Zobrazeno 1 - 10
of 136
pro vyhledávání: '"Puska, M. J."'
Publikováno v:
Phys. Rev. B 97, 195406 (2018)
We present a computational study of the adhesive and structural properties of the Al/Al2O3 interfaces as building blocks of the Metal-Insulator-Metal (MIM) tunnel devices, where electron transport is accomplished via tunnelling mechanism through the
Externí odkaz:
http://arxiv.org/abs/1712.00518
Publikováno v:
Phys. Rev. Applied 9, 034010 (2018)
The conductivity of carbon nanotube (CNT) networks can be improved markedly by doping with nitric acid. In the present work, CNTs and junctions of CNTs functionalized with NO$_3$ molecules are investigated to understand the microscopic mechanism of n
Externí odkaz:
http://arxiv.org/abs/1710.05769
Publikováno v:
Journal of Physics D: Applied Physics 49, 165303 (2016)
We investigate how different interface geometries of an Al/Al$_2$O$_3$ junction, a common component of modern tunnel devices, affect electron transport through the tunnel barrier. We study six distinct Al/Al$_2$O$_3$ interfaces which differ in stacki
Externí odkaz:
http://arxiv.org/abs/1511.08636
Publikováno v:
Phys. Rev. A 85, 052707 (2012)
The many-body system comprising a He nucleus, three electrons, and a positron has been studied using the exact diagonalization technique. The purpose has been to clarify to which extent the system can be considered as a distinguishable positronium (P
Externí odkaz:
http://arxiv.org/abs/1202.6477
In carbon nanotubes, the most abundant defects, caused for example by irradiation or chemisorption treatments, are small perturbing clusters, i.e. bi-site defects, extending over both A and B sites. The relative positions of these perturbing clusters
Externí odkaz:
http://arxiv.org/abs/1101.0519
Autor:
Makkonen, I., Puska, M. J.
Publikováno v:
Physical Review B 76, 054119 (2007).
We report a computational first-principles study of positron trapping at vacancy defects in metals and semiconductors. The main emphasis is on the energetics of the trapping process including the interplay between the positron state and the defect's
Externí odkaz:
http://arxiv.org/abs/0704.2168
Publikováno v:
Physical Review B 75, 054201 (2007) (10 pages)
Electron-positron momentum distributions measured by the coincidence Doppler broadening method can be used in the chemical analysis of the annihilation environment, typically a vacancy-impurity complex in a solid. In the present work, we study possib
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609461
We study numerically the existence and character of bound states for positive and negative point charges shielded by the response of a two-dimensional homogeneous electron gas. The problem is related to many physical situations and has recently arise
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603462
Autor:
Torsti, T., Eirola, T., Enkovaara, J., Hakala, T., Havu, P., Havu, V., Höynälänmaa, T., Ignatius, J., Lyly, M., Makkonen, I., Rantala, T. T., Ruokolainen, J., Ruotsalainen, K., Räsänen, E., Saarikoski, H., Puska, M. J.
A characteristic feature of the state-of-the-art of real-space methods in electronic structure calculations is the diversity of the techniques used in the discretization of the relevant partial differential equations. In this context, the main approa
Externí odkaz:
http://arxiv.org/abs/cond-mat/0601201
Publikováno v:
Phys. Rev. B 73, 235324 (2006)
We predict the formation of giant vortices in quasi-two-dimensional quantum dots at high magnetic fields, i.e., in rapidly rotating electron droplets. Our numerical results of quantum dots confined by a flat, anharmonic potential show ground states w
Externí odkaz:
http://arxiv.org/abs/cond-mat/0509660