Chemical Composition Dependent Raman Scattering Spectroscopy of MBE Grown Manganese ‐ Based Bismuth Telluride Topological Insulator Thin Films | Sciact - CRIS-system of Boreskov Institute of Catalysis

Chemical Composition Dependent Raman Scattering Spectroscopy of MBE Grown Manganese ‐ Based Bismuth Telluride Topological Insulator Thin Films Full article

Journal

Journal of Raman Spectroscopy
ISSN: 0377-0486 , E-ISSN: 1097-4555

Output data

Year: 2025, Volume: 56, Number: 5, Pages: 409-419 Pages count : 11 DOI: 10.1002/jrs.6779

Tags

magnetic topological insulators | molecular beam epitaxy | polarization-resolved resonant Raman spectroscopy | vibrational modes

Authors

Kumar N. ^1,2 , Ishchenko Denis V. ¹ , Milekhin Ilya A. ^1,3 , Kyrova Ekaterina D. ^1,4 , Fedosenko Evgeny V. ¹ , Milekhin Alexander G. ^1,3 , Tereshchenko Oleg E. ^1,5,6

Affiliations

1	Rzhanov Institute of Semiconductor Physics, Novosibirsk, Russia
2	Tomsk State University, Tomsk, Russia
3	Novosibirsk State University, Novosibirsk, Russia
4	Novosibirsk State Technical University, Novosibirsk, Russia
5	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, Koltsovo, Russia
6	Department of Physics, Saint Petersburg State University, St. Petersburg, Russia

Funding (3)

1	Ministry of Science and Higher Education of the Russian Federation	FSUS-2024-0020
2	Ministry of Science and Higher Education of the Russian Federation	FWUR-2024-0042
3	Russian Science Foundation	23-12-00016 (123060600015-0)

Chemical composition dependent vibrational modes of manganese-based bismuth telluride (MBT) magnetic topological insulators thin films grown by molecular beam epitaxy were studied by Raman spectroscopy and compared with the vibrational modes of Bi2Te3 films. Intensity of E3g TO mode was much stronger in Bi efficient MBT film. In contrast, vibrational cross-section of A21g LO mode was stronger in Bi deficient MBT compound. E3g TO mode corresponds to in-plane vibrations of Bi-Te atomic layers. Deficiency of Bi atoms in the MBT indicated that the vibrational degree of freedom of Bi-Te in the septuple unit cell was less probable. Antisymmetric out-of-phase vibration of Te-Te atoms resulted in A21g LO mode in which Bi atom was stationary, therefore vibrational cross-section of this mode for Bi deficient MBT film was stronger. A resonantly excited Eg and A1g modes was observed at excitation energy 1.57 eV associated to deformation potential and Frohlich electron–phonon coupling, respectively

Kumar N. , Ishchenko D. , Milekhin I. , Kyrova E. , Fedosenko E. , Milekhin A. , Tereshchenko O.
Chemical Composition Dependent Raman Scattering Spectroscopy of MBE Grown Manganese ‐ Based Bismuth Telluride Topological Insulator Thin Films
Journal of Raman Spectroscopy. 2025. V.56. N5. P.409-419. DOI: 10.1002/jrs.6779 WOS Scopus OpenAlex publication_identifier_short.sciact_skif_identifier_type

Submitted:	Nov 18, 2024
Accepted:	Jan 24, 2025
Published print:	May 1, 2025

Web of science:	WOS:001420181000001
Scopus:	2-s2.0-105002488804
OpenAlex:	W4407499247
publication_identifier.sciact_skif_identifier_type:	3698

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