Graduate theses
Current Record: 27 of 1665
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Title |
Magnetotransport investigations of low-density III-N HEMT structures |
Alternative Title |
Μελέτη φαινομένων μεταφοράς υπό μαγνητικό πεδίο σε δομές ΙΙΙ-Ν ΗΕΜΤ μικρής πυκνότητας φορέων |
Author
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Καβουσάκης, Εμμανουήλ
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Thesis advisor
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Ηλιόπουλος, Ελευθέριος
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Abstract |
Magnetotransport investigations in 2-dimensional electron gas (2DEG) AlGaN/GaN
corbino disks with low sheet densities, in the order of 1012𝑐𝑚-2, were performed, using
Shubnikov-de Haas oscillations analysis. The longitudinal magnetoresistance was measured,
in the temperature range of 1.8 – 15 𝐾 and magnetic fields up to 7 𝑇. The quantum and
transport mobility along with the electron effective mass and sheet density were calculated.
The quantum mobility was found to monotonically decrease with temperature, while the
transport mobility displayed a slight increase. The sheet density did not differ significantly with
temperature in the studied range. The ratio of transport to quantum mobility was measured
to be low (1.5 − 2). The electron effective mass was also accurately calculated, yielding a
value ~ 0.2321𝑚𝑒. Corbino disks with different outer radii were compared, resulting in disks
with smaller outer radius displaying lower overall mobilities.
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Language |
English |
Issue date |
2024-07-11 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/8/c/1/metadata-dlib-1718778869-34745-2946.tkl
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Views |
533 |
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