| タイトル | Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system |
| DOI | https://doi.org/10.1038/S41467-023-44165-3 |
| 本文（外部サイト） | https://ir.library.osaka-u.ac.jp/repo/ouka/all/93615/NatCommun_15_1_322.pdf |
| 著者（英） | Uematsu, Yuto; Ishibe, Takafumi; Mano, Takaaki; Ohtake, Akihiro; Miyazaki, Hideki T.; Kasaya, Takeshi; Nakamura, Yoshiaki |
| 発行日 | 2024-01-16 |
| 発行機関など | Nature Research |
| 刊行物名 | Nature Communications |
| 巻 | 15 |
| 号 | 1 |
| 開始ページ | 322 |
| 言語 | eng |
| 内容記述 | Uematsu Y., Ishibe T., Mano T., et al. Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system. Nature Communications 15, 322 (2024); https://doi.org/10.1038/S41467-023-44165-3.
Toward drastic enhancement of thermoelectric power factor, quantum confinement effect proposed by Hicks and Dresselhaus has intrigued a lot of researchers. There has been much effort to increase power factor using step-like density-of-states in two-dimensional electron gas (2DEG) system. Here, we pay attention to another effect caused by confining electrons spatially along one-dimensional direction: multiplied 2DEG effect, where multiple discrete subbands contribute to electrical conduction, resulting in high Seebeck coefficient. The power factor of multiple 2DEG in GaAs reaches the ultrahigh value of ~100 μWcm−1 K−2 at 300 K. We evaluate the enhancement rate defined as power factor of 2DEG divided by that of three-dimensional bulk. The experimental enhancement rate relative to the theoretical one of conventional 2DEG reaches anomalously high (~4) in multiple 2DEG compared with those in various conventional 2DEG systems (~1). This proposed methodology for power factor enhancement opens the next era of thermoelectric research. |
| 権利 | This article is licensed under a Creative Commons Attribution 4.0 International License. |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/1235250 |
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