Autor: Zwierzycki, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Transport Properties of Rippled Graphene
Autorzy:: Zwierzycki, M.
Powiązania:: https://bibliotekanauki.pl/articles/1428651.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.ue
72.10.Fk
72.80.Vp
Opis:: It is common to describe graphene as ideally flat plane, however there exists both theoretical and experimental evidence that it is most usual to find it in a rippled state. The ripples can be either induced by the substrate or formed spontaneously in suspended graphene. The lateral size of such features ranges between several and tens of nanometers with the height of up to 1 nm. It has been suggested that the presence of ripples could be one of the factors ultimately limiting mobility of carriers and that it may be also responsible, by introducing an effective gauge field, for the lack of weak localization observed in certain graphene samples. In the present contribution the transport properties of the rippled graphene are studied theoretically starting with the simple case of one-dimensional modulation. Using either single-band or the full $sp^3$ tight-binding Hamiltonians we compare and discuss the importance of two ripple-related mechanisms of scattering: the variation of interatomic distances and hybridization between π and σ bands of graphene.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1246-1249
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Ab Initio Study of the Edge States of Graphene Nanoribbons in the Presence of Electrodes
Autorzy:: Zwierzycki, M.
Krompiewski, S.
Powiązania:: https://bibliotekanauki.pl/articles/1534182.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.At
73.40.Ns
Opis:: Thanks to its outstanding electronic properties, like very high mobility of carriers, graphene has emerged in recent years as exciting candidate for use in new electronic devices. When it is patterned in the form of ribbons with widths in the range of nanometers, its transport properties become strongly influenced by the presence of the states localized at the edges of the ribbon. Using first principles calculations we study the properties of these states for both isolated ribbons and in the presence of metallic electrodes. The calculations were performed for end contacted geometry i.e. for graphene sheets at right angle to the electrodes. Both para- and ferromagnetic electrodes were considered.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 856-858
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Overlapping Muffin-Tin Approximation
Autorzy:: Zwierzycki, M.
Andersen, O.
Powiązania:: https://bibliotekanauki.pl/articles/1810287.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.15.-m
71.15.Ap
Opis:: We present the formalism and demonstrate the use of the overlapping muffin-tin approximation. This fits a full potential to a superposition of spherically symmetric short-ranged potential wells plus a constant. For one-electron potentials of this form, the standard multiple-scattering methods can solve Schrödingers' equation correctly to 1st order in the potential overlap. Choosing an augmented-plane-wave method as the source of the full potential, we illustrate the procedure for diamond-structured Si. First, we compare the potential in the Si-centered overlapping muffin-tin approximation with the full potential, and then compare the corresponding overlapping muffin-tin approximation N-th order muffin-tin orbital and full-potential linear augmented plane wave band structures. We find that the two latter agree qualitatively for a wide range of overlaps and that the valence bands have a root mean squared deviation of 20 meV/electron for 30% radial overlap. Smaller overlaps give worse potentials and larger overlaps give larger 2nd-order errors of the multiple-scattering method. To further remove the mean error of the bands for small overlaps is simple.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 64-68
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Perpendicular and Parallel Transport, and Interlayer Exchange Coupling in Magnetic Trilayers with Extra Cap-Layers
Autorzy:: Krompiewski, S.
Zwierzycki, M.
Powiązania:: https://bibliotekanauki.pl/articles/2013211.pdf
Data publikacji:: 2000-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.-i
75.70.pa
73.23.ad
Opis:: Oscillations of Magnetoresistance and Interlayer Exchange Coupling Vs. both Non-magnetic Spacer and Cap-layer Thicknesses Are Studied Within the Framework of the S-d Model. the Studies Are Carried Out by Means of the Kubo Formula and a Green Function Recursion Technique. Transport Calculations Concern Multilayers (sandwiched Between Two Semi-infinite Ideal Lead Wires) Oriented Either Parallel Or Perpendicular To the Current Direction. the Considered Structures for the Above Mentioned Two Basic Geometries, Are Cubic Grains Identical In: (i) Size, (ii) Number of Sublayers, and (iii) Thicknesses of Particular Sublayers, Which Makes It Possible To Compare, in a Direct and Reliable Way, the Corresponding Magnetoresistances. the Current-in-plane Magnetoresistance Is Found To Be Usually Lower Than the Current-perpendicular-to-plane One, But Both of Them Show Oscillatory Behaviours Mutually Correlated, and Related To the Fermi Surface Callipers. moreover, the Current-perpendicular-to-plane Giant Magnetoresistance for Structures in a Form of Infinite in Layer-plane Trilayers Capped with An Extra Bilayer (ferromagnet/paramagnet) Is Also Discussed.
