114 citations · 371 across the 11 of their papers we have counts for
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Dominant source of disorder in graphene: Charged impurities or ripples?
Zheyong Fan, Andreas Uppstu, Ari Harju
Experimentally produced graphene sheets exhibit a wide range of mobility values. Both extrinsic charged impurities and intrinsic ripples (corrugations) have been suggested to induc…
Silicon and silicon-nitrogen impurities in graphene: structure, energetics and effects on electronic transport
Mikko M. Ervasti, Zheyong Fan, Andreas Uppstu +2
We theoretically study the atomic structure and energetics of silicon and silicon-nitrogen impurities in graphene. Using density-functional theory, we get insight into the atomic s…
Electronic and transport properties in geometrically disordered graphene antidot lattices
Zheyong Fan, Andreas Uppstu, Ari Harju
A graphene antidot lattice, created by a regular perforation of a graphene sheet, can exhibit a considerable band gap required by many electronics devices. However, deviations from…
Anderson localization in two-dimensional graphene with short-range disorder: One-parameter scaling and finite-size effects
Zheyong Fan, Andreas Uppstu, Ari Harju
We study Anderson localization in graphene with short-range disorder using the real-space Kubo-Greenwood method implemented on graphics processing units. Two models of short-range…
Obtaining localization properties efficiently using the Kubo-Greenwood formalism
Andreas Uppstu, Zheyong Fan, Ari Harju
We establish, through numerical calculations and comparisons with a recursive Green's function based implementation of the Landauer-Büttiker formalism, an efficient method for stud…
Efficient linear-scaling quantum transport calculations on graphics processing units and applications on electron transport in graphene
Zheyong Fan, Andreas Uppstu, Topi Siro +1
We implement, optimize, and validate the linear-scaling Kubo-Greenwood quantum transport simulation on graphics processing units by examining resonant scattering in graphene. We co…
Single- and multi-mode Fabry-Pérot interference in suspended graphene
Mika Oksanen, Andreas Uppstu, Antti Laitinen +5
Phase coherence of charge carriers leads to electron-wave interference in ballistic mesoscopic conductors. In graphene, such Fabry-Pérot-like interference has been observed, but a…
Ab-initio transport fingerprints for resonant scattering in graphene
Karri Saloriutta, Andreas Uppstu, Ari Harju +1
We have recently shown that by using a scaling approach for randomly distributed topological defects in graphene, reliable estimates for transmission properties of macroscopic samp…
High-field magnetoresistance revealing scattering mechanisms in graphene
Andreas Uppstu, Ari Harju
We show that the type of charge carrier scattering significantly affects the high-field magnetoresistance of graphene nanoribbons. This effect has potential to be used in identifyi…
Electronic transport in graphene-based structures: an effective cross section approach
Andreas Uppstu, Karri Saloriutta, Ari Harju +2
We show that transport in low-dimensional carbon structures with finite concentrations of scatterers can be modeled by utilising scaling theory and effective cross sections. Our re…
Quantum confined electronic states in atomically well-defined graphene nanostructures
Sampsa Hämäläinen, Zhixiang Sun, Mark P. Boneschanscher +5
Despite the enormous interest in the properties of graphene and the potential of graphene nanostructures in electronic applications, the study of quantum confined states in atomica…