Spin Texture Tunability in Mn1−xGexBi2Te4 through Varying Ge Concentration | Sciact - CRIS-system of Boreskov Institute of Catalysis

Spin Texture Tunability in Mn1−xGexBi2Te4 through Varying Ge Concentration Full article

Journal

Physical Review B (started in 2016)
ISSN: 2469-9950 , E-ISSN: 2469-9969

Output data

Year: 2025, Volume: 111, Number: 11, Article number : 115158, Pages count : 10 DOI: 10.1103/physrevb.111.115158

Tags

Dispersion (waves); Electric insulators; Germanium alloys; Germanium oxides; Photoacoustic spectroscopy; Spin fluctuations; Spin waves; Topological insulators; X ray photoelectron spectroscopy

Authors

Shikin A.M. ¹ , Estyunin D.A. ¹ , Zaitsev N.L. ^2,1 , Estyunina T.P. ¹ , Eryzhenkov A.V. ¹ , Rybkin A.G. ¹ , Kokh K.A. ^1,3 , Tereshchenko O.E. ^4,5,1 , Iwata T. ^6,7 , Kuroda K. ^6,7,8 , Miyamoto K. ⁹ , Okuda T. ^7,8,9 , Shimada K. ^6,7,8,9 , Tarasov A.V. ¹

Affiliations

1	Saint Petersburg State University, 198504 Saint Petersburg, Russia
2	Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450075 Ufa, Russia
3	Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
4	Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
5	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, 630559 Koltsovo, Russia
6	Graduate School of Advanced Science and Engineering, Hiroshima University, 739-8526 Higashi-Hiroshima, Japan
7	International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2, Hiroshima University, 739-8526 Higashi-Hiroshima, Japan
8	Research Institute for Semiconductor Engineering (RISE), Hiroshima University, 739-8527 Higashi-Hiroshima, Japan
9	Research Institute for Synchrotron Radiation Science (HiSOR), Hiroshima University, 739-0046 Higashi-Hiroshima, Japan

Funding (6)

1	Russian Science Foundation	23-12-00016 (123060600015-0)
2	Government of the Russian Federation	ДЧ-П8-45981 (125022702939-2)
3	Ministry of Science and Higher Education of the Russian Federation	FWUR-2024-0040
4	Ministry of Science and Higher Education of the Russian Federation	FWZN-2022-0029 (122041400031-2)
5	Hiroshima University	23BU003
6	Hiroshima University	23AU012

Spin-resolved dispersions for the topological insulator Mn1−xGexBi2Te4 along the K¯Γ¯K¯ path of the Brillouin zone were studied using spin- and angle-resolved photoemission spectroscopy with laser radiation with varying Ge concentrations (x from 0.1 to 0.8) for in-plane (sx) and out-of-plane (sz) spin orientations. Rashba-like states were observed, shifting to lower energies with increasing Ge content and dominating spin-dependent dispersions for x from 50% to 75%. These states exhibit pronounced asymmetry in both in-plane (sy) and outof-plane (sz) spin polarizations for opposite ±k directions, arising from time-reversal and inversion symmetry breaking. Theoretical calculations confirmed this asymmetry along the K¯Γ¯K¯ path. Constant energy maps reveal a pronounced sz spin component along Γ¯K¯ , with a sign change crossing Γ¯M¯ . The observed spin polarization. suggests potential applications in spin devices based on magnetic topological insulators.Spin-resolved dispersions for the topological insulator Mn1−xGexBi2Te4 along the K¯Γ¯K¯ path of the Brillouin zone were studied using spin- and angle-resolved photoemission spectroscopy with laser radiation with varying Ge concentrations (x from 0.1 to 0.8) for in-plane (sx) and out-of-plane (sz) spin orientations. Rashba-like states were observed, shifting to lower energies with increasing Ge content and dominating spin-dependent dispersions for x from 50% to 75%. These states exhibit pronounced asymmetry in both in-plane (sy) and outof-plane (sz) spin polarizations for opposite ±k directions, arising from time-reversal and inversion symmetry breaking. Theoretical calculations confirmed this asymmetry along the K¯Γ¯K¯ path. Constant energy maps reveal a pronounced sz spin component along Γ¯K¯ , with a sign change crossing Γ¯M¯ . The observed spin polarization suggests potential applications in spin devices based on magnetic topological insulators.

Shikin A.M. , Estyunin D.A. , Zaitsev N.L. , Estyunina T.P. , Eryzhenkov A.V. , Rybkin A.G. , Kokh K.A. , Tereshchenko O.E. , Iwata T. , Kuroda K. , Miyamoto K. , Okuda T. , Shimada K. , Tarasov A.V.
Spin Texture Tunability in Mn1−xGexBi2Te4 through Varying Ge Concentration
Physical Review B (started in 2016). 2025. V.111. N11. 115158 :1-10. DOI: 10.1103/physrevb.111.115158 WOS Scopus РИНЦ OpenAlex publication_identifier_short.sciact_skif_identifier_type

Submitted:	Oct 22, 2024
Accepted:	Mar 10, 2025
Published print:	Mar 15, 2025
Published online:	Mar 26, 2025

Web of science:	WOS:001457303000003
Scopus:	2-s2.0-105001163751
Elibrary:	81943894
OpenAlex:	W4408868574
publication_identifier.sciact_skif_identifier_type:	3817

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