Gunnar K. Pálsson

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Semiconductor heterostructures are the fundamental platform for many important device applications such as lasers, light-emitting diodes, solar cells, and high-electron-mobility transistors. Analogous to traditional heterostructures, layered transition metal dichalcogenide heterostructures can be designed and built by assembling individual single layers(More)
Dynamical mean field theory (DMFT) has been very successful in describing many aspects of strongly correlated electron systems [1], and presently much effort is being put into implementing it for realistic calculations of material properties of solids [2]. This method is exact in the limit of infinite lattice coordination [3] and describes correctly local(More)
A. Baldi,1,2,* G. K. Pálsson,3 M. Gonzalez-Silveira,1 H. Schreuders,2 M. Slaman,1,2 J. H. Rector,1 G. Krishnan,4 B. J. Kooi,4 G. S. Walker,5 M. W. Fay,6 B. Hjörvarsson,3 R. J. Wijngaarden,1 B. Dam,2 and R. Griessen1 1Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands 2Department of Chemical(More)
The diffusion rate of hydrogen in Nb was calculated using ab initio molecular dynamics simulations. At low temperatures the hydrogen is strongly trapped in a local strain field which is caused by the elastic response of the lattice. At elevated temperatures, the residence time (τ) of hydrogen in an interstitial site is not sufficient for fully developing(More)
Because of its light weight and small size, hydrogen exhibits one of the fastest diffusion rates in solid materials, comparable to the diffusion rate of liquid water molecules at room temperature. The diffusion rate is determined by an intricate combination of quantum effects and dynamic interplay with the displacement of host atoms that is still only(More)
The electric field control of functional properties is a crucial goal in oxide-based electronics. Nonvolatile switching between different resistivity or magnetic states in an oxide channel can be achieved through charge accumulation or depletion from an adjacent ferroelectric. However, the way in which charge distributes near the interface between the(More)
We investigate the effect of finite size on phase boundaries of hydride formation in ultrathin metallic films, using Fe/V(001) superlattices as a model system. The critical temperature is determined to scale linearly with the inverse thickness of the V layers. The decrease of the ordering temperature with decreasing layer thickness arises from the missing H(More)
The safe application of nanotechnology devices in biomedicine requires fundamental understanding on how they interact with and affect the different components of biological systems. In this respect, the cellular membrane, the cell envelope, certainly represents an important target or barrier for nanosystems. Here we report on the interaction between(More)