Źródło:: Acta Physica Polonica A; 2000, 97, 3; 555-558
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Magnetic properties of hexagonal graphene nanomeshes
Autorzy:: Zwierzycki, M.
Ryndyk, D.
Powiązania:: https://bibliotekanauki.pl/articles/1054780.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.22.Pr
75.75.-c
72.25.Dc
Opis:: Graphene nanomeshes are the nanostructures consisting of graphene flake with a regular pattern of antidots (holes) punched through it. Thanks to the energy gaps opening in electronic spectrum, nanomesh-based transistors offer improved I_{on}/I_{off} ratio of the collector current while supporting up to 100 larger driving currents than nanoribbon-based devices. In this paper the electronic and magnetic structure of graphene nanomeshes with hexagonally shaped antidots was studied. It has been found that the internal zigzag edges support magnetic moments and that lowest energy magnetic configuration is antiferromagnetic. The density of states calculated for ground state configuration exhibit the energy gap which can be substantially reduced upon switching (e.g. by external magnetic field) to ferromagnetic configuration. Based on this we predict that the structure will exhibit magnetoresistive effect, which makes graphene nanomeshes of this kind relevant for spintronic applications.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 830-832
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Search for innovative solutions in building isothermal bodies for food carriage
Poszukiwanie innowacyjnych rozwiązań w budowie nadwozi izotermicznych do przewozu żywności
Autorzy:: Bieńczak, K.
Bieńczak, M.
Górny, K.
Rochatka, T.
Stachowiak, A.
Tyczewski, P.
Zwierzycki, W.
Powiązania:: https://bibliotekanauki.pl/articles/336622.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:: food carriage
isothermal vehicle
heat-insulating materials
sandwich plates
thermovision photographs
analysis
przewóz żywności
pojazd izotermiczny
materiał termoizolacyjny
płyta warstwowa
analiza
zdjęcia termowizyjne
Opis:: This paper outlines the research area of new heat-insulating materials useful for the production of sandwich plate for building isothermal bodies. It also presents the inappropriate solutions of construction nodes causing the occurrence of heat leakage bridges, and thus the increase of the value of overall heat-transfer coefficient (of the whole body). The last part of the paper presents the advancement procedure for the prototype isothermal body. Information obtained on the basis of the analysis of the thermovision photographs (as well as local measurements of heat-transfer coefficient values) is very important for this procedure. The presented information is connected with the realisation of the research project PBS1/B6/6/2012 “Elaboration of production technology for complete semi-trailer for food transport in refrigeration conditions of improved technological parameters” (a leader - the firm Wielton from Wielun, consortium members: Poznań University of Technology and Industrial Institute of Agricultural Machines in Poznan [2]).
W artykule zarysowano obszar poszukiwania nowych materiałów termoizolacyjnych przydatnych do produkcji rdzeni płyt warstwowych w budowie nadwozi izotermicznych. Pokazano również niewłaściwe rozwiązania węzłów konstrukcyjnych prowadzące do powstania mostków ciepła, a tym samym do wzrostu wartości globalnego współczynnika przenikalności cieplnej (całego nadwozia). W ostatniej części artykułu zaprezentowano procedurę doskonalenia prototypowego nadwozia izotermicznego. W procedurze tej bardzo istotne są informacje uzyskane z analizy zdjęć termowizyjnych (oraz wyniki pomiarów lokalnych wartości współczynnika przenikania ciepła). Przedstawione informacje mają związek z realizacją projektu badawczego PBS1/B6/6/2012 „Opracowanie technologii produkcji kompletnej naczepy do przewozu żywności w warunkach chłodniczych o ulepszonych parametrach technicznych” (lider - firma Wielton z Wielunia, konsorcjanci: Politechnika Poznańska i Przemysłowy Instytut Maszyn Rolniczych w Poznaniu [2]).
Źródło:: Journal of Research and Applications in Agricultural Engineering; 2014, 59, 2; 21-25
1642-686X
2719-423X
Pojawia się w:: Journal of Research and Applications in Agricultural Engineering
Dostawca treści:: Biblioteka Nauki

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