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Wyświetlanie 1-15 z 67
Tytuł:
Two-Dimensional Analytical Threshold Voltage Modelling of Pseudomorphic $Si_{0.8}Ge_{0.2}$ p-Channel MOSFETs
Autorzy:
Ansaripour, G.
Powiązania:
https://bibliotekanauki.pl/articles/1492776.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
Opis:
In this work we present an analytical model of the threshold voltage of SiGe p-channel metal oxide semiconductor field effect transistor based on the solution of the two-dimensional Poisson's equation and the ground state wave function of Fang and Howard, and taking into account the space charge in the channel and its effect on the surface potential. It is seen that the experimental data are well fitted within the experimental error that shows the appropriateness of the implemented model. Also comparing the calculated results to that of the calculated from the available recent reported models indicates a reasonable improvement to them.
Źródło:
Acta Physica Polonica A; 2011, 120, 6; 1043-1046
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Tytuł:
New Semiconductor Devices
Autorzy:
Balestra, F.
Powiązania:
https://bibliotekanauki.pl/articles/1811906.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.-i
73.20.-r
73.21.-b
73.23.-b
73.30.+y
73.40.-c
73.50.-h
73.63.-b
Opis:
A review of recently emerging semiconductor devices for nanoelectronic applications is given. For the end of the international technology roadmap for semiconductors, very innovative materials, technologies and nanodevice architectures will be needed. Silicon on insulator-based devices seem to be the best candidates for the ultimate integration of integrated circuits on silicon. The flexibility of the silicon on insulator-based structure and the possibility to realize new device architectures allow to obtain optimum electrical properties for low power and high performance circuits. These transistors are also very interesting for high frequency and memory applications. The performance and physical mechanisms are addressed in single- and multi-gate thin film Si, SiGe and Ge metal-oxide-semiconductor field-effect-transistors. The impact of tensile or compressive uniaxial and biaxial strains in the channel, of high k materials and metal gates as well as metallic Schottky source-drain architectures are discussed. Finally, the interest of advanced beyond-CMOS (complementary MOS) nanodevices for long term applications, based on nanowires, carbon electronics or small slope switch structures are presented.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 945-974
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Quantum Transport through an Asymmetric Aharonov-Bohm Ring with Rashba Spin-Orbit Interaction
Autorzy:
Baltateanu, D.
Powiązania:
https://bibliotekanauki.pl/articles/1492777.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
71.70.Ej
73.23.Ad
Opis:
The transmission amplitude through an asymmetric Aharonov-Bohm ring is derived analytically, in the presence of the Rashba spin-orbit interaction. For this purpose, one resorts to the transfer matrix method. The conductance is established in terms of the Landauer formalism and it is analyzed for different values of the asymmetry and ring-lead coupling parameters. A theoretical proposal to use the asymmetric ring like a spin filtering device is discussed, by an adequate tuning of the Aharonov-Bohm and Aharonov-Casher phases (via the magnetic field and the Rashba parameter).
Źródło:
Acta Physica Polonica A; 2011, 120, 6; 1047-1055
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Polarized Transport through Quantum Dots: Coulomb Blockade and Kondo Effect
Autorzy:
Barnaś, J.
Świrkowicz, R.
Wilczyński, M.
Weymann, I.
Martinek, J.
Dugaev, V.
Powiązania:
https://bibliotekanauki.pl/articles/2036886.pdf
Data publikacji:
2003-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.-b
73.23.Hk
72.15.Qm
Opis:
Spin related effects in electronic transport through quantum dots, coupled via tunneling barriers to two metallic leads, are discussed from the point of view of fundamental physics and possible applications in spin electronics. The effects follow either from long spin relaxation time in the dots or from spin dependent tunneling through the barriers when the external leads are ferromagnetic. In the former case large nonequilibrium spin fluctuations in the dot can be induced by flowing current. These fluctuations modify transport characteristics, particularly the shape of the Coulomb steps. In the latter case electric current depends on magnetic configuration of the system, and tunnel magnetoresistance effect due to magnetization rotation can occur. Transport properties in the weak coupling regime are described perturbatively in the first (sequential) and second (cotunneling) orders. In the strong coupling regime, on the other hand, the equation of motion for nonequilibrium Green functions is used to calculate electric current at low temperatures, where the Kondo peak in conductance is formed in the zero bias regime. In symmetrical systems the Kondo peak is split in the parallel magnetic configuration, whereas no splitting occurs for the antiparallel alignment. Theoretical results are discussed in view of available experimental data.
Źródło:
Acta Physica Polonica A; 2003, 104, 2; 165-177
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Tytuł:
Many-Channel Landauer-Like Conductance Formula in a Uniform Magnetic Field
Autorzy:
Benamira, F.
Abdellaoui, A.
Powiązania:
https://bibliotekanauki.pl/articles/1418271.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
Opis:
Linear-response theory is combined with the Landauer viewpoint to describe quantitatively transport in a four-lead mesoscopic structure within the presence of a uniform magnetic field. A new multichannel magnetoconductance formula is derived in the case where the magnetic field is perpendicular to the current-flow. The invariance under magnetic reversal test is confirmed.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 721-724
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entanglement Detection by Current Measurements in Double Quantum Dot System
Autorzy:
Busz, P.
Rożek, P.
Tomaszewski, D.
