Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Jansson, Ville"'
Although atomic diffusion on metal surfaces under high electric fields has been studied theoretically and experimentally since the 1970s, its accurate and quantitative theoretical description remains a significant challenge. In our previous work, we
Externí odkaz:
http://arxiv.org/abs/2201.03460
Autor:
Jansson, Ville, Baibuz, Ekaterina, Kyritsakis, Andreas, Vigonski, Simon, Zadin, Vahur, Parviainen, Stefan, Aabloo, Alvo, Djurabekova, Flyura
Publikováno v:
Nanotechnology 31 355301 (2020)
In this work we show using atomistic simulations that the biased diffusion in high electric field gradients creates a mechanism whereby nanotips may start growing from small surface asperities. It has long been known that atoms on a metallic surface
Externí odkaz:
http://arxiv.org/abs/1909.05825
Autor:
Jansson, Ville, Kyritsakis, Andreas, Vigonski, Simon, Baibuz, Ekaterina, Zadin, Vahur, Aabloo, Alvo, Djurabekova, Flyura
Publikováno v:
Modelling Simul. Mater. Sci. Eng. 28 035011 (2020)
We have calculated the migration barriers for surface diffusion on Tungsten. Our results form a self-sufficient parameterization for Kinetic Monte Carlo simulations of arbitrarily rough atomic tungsten surfaces, as well as nanostructures such as nano
Externí odkaz:
http://arxiv.org/abs/1909.03519
Publikováno v:
Phys. Rev. B 99, 205418 (2019)
Combining classical electrodynamics and density functional theory (DFT) calculations, we develop a general and rigorous theoretical framework that describes the energetics of metal surfaces under high electric fields. We show that the behavior of a s
Externí odkaz:
http://arxiv.org/abs/1808.07782
Autor:
Kimari, Jyri, Jansson, Ville, Vigonski, Simon, Baibuz, Ekaterina, Domingos, Roberto, Zadin, Vahur, Djurabekova, Flyura
Publikováno v:
Data in Brief 32, 106094 (2020)
Kinetic Monte Carlo (KMC) is an efficient method for studying diffusion. A limiting factor to the accuracy of KMC is the number of different migration events allowed in the simulation. Each event requires its own migration energy barrier. The calcula
Externí odkaz:
http://arxiv.org/abs/1806.03062
Autor:
Kimari, Jyri, Jansson, Ville, Vigonski, Simon, Baibuz, Ekaterina, Domingos, Roberto, Zadin, Vahur, Djurabekova, Flyura
Publikováno v:
Computational Materials Science 183, 109789 (2020)
Kinetic Monte Carlo (KMC) is a powerful method for simulation of diffusion processes in various systems. The accuracy of the method, however, relies on the extent of details used for the parameterization of the model. Migration barriers are often use
Externí odkaz:
http://arxiv.org/abs/1806.02976
Autor:
Vigonski, Simon, Jansson, Ville, Vlassov, Sergei, Polyakov, Boris, Baibuz, Ekaterina, Oras, Sven, Aabloo, Alvo, Djurabekova, Flyura, Zadin, Vahur
Publikováno v:
Simon Vigonski et al 2018 Nanotechnology 29 015704
Metallic nanowires are known to break into shorter fragments due to the Rayleigh instability mechanism. This process is strongly accelerated at elevated temperatures and can completely hinder the functioning of nanowire-based devices like e.g. transp
Externí odkaz:
http://arxiv.org/abs/1709.09104
Publikováno v:
Ville Jansson, Ekaterin Baibuz, Andreas Kyritsakis, and Flyura Djurabekova. Adatom diffusion in high electric fields. In 2017 30th International Vacuum Nanoelectronics Conference (IVNC), pages 40-41. IEEE, 2017. ISBN 978-1-5090-3973-9
Strong electric fields are known to create biased adatom migration on metallic surfaces. We present a Kinetic Monte Carlo model that can simulate adatom migration on a tungsten (W) surface in electric fields. We validate our model by using it to calc
Externí odkaz:
http://arxiv.org/abs/1709.04694
Autor:
Zadin, Vahur, Veske, Mihkel, Vigonski, Simon, Jansson, Ville, Muszinsky, Johann, Parviainen, Stefan, Aabloo, Aalvo, Djurabekova, Flyura
Onset of vacuum arcing near a metal surface is often associated with nanoscale asperities, which may dynamically appear due to different processes ongoing in the surface and subsurface layers in the presence of high electric fields. Thermally activat
Externí odkaz:
http://arxiv.org/abs/1708.05189
Autor:
Metspalu, Tarvo, Jansson, Ville, Zadin, Vahur, Avchaciov, Konstantin, Nordlund, Kai, Aabloo, Alvo, Djurabekova, Flyura
Publikováno v:
Nuclear Inst. and Methods in Physics Research, B 415C (2018) pp. 31-40
Self-sputtering of copper under high electric fields is considered to contribute to plasma buildup during a vacuum breakdown event frequently observed near metal surfaces, even in ultra high vacuum condition in different electric devices. In this stu
Externí odkaz:
http://arxiv.org/abs/1708.03173