the EU FP7-ICT FET Young Explorers collaborative project CNTQC is to overcome these hurdles by designing novel platforms based on compact three-dimensional curved nanoarchitectures in which the requirements of the Majorana fermion's cocktail can be generated in a controlled manner.

01/2017Random Access Memory on a low energy diet  

Memory chips are among the most basic components in computers. The random access memory is where processors temporarily store their data. We demonstrate a first-of-its-kind room-temperature memory element that is based purely on antiferromagnetic magnetoelectric random access memory, and can be written by using an electric field instead of a current. This writing method dissipated no energy in the electrical resistance of the memory cell. At the same time, we show that the data can be read-out all-electrically even though the antiferromagnet is an electrical insulator. Read more ...  

11/2016New publication in 2D Materials 

We have put forward a new explanation for the generic presence of one-dimensional edge channels in two-dimensional materials. In a paper published in 2D Materials, we link the occurrence of these states in 2D insulators, such as phosphorene, and zero-gap semiconductors, graphene being the primary example, to a new topological quantity. These findings can be tested with local-probe experiments. Read more ...  

 

08/2016Our review paper is highlighted in JPhys+ 

Our review paper "Magnetism in curved geometries" was highlighted by the reviewers as being particularly significant to the community. The paper is featured in a blog post at JPhys+. The text of the highlight can be read here

08/2016New publication in Physical Review B Rapid Comm. 

The manipulation and control of the electron spin set fundamental challenges for the development of innovative solutions in quantum engineering. In our report, we uncover a fundamental entanglement between the electron spin degree of freedom and the geometry of the system in which the electrons reside. Taking the example of an elliptically deformed quantum ring with Rashba spin-orbit, we provide a proof-of-principle of an all-geometrical-and-electrical control of electron spin and quantum spin transport. Read more ... 

 

05/2016New publication in Nature Communications

The interaction of electric and thermal transport phenomena leads to the Seeback and Peltier thermoelectric effects. Here, we directly detect the Peltier effect in single and bilayer graphene, and show that it can be switched from heating to cooling by tuning the type and density of the charge carriers using a back gate. Read more ... 

 

12/2015New publication in Physical Review Letters

We prove that curvature effects in low-dimensional nanomaterials can promote the generation of topological states of matter by considering the paradigmatic example of quantum wires with Rashba spin-orbit coupling, which are bent in a nanoscale periodic serpentine structure. Our results suggest that the local curvature and the topology of the electronic states are inextricably intertwined in geometrically deformed nanomaterials. Read more ...  

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The project CNTQC acknowledges the financial support of the Future and Emerging Technologies (FET) programme within the
Seventh Framework Programme for Research of the European Commission, under FET-Open grant number: 618083.