Universität zu Köln

Soranzio, Davide, Savoini, Matteo, Beaud, Paul, Cilento, Federico, Boie, Larissa ORCID: 0000-0002-1991-3980, Doessegger, Janine, Ovuka, Vladimir, Houver, Sarah ORCID: 0000-0002-2121-0889, Sander, Mathias, Zerdane, Serhane, Abreu, Elsa, Deng, Yunpei, Mankowsky, Roman, Lemke, Henrik T., Parmigiani, Fulvio, Peressi, Maria and Johnson, Steven L. (2022). Strong modulation of carrier effective mass in WTe2 via coherent lattice manipulation. npj 2D Mater. Appl., 6 (1). BERLIN: NATURE PORTFOLIO. ISSN 2397-7132

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Abstract

The layered transition-metal dichalcogenide WTe2 is characterized by distinctive transport and topological properties. These properties are largely determined by electronic states close to the Fermi level, specifically to electron and hole pockets in the Fermi sea. In principle, these states can be manipulated by changes to the crystal structure. The precise impact of particular structural changes on the electronic properties is a strong function of the specific nature of the atomic displacements. Here, we report on time-resolved X-ray diffraction and infrared reflectivity measurements of the coherent structural dynamics in WTe2 induced by femtosecond laser pulses excitation (central wavelength 800 nm), with emphasis on a quantitative description of both in-plane and out-of-plane vibrational modes. We estimate the magnitude of these motions, and calculate via density functional theory their effect on the electronic structure. Based on these results, we predict that phonons periodically modulate the effective mass of carriers in the electron and hole pockets up to 20%. This work opens up new opportunities for modulating the peculiar transport properties of WTe2 on short time scales.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Soranzio, Davide UNSPECIFIED UNSPECIFIED UNSPECIFIED Savoini, Matteo UNSPECIFIED UNSPECIFIED UNSPECIFIED Beaud, Paul UNSPECIFIED UNSPECIFIED UNSPECIFIED Cilento, Federico UNSPECIFIED UNSPECIFIED UNSPECIFIED Boie, Larissa UNSPECIFIED orcid.org/0000-0002-1991-3980 UNSPECIFIED Doessegger, Janine UNSPECIFIED UNSPECIFIED UNSPECIFIED Ovuka, Vladimir UNSPECIFIED UNSPECIFIED UNSPECIFIED Houver, Sarah UNSPECIFIED orcid.org/0000-0002-2121-0889 UNSPECIFIED Sander, Mathias UNSPECIFIED UNSPECIFIED UNSPECIFIED Zerdane, Serhane UNSPECIFIED UNSPECIFIED UNSPECIFIED Abreu, Elsa UNSPECIFIED UNSPECIFIED UNSPECIFIED Deng, Yunpei UNSPECIFIED UNSPECIFIED UNSPECIFIED Mankowsky, Roman UNSPECIFIED UNSPECIFIED UNSPECIFIED Lemke, Henrik T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, Fulvio UNSPECIFIED UNSPECIFIED UNSPECIFIED Peressi, Maria UNSPECIFIED UNSPECIFIED UNSPECIFIED Johnson, Steven L. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-687833
DOI:	10.1038/s41699-022-00347-z
Journal or Publication Title:	npj 2D Mater. Appl.
Volume:	6
Number:	1
Date:	2022
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2397-7132
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGNETORESISTANCE Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68783