Temat: 73.23.-b - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Two-Dimensional Analytical Threshold Voltage Modelling of Pseudomorphic $Si_{0.8}Ge_{0.2}$ p-Channel MOSFETs
Autorzy:: Ansaripour, G.
Tematy:: 73.23.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1492776.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Mutual Inductance and Selfinductance in Mesoscopic Systems
Autorzy:: Zipper, E.
Dajka, J.
Szopa, M.
Tematy:: 73.23.Ra
73.23.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2035547.pdf Link otwiera się w nowym oknie
Opis:: The role played by the magnetostatic interaction in mesoscopic multichannel systems is discussed. We show that the interaction of currents from different channels, when taken in the selfconsistent mean field approximation, leads to selfinductance terms in the Hamiltonian producing an internal magnetic flux. Such multichannel systems can exhibit spontaneous flux or flux expulsion. The dependence of these phenomena on the parameters of the system is discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Terahertz Generation and Detection by Plasma Waves in Nanometer Gate High Electron Mobility Transistors
Autorzy:: Knap, W.
Łusakowski, J.
Teppe, F.
Dyakonova, N.
Meziani, Y.
Tematy:: 73.21.-b
73.23.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2041635.pdf Link otwiera się w nowym oknie
Opis:: The high electron mobility transistors can act as a resonator cavity for the plasma waves that can reach THz frequencies for a nanometer size devices. As was predicted by Dyakonov and Shur in 1993, the steady state of the current flow in a gated 2D electron gas can become unstable leading to the emission of an electromagnetic radiation at the plasma wave frequencies. The theory predicted also that the plasma waves can be used for resonant detection of THz electromagnetic radiation. In the present paper we review our recent experiments on THz emission and detection performed on high electron mobility transistors based on different semiconductor structures: InGaAs/GaAlAs, GaAs/GaAlAs, and Si.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of Magnetic Field on Dark States in Transport through Triple Quantum Dots
Autorzy:: Wrześniewski, K.
Weymann, I.
Tematy:: 73.23.-b
73.21.La; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1032454.pdf Link otwiera się w nowym oknie
Opis:: We theoretically study the electronic transport through a triple quantum dot system in triangular geometry weakly coupled to external metallic leads. By means of the real-time diagrammatic technique, the current and Fano factor are calculated in the lowest order of perturbation theory. The device parameters are tuned to such transport regime, in which coherent population trapping of electrons in quantum dots due to the formation of dark states occurs. The presence of such states greatly influences transport properties leading to a strong current blockade and enhanced, super-Poissonian shot noise. We consider both one- and two-electron dark states and examine the influence of magnetic field on coherent trapping in aforementioned states. When the system is in one-electron dark state, we observe a small shift of the blockade's region, whereas in the case of two-electron dark state, we show that strong magnetic field can lift the current blockade completely.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Tunneling of Interacting Fermions in 1D Systems
Autorzy:: Gendiar, A.
Moško, M.
Vagner, P.
Németh, R.
Tematy:: 73.23.-b
73.61.Ey; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2043712.pdf Link otwiera się w nowym oknie
Opis:: Using the self-consistent Hartree-Fock approximation for spinless electrons at zero temperature, we study tunneling of the interacting electron gas through a single δ barrier in a finite one-dimensional wire connected to contacts. Our results exhibit features known from correlated many-body models. In particular, the conductance decays with the wire length as ∝ L$\text{}^{-2α}$, where the powerα is universal. We also show that a similar result for a wire conductance can be extracted from the persistent current (I) through theδ barrier in a one-dimensional ring, where it is known that I∝ L$\text{}^{-1-α}$.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Quantum-Interference Semiconductor Devices Revisited
Autorzy:: Figielski, T.
Tematy:: 73.23.-b
85.30.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2027427.pdf Link otwiera się w nowym oknie
Opis:: First, a simple semiclassical approach has been applied to the problem of a quantum phase acquired by an electron carrying both the charge and spin, which travels in an electromagnetic field. Basic hypothetical devices whose operation relies on the quantum interference, including spin-related interference, are discussed in the following. Finally, experimental results demonstrating two-beam interference in a planar quantum dot are presented.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Current Shot Noise and Bunching of Electrons in Multilevel Quantum Dots
Autorzy:: Michałek, G.
Bułka, B.
Tematy:: 73.23.-b
72.70.+m; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813512.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Many-Channel Landauer-Like Conductance Formula in a Uniform Magnetic Field
Autorzy:: Benamira, F.
Abdellaoui, A.
Tematy:: 73.23.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1418271.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Electron Transport in Magnetic Quantum Point Contacts
Autorzy:: Pietsch, T.
Egle, S.
Espy, C.
Strigl, F.
Scheer, E.
Tematy:: 73.23.-b
72.25.-b
73.63.-b; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1490057.pdf Link otwiera się w nowym oknie
Opis:: In recent years, the fabrication of novel building blocks for quantum computation- and spintronics devices gained significant attention. The ultimate goal in terms of miniaturization is the creation of single-atom functional elements. Practically, quantum point contacts are frequently used as model systems to study the fundamental electronic transport properties of such mesoscopic systems. A quantum point contact is characterised by a narrow constriction coupling two larger electron reservoirs. In the absence of a magnetic field, the conductance of these quantum point contacts is quantised in multiples of $2 e^2//h$, the so-called conductance quantum $(G_0)$. However, in the presence of magnetic fields the increased spin-degeneracy often gives rise to a deviation from the idealized behaviour and therefore leads to a change in the characteristic conductance of the quantum point contact. Herein, we illustrate the complex magnetotransport characteristics in quantum point contacts and magnetic heterojunctions. The theoretical framework and experimental concepts are discussed briefly together with the experimental results as well as potential applications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: On the Quantum Transport through an Asymmetric Aharonov-Bohm Ring with Rashba Spin-Orbit Interaction
Autorzy:: Baltateanu, D.
Tematy:: 73.23.-b
71.70.Ej
73.23.Ad; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1492777.pdf Link otwiera się w nowym oknie
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).
Dostawca treści:: Biblioteka Nauki

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