Universität zu Köln

Falke, Y., Ehlen, N., Marini, G., Fedorov, A., V, Voroshnin, V. Y., Senkovskiy, B., V, Nikonov, K., Hoesch, M., Kim, T. K., Petaccia, L., Di Santo, G., Szkopek, T., Profeta, G. and Grueneis, A. (2021). Coupling to zone-center optical phonons in VSe2 enhanced by charge density waves. Phys. Rev. B, 104 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We investigate electron-phonon coupling (EPC) in the charge density wave (CDW) phase of VSe2 by Raman spectroscopy, angle-resolved photoemission spectroscopy (ARPES), and ab initio calculations. Zone folding induced by the 4 x 4 in-plane CDW phase promotes the appearance of a Raman peak at similar to 170 cm-1. The suppression of ARPES intensity in parts of the Fermi surface is also a result of CDW-induced zone folding and anticrossing of the electron energy bands. The appearance of the new Raman peak is in line with the ARPES observation of a kink feature in the spectral function at the same energy. A self-energy analysis yields an EPC constant of lambda = 0.3. Our calculations of the EPC are in excellent agreement and reveal that the kink is caused by several optical phonon branches close in energy. Our paper highlights the CDW phase as a means of inducing EPC pathways to optical phonons that directly affect its Raman spectrum.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Falke, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ehlen, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Marini, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedorov, A., V UNSPECIFIED UNSPECIFIED UNSPECIFIED Voroshnin, V. Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, B., V UNSPECIFIED UNSPECIFIED UNSPECIFIED Nikonov, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hoesch, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, T. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petaccia, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Di Santo, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Szkopek, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Profeta, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueneis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-598869
DOI:	10.1103/PhysRevB.104.235137
Journal or Publication Title:	Phys. Rev. B
Volume:	104
Number:	23
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language 1T-VSE2; LAYER Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59886