Autor: Bułka, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Dark States and Transport through Quantum Dots
Autorzy:: Tooski, S.
Bułka, B.
Powiązania:: https://bibliotekanauki.pl/articles/1428598.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.-w
33.57.+c
73.23.-b
73.63.Kv
Opis:: We consider current through triple and quadruple quantum dot systems in an in-plane electric field and in the sequential tunneling regime. The electric field breaks symmetry of the system and can trap electron in a dark state in which current flow can completely be blocked. Consequently rotating the electric field, one can observe current oscillations and blockades due to dark state.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1231-1233
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Singlet-Triplet Switching Induced by Electric Field in Triple Quantum Dots
Autorzy:: Łuczak, J.
Bułka, B.
Powiązania:: https://bibliotekanauki.pl/articles/1427582.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.-w
33.57.+c
73.23.-b
73.63.Kv
Opis:: We analyze influence of an external electric field on magnetic properties of a triple quantum dot system in a triangular and linear geometry. The system contains four electrons and is described by an extended Hubbard model which includes electron correlations and exchange processes. The electric field leads to splitting of energy levels (the Stark effect) and to transition between the singlet and triplet states.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1195-1197
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Interference Effects in Three-Terminal Hybrid Systems with Quantum Dots
Autorzy:: Michałek, G.
Bułka, B.
Powiązania:: https://bibliotekanauki.pl/articles/1403609.pdf
Data publikacji:: 2012-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.63.Kv
74.45.+c
73.23.-b
Opis:: Conductance in a three-terminal hybrid system with two quantum dots is analyzed. Our attention is focused on an influence of decoherence on interference effects in the Andreev transport. In particular, we have found that a change of coupling to the third electrode can strongly modify a shape of the Fano-type resonances. This effect is due to activation of nonlocal Andreev reflection (CAR) processes.
Źródło:: Acta Physica Polonica A; 2012, 122, 6; 981-983
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Current Shot Noise and Bunching of Electrons in Multilevel Quantum Dots
Autorzy:: Michałek, G.
Bułka, B.
Powiązania:: https://bibliotekanauki.pl/articles/1813512.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.23.-b
72.70.+m
Opis:: Currents and their fluctuations in multilevel quantum dots are studied theoretically in the limit of sequential tunneling. The spin degrees of freedom, many-body electronic states (singlet and triplet) as well as relaxation processes between the levels of the quantum dots are considered. In general, due to the rapid relaxation processes the shot noise is sub-Poissonian, however for a large polarization of the outgoing currents from the singlet and triplet states one gets the super-Poissonian type of the shot noise due to the bunching of tunneling events.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 27-30
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Linear and Non-Linear Response in T-Shaped Electron Waveguides
Autorzy:: Bek, M.
Bułka, B.
Wróbel, J.
Powiązania:: https://bibliotekanauki.pl/articles/1791289.pdf
Data publikacji:: 2009-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.23.-b
73.63.Rt
85.35.Ds
85.35.Be
Opis:: We present theoretical studies of three-terminal ballistic junction in linear and non-linear regime. Various conductance and voltage dips and peaks are observed and their origin is explained as influence of the bend resistance and the threshold effect.
Źródło:: Acta Physica Polonica A; 2009, 116, 5; 829-831
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Theoretical Studies of Quantum Interference in Electronic Transport through Carbon Nanotubes
Autorzy:: Babiaczyk, W. I.
Bułka, B. R.
Powiązania:: https://bibliotekanauki.pl/articles/2035583.pdf
Data publikacji:: 2002
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.-b
73.23.-b
73.63.Fg
Opis:: We performed studies of coherent electronic transport through a single walled carbon nanotube. In the calculations multiple scattering on the contacts and interference processes were taken into account. Conductance is a composition of contributions from different channels. We studied also spin-dependent transport in the system with ferromagnetic electrodes. The magnetoresistance is large and shows large oscillations, it can be even negative in some cases.
Źródło:: Acta Physica Polonica A; 2002, 102, 4-5; 597-602
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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