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- Title
Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system.
- Authors
Uematsu, Yuto; Ishibe, Takafumi; Mano, Takaaki; Ohtake, Akihiro; Miyazaki, Hideki T.; Kasaya, Takeshi; Nakamura, Yoshiaki
- Abstract
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. Thermoelectric power factor in multiple two-dimensional electron gas in GaAs is enhanced by the effect of multiple subbands. The enhancement rate is 4 times larger than that of conventional two-dimensional electron gas system.
- Subjects
TWO-dimensional electron gas; THERMOELECTRIC power; QUANTUM confinement effects; SEEBECK coefficient; ELECTRON gas
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-44165-3