Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling

Kondo, M.; Kimata, M.; Ochi, M.; Kaneko, T.; Kuroki, K.; Sudo, K.; Sakaguchi, S.; Murakawa, H.; Hanasaki, N.; Sakai, H.

doi:https://doi.org/10.1103/PhysRevResearch.7.013041

Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling

Kondo, M.; Kimata, M.; Ochi, M. et al.

Physical Review Research, 2025, 7(1), 013041

Number of Access:1,185（2025-08-14 01:55 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/100436

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Title	Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling
Creator	CreatorName Kondo, M.
	NRID 1000020462517 1000020462517 CreatorName Kimata, M.
	NRID 1000010734353 1000010734353 researchmap permalink masaochi masaochi Scopus Author ID 55094552700 55094552700 ORCID 0000-0001-7438-4797 0000-0001-7438-4797 CreatorName Ochi, M.
	NRID 1000030784433 1000030784433 researchmap permalink tatsuya_kaneko tatsuya_kaneko CreatorName Kaneko, T.
	NRID 1000010242091 1000010242091 ORCID 0009-0001-0252-2764 0009-0001-0252-2764 researchmap permalink read0087399 read0087399 Scopus Author ID 7102448574 7102448574 CreatorName Kuroki, K.
	CreatorName Sudo, K.
	CreatorName Sakaguchi, S.
	NRID 1000040611744 1000040611744 researchmap permalink 40611744 40611744 Scopus Author ID 55341979700 55341979700 CreatorName Murakawa, H.
	NRID 1000070292761 1000070292761 researchmap permalink 7220062 7220062 Scopus Author ID 7004928519 7004928519 CreatorName Hanasaki, N.
	NRID 1000020534598 1000020534598 ORCID 0000-0001-9839-1377 0000-0001-9839-1377 researchmap permalink 7000018618 7000018618 Scopus Author ID 55725908900 55725908900 CreatorName Sakai, H.
Description	Kondo M., Kimata M., Ochi M., et al. Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling. Physical Review Research 7, 013041 (2025); https://doi.org/10.1103/PhysRevResearch.7.013041.
Abstract	Nonreciprocal charge transport in solids, where resistance is different between rightward and leftward currents, is a key function of rectifying devices in modern electronics, as exemplified by p-n semiconductor junctions. Recently, this was also demonstrated in noncentrosymmetric materials in magnetic fields since their band structure exhibits spin polarization coupled to the position of momentum space due to antisymmetric spin-orbit coupling. To enhance the magnitude of the nonreciprocal effect, it is essential to tune such spin-momentum coupling, which has been hampered in conventional materials owing to the difficulty in controlling the broken inversion symmetry built into the lattice and interfacial structures. Here, we report large nonreciprocal resistivity in the layered polar metal BaMnX2 (X=Sb, Bi), where the spin-polarized Dirac dispersion depends on the in-plane polarization tunable by chemical substitution of the X site. For X=Sb with a pair of single-type valleys, the nonreciprocal resistivity increases monotonically with decreasing temperature, while for X=Bi with multiple types of valleys it is reduced by about an order of magnitude and exhibits a peak at a low temperature. Theoretical calculations indicate that the nonreciprocal resistivity is sensitive not only to the spin-momentum (spin-valley) coupling but also to the Fermi energy and the Dirac dispersion. The observed significant variation of nonreciprocal transport in the same series of materials might be of great use in the design of junction-free rectifying devices and circuits.
Publisher	American Physical Society
Source Title	Physical Review Research
Volume (Issue)	7(1)
Page	013041
Date of Issued	2025-01-10
Language	English
Handle URL	https://hdl.handle.net/11094/100436
PISSN	26431564
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1103/PhysRevResearch.7.013041
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
DCTERMS.bibliographicCitation	Physical Review Research. 2025, 7(1), p. 013041
DC.title	Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling
DC.creator	Kondo, M.
	Kimata, M.
	Ochi, M.
	Kaneko, T.
	Kuroki, K.
	Sudo, K.
	Sakaguchi, S.
	Murakawa, H.
	Hanasaki, N.
	Sakai, H.
DC.publisher	American Physical Society
DC.language' scheme='DCTERMS.RFC1766	English
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-01-10
DC.identifier	https://doi.org/10.1103/PhysRevResearch.7.013041
DC.description	Kondo M., Kimata M., Ochi M., et al. Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling. Physical Review Research 7, 013041 (2025); https://doi.org/10.1103/PhysRevResearch.7.013041.
DCTERMS.abstract	Nonreciprocal charge transport in solids, where resistance is different between rightward and leftward currents, is a key function of rectifying devices in modern electronics, as exemplified by p-n semiconductor junctions. Recently, this was also demonstrated in noncentrosymmetric materials in magnetic fields since their band structure exhibits spin polarization coupled to the position of momentum space due to antisymmetric spin-orbit coupling. To enhance the magnitude of the nonreciprocal effect, it is essential to tune such spin-momentum coupling, which has been hampered in conventional materials owing to the difficulty in controlling the broken inversion symmetry built into the lattice and interfacial structures. Here, we report large nonreciprocal resistivity in the layered polar metal BaMnX2 (X=Sb, Bi), where the spin-polarized Dirac dispersion depends on the in-plane polarization tunable by chemical substitution of the X site. For X=Sb with a pair of single-type valleys, the nonreciprocal resistivity increases monotonically with decreasing temperature, while for X=Bi with multiple types of valleys it is reduced by about an order of magnitude and exhibits a peak at a low temperature. Theoretical calculations indicate that the nonreciprocal resistivity is sensitive not only to the spin-momentum (spin-valley) coupling but also to the Fermi energy and the Dirac dispersion. The observed significant variation of nonreciprocal transport in the same series of materials might be of great use in the design of junction-free rectifying devices and circuits.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	100436
citation_title	Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling
citation_author	Kondo, M.
	Kimata, M.
	Ochi, M.
	Kaneko, T.
	Kuroki, K.
	Sudo, K.
	Sakaguchi, S.
	Murakawa, H.
	Hanasaki, N.
	Sakai, H.
citation_publisher	American Physical Society
citation_language	English
citation_date	2025-01-10
citation_journal_title	Physical Review Research
citation_volume	7
citation_issue	1
citation_firstpage	013041
citation_doi	https://doi.org/10.1103/PhysRevResearch.7.013041
citation_public_url	https://hdl.handle.net/11094/100436

Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling

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