Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system

Uematsu, Yuto; Ishibe, Takafumi; Mano, Takaaki; Ohtake, Akihiro; Miyazaki, Hideki T.; Kasaya, Takeshi; Nakamura, Yoshiaki

doi:https://doi.org/10.1038/S41467-023-44165-3

Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system

Uematsu, Yuto; Ishibe, Takafumi; Mano, Takaaki et al.

Nature Communications, 2024, 15(1), 322

Number of Access:775（2025-08-28 23:57 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/93615

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Title	Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system
Creator	CreatorName Uematsu, Yuto
	NRID 1000050837359 1000050837359 ORCID 0000-0002-8662-875X 0000-0002-8662-875X researchmap permalink t-ishibe t-ishibe Scopus Author ID 55925365500 55925365500 CreatorName Ishibe, Takafumi
	NRID 1000060391215 1000060391215 CreatorName Mano, Takaaki
	NRID 1000030267398 1000030267398 CreatorName Ohtake, Akihiro
	NRID 1000010262114 1000010262114 CreatorName Miyazaki, Hideki T.
	CreatorName Kasaya, Takeshi
	NRID 1000060345105 1000060345105 researchmap permalink research_nakamura research_nakamura Scopus Author ID 55615390400 55615390400 ORCID 0000-0002-5387-1630 0000-0002-5387-1630 CreatorName Nakamura, Yoshiaki
Description	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.
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.
Publisher	Nature Research
Source Title	Nature Communications
Volume (Issue)	15(1)
Page	322
Date of Issued	2024-01-16
Language	English
Handle URL	https://hdl.handle.net/11094/93615
eISSN	20411723
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1038/S41467-023-44165-3
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Nature Communications. 2024, 15(1), p. 322
DC.title	Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system
DC.creator	Uematsu, Yuto
	Ishibe, Takafumi
	Mano, Takaaki
	Ohtake, Akihiro
	Miyazaki, Hideki T.
	Kasaya, Takeshi
	Nakamura, Yoshiaki
DC.publisher	Nature Research
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-01-16
DC.identifier	https://doi.org/10.1038/S41467-023-44165-3
DC.description	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.
DCTERMS.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.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	93615
citation_title	Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system
citation_author	Uematsu, Yuto
	Ishibe, Takafumi
	Mano, Takaaki
	Ohtake, Akihiro
	Miyazaki, Hideki T.
	Kasaya, Takeshi
	Nakamura, Yoshiaki
citation_publisher	Nature Research
citation_language	English
citation_date	2024-01-16
citation_journal_title	Nature Communications
citation_volume	15
citation_issue	1
citation_firstpage	322
citation_doi	https://doi.org/10.1038/S41467-023-44165-3
citation_public_url	https://hdl.handle.net/11094/93615

Anomalous enhancement of thermoelectric power factor in multiple two-dimensional electron gas system

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