Temat: 72.50.+b - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: An Improved 2.5 GHz Electron Pump: Single-Electron Transport through Shallow-Etched Point Contacts Driven by Surface Acoustic Waves
Autorzy:: Utko, P.
Gloos, K.
Hansen, J. B.
Lindelof, P. E.
Powiązania:: https://bibliotekanauki.pl/articles/2035753.pdf
Data publikacji:: 2003-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.63.Kv
72.50.+b
06.20.Jr
Opis:: We present an experimental study of a 2.5 GHz electron pump based on the quantized acoustoelectric current driven by surface acoustic waves through a shallow-etched point contact in a GaAs/AlGaAs heterostructure. At low temperatures and with an additional counter-propagating surface acoustic waves beam, up to n=20 current plateaus at I=nef could be resolved, where n is an integer, e the electron charge, and f the surface acoustic waves frequency. In the best case the accuracy of the first plateau at 0.40 nA was estimated to beΔ I/I=±25 ppm over 0.25 mV in gate voltage, which is better than previous results.
Źródło:: Acta Physica Polonica A; 2003, 103, 6; 533-538
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

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: 3.

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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