Temat: LW - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of Magnetic Zigzag Edges in Graphene-like Nanoribbons on the Thermoelectric Power Factor
Autorzy:: Krompiewski, S.
Cuniberti, G.
Powiązania:: https://bibliotekanauki.pl/articles/1030504.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.63.Kv
72.25.-b
73.50.Lw
Opis:: This study shows that magnetic edge states of graphene-like nanoribbons enhance effectively the thermoelectric performance. This is due to the antiparallel alignment of magnetic moments on opposite zigzag edges and the confinement effect, which jointly lead to the appearance of a gap in the electronic energy spectrum. Consequently, the Seebeck coefficient as well as the thermoelectric power factor get strongly enhanced (with respect to other alignment cases) at room temperature and energies not far away from the charge neutrality point. Moreover the corresponding figure of merit (ZT) is also improved as a result of the reduced electronic thermal conductance.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 535-537
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Spin Thermoelectric Effects in Transport through a Two-Level Quantum Dot Coupled to Ferromagnetic Leads
Autorzy:: Karwacki, Ł.
Trocha, P.
Barnaś, J.
Powiązania:: https://bibliotekanauki.pl/articles/1427587.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.21.La
73.23.-b
73.63.Kv
73.50.Lw
Opis:: We investigate spin thermoelectric effects in a two-level quantum dot attached to external ferromagnetic leads. The basic thermoelectric coefficients are calculated by means of the non-equilibrium Green functions approach in the mean field approximation for the Coulomb term. Specifically, we calculate spin-dependent thermopower (spin Seebeck coefficient) and the charge thermopower. These coefficients measure spin and charge voltage drops across the device, respectively. Moreover, the figure of merit and its spin analog (which measures the spin thermoelectric efficiency) are presented and discussed. We also show that the indirect (via the leads) coupling between the dot's levels can significantly enhance the thermoelectric effects.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1207-1209
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Mesoscopic Structures for Microwave-THz Detection
Autorzy:: Sužied.elis, A.
Ašmontas, S.
Požela, J.
Kundrotas, J.
Širmulis, E.
Gradauskas, J.
Kozič, A.
Kazlauskaité, V.
Anbinderis, T.
Powiązania:: https://bibliotekanauki.pl/articles/1813189.pdf
Data publikacji:: 2008-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.21.Fg
73.40.Kp
73.50.Lw
73.63.Kv
Opis:: Properties of microwave detectors of various design on the base of MBE grown GaAs and AlGaAs structures are discussed in this paper: simple asymmetrically shaped structures with heavily doped GaAs and AlGaAs layers of nanometric thickness as well as diodes with two-dimensional electron gas layers. Novel models of the detectors with partially gated two-dimensional electron gas layer as well as with small area GaAs/AlGaAs heterojuction are discussed to demonstrate different ways to increase the voltage sensitivity of the detectors of electromagnetic radiation in GHz-THz frequency range.
Źródło:: Acta Physica Polonica A; 2008, 113, 3; 803-809
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Thermoelectric Transport through a Quantum Dot Coupled to a Normal Metal and BCS Superconductor
Autorzy:: Krawiec, M.
Powiązania:: https://bibliotekanauki.pl/articles/1812283.pdf
Data publikacji:: 2008-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.63.Kv
73.23.-b
73.50.Lw
72.15.Qm
74.45.+c
Opis:: We discuss thermoelectric properties of a quantum dot coupled to one normal and one superconducting lead in the presence of the Kondo effect and the Andreev scattering. We will focus on conductance, thermal conductance, thermopower and related quantities like thermoelectric figure of merit which is a direct measure of the usefulness of the system for applications and the Wiedemann-Franz ratio which indicates if the system is in the Fermi liquid state. We will show that the superconductivity strongly modifies the thermal properties of the system. In particular, the thermopower is strongly enhanced near the superconducting transition temperature. Moreover, the Andreev reflections are suppressed due to strong on-dot Coulomb repulsion. The suppression of the Andreev reflections leads to a violation of the Wiedemann-Franz law and to a non-Fermi liquid ground state.
Źródło:: Acta Physica Polonica A; 2008, 114, 1; 115-122
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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