Martinek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1386781.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.Mn
03.67.Bg
73.23.-b
Opis:
The development of quantum computing in quantum dots systems requires highly efficient and continuous solid-state source of spatially separated spin-entangled electrons. One of the approaches is a use of double quantum dot system connected to superconducting lead, where Cooper pairs provide a source of naturally entangled electrons. Apart from the source, an useful tool for detection of quantum entanglement is needed. We present entanglement detection by the ferromagnetic electrodes using entanglement witness operator method and direct measurement of spin polarized current in the system. We investigate requirements that have to be fulfilled by ferromagnetic detectors.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 490-492
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrostatic Gates for GaN/AlGaN Quantum Point Contacts
Autorzy:
Czapkiewicz, M.
Cywiński, G.
Dybko, K.
Siekacz, M.
Wolny, P.
Gierałtowska, S.
Guziewicz, E.
Skierbiszewski, C.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1403637.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Qv
73.61.Ng
73.23.-b
Opis:
We report on AlGaN/GaN quantum point contacts fabricated by using e-beam lithography and dry ion etching. The tunable nano-constrictions are defined by the integration of side and top gates in a single device. In this configuration, the planar gates are located on the both sides of a quantum channel and the metallic top gates, which cover the active region, are separated from the substrate by an insulating and passivating layers of $HfO_2$ or $Al_2O_3//HfO_2$ composite. The properties of devices have been tested at T = 4.2 K. For side gates we have obtained a very small surface leakage current $I_g < 10^{-11}$ A at gate voltages $|V_g|$ < 2 V, however, it is not enough to close the quantum channel. With top gates we have been able to reach the pinch-off voltage at $V_g$ = - 3.5 V at a cost of $I_g ≈ 10^{-6} A$, which has been identified as a bulk leakage current.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1026-1028
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subgap Current through the Strongly Correlated Quantum Dot Hybridized with the Normal and Superconducting Leads
Autorzy:
Domański, T.
Donabidowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1810301.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
74.20.Fg
74.45.+c
Opis:
We investigate charge tunneling through the strongly correlated quantum dot placed between the metallic and superconducting leads. For small voltages |V| ≤ Δ/e applied across the junction the current is transmitted by the anomalous mechanism of the Andreev reflections. Such transport is sensitive to the strong Coulomb interactions which can be responsible for the charging effect and, at low temperatures, for appearance of the Kondo resonance. We analyze their signatures in the differential Andreev conductance.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 86-88
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The In-Gap Charge Current through the Correlated Quantum Dot Hybridized with Superconductor
Autorzy:
Donabidowicz, A.
Domański, T.
Powiązania:
https://bibliotekanauki.pl/articles/1812275.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
74.20.Fg
74.45.+c
Opis:
We explore the Andreev tunnelling through the strongly correlated quantum dot embedded between the normal and superconducting electrodes. For a small external voltage |eV| <$∆_s$ the electron arriving from the normal lead can be converted into a pair on the quantum dot and further propagates in the superconducting lead while simultaneously the hole is reflected back to the normal electrode. Conductance of such anomalous current is very sensitive to the particle-hole mixing of the quantum dot spectrum. We analyze the influence of the proximity effect and the Coulomb interactions on the differential Andreev conductance focusing on the extreme limit $∆_s$ → ∞.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 75-82
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunneling through the Quantum Dot Coupled between Normal and Superconducting Leads
Autorzy:
Donabidowicz, A.
Domański, T.
Wysokiński, K. I.
Powiązania:
https://bibliotekanauki.pl/articles/2047369.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
74.20.Fg
74.45.+c
Opis:
We study the charge tunneling via the quantum dot coupled to normal and superconducting leads, where the superconducting electrode has either an isotropic or anisotropic (of d-wave symmetry) energy gap. We use the single impurity Anderson model and apply the nonequilibrium Green function formalism to determine the differential tunneling conductance. The influence of the proximity effect between the quantum dot and superconductor on the transport properties of the system manifests itself in the Andreev conductance.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 157-160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunneling through the Quantum Dot Coupled to Incoherent Superconductor
Autorzy:
Donabidowicz, A.
Domański, T.
Powiązania:
https://bibliotekanauki.pl/articles/2047329.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.-b
74.20.Fg
74.45.+c
Opis:
We study the equilibrium and non-equilibrium properties of the strongly correlated quantum dot coupled between normal and superconducting leads. The effect of electron pair coherence, Coulomb interactions, and d-wave anisotropy of the order parameter are discussed with a particular account of their influence on a charge tunneling through the quantum dot.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 671-682
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Through a Single-Molecule Transistor: Master-Equation Approach
Autorzy:
Donabidowicz-Kolkowska, A.
Timm, C.
Powiązania:
https://bibliotekanauki.pl/articles/1431179.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.Hk
73.63.-b
81.65.+h
Opis:
In the present work we employ the master-equation approach to describe the transport through a molecule located in the central region between two external electrodes. In contrast to the transport through a quantum dot, electron-phonon coupling should be taken into account for tunnelling through a molecule. The coupling results in the appearance of additional effects such as vibrational sidebands or, for the case of strong coupling, a suppression of the current at low bias voltage (Franck-Condon blockade). In contrast to previous studies, the transport properties are described by the density matrix calculated explicitly with diagonal and off-diagonal elements. The observed phenomena are discussed and compared to previous studies.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 730-732
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Currents in Magnetic Nanostructures
Autorzy:
Dugaev, V.
Bruno, P.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811907.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.-b
73.23.Ra
75.75.+a
Opis:
We discuss some aspects of the problem of spin currents in magnetic nanostructures. One of them is related to the proper definition of the spin current and is generic for any electronic or magnetic system. Using the standard method related to the symmetry with respect to local spin transformations, we analyze the generation of equilibrium spin currents in inhomogeneous magnetic structures. As an example we consider the generation of persistent spin current in a mesoscopic ring.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 975-982
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 67

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