Magnetoresistance and Symmetry of a Two-Dimensional Electron Gas in AlGaN/AlN/GaN Heterostructures
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Published:2024-04
Issue:8
Volume:119
Page:604-609
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ISSN:0021-3640
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Container-title:JETP Letters
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language:en
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Short-container-title:Jetp Lett.
Author:
Chumakov N. K.,Andreev A. A.,Belov I. V.,Davydov A. B.,Ezubchenko I. S.,Lev L. L.,Morgun L. A.,Nikolaev S. N.,Chernykh I. A.,Shabanov S. Yu.,Strocov V. N.,Valeyev V. G.
Abstract
The physical characteristics of a two-dimensional electron gas located in the GaN layer near the AlN/GaN interface of AlGaN/AlN/GaN heterostructures have been studied for decades. According to the currently accepted concepts, its symmetry coincides with that of the nonsymmorphic space group C$$_{{6{v}}}^{4}$$ in the bulk of GaN. However, this is incorrect. Indeed, the only nonsymmorphic element of this group—the rotation of the system about the [0001] axis normal to the interface plane, with a simultaneous shift along this axis by half a period of the GaN crystal lattice—is forbidden for a two-dimensional gas owing to the confinement potential, which, therefore, reduces its symmetry to the symmetry of the trigonal point group C$$_{{3{v}}}$$. This fact has been confirmed in this work by ab initio density functional calculations and by electrophysical data.
Publisher
Pleiades Publishing Ltd
Reference14 articles.
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