Observation of charge density waves in free-standing 1T-TaSe2 monolayers by transmission electron microscopy

P. C. Börner; M. K. Kinyanjui; T. Björkman; T. Lehnert; A. V. Krasheninnikov; U. Kaiser

doi:10.1063/1.5052722

Observation of charge density waves in free-standing 1T-TaSe₂ monolayers by transmission electron microscopy

P. C. Börner
, M. K. Kinyanjui
, T. Björkman
, T. Lehnert
, A. V. Krasheninnikov
, U. Kaiser

Teknillisen fysiikan laitos

Ulm University
Åbo Akademi University
Institute of Resource Ecology

Tutkimustuotos: Lehtiartikkeli › Article › Scientific › vertaisarvioitu

25 Sitaatiot (Scopus)

319 Lataukset (Pure)

Abstrakti

While bulk 1T-TaSe₂ is characterized by a commensurate charge density wave (CCDW) state below 473 K, the stability of the CCDW state in a 1T-TaSe₂ monolayer, although theoretically predicted, has not been experimentally confirmed so far. As charge density waves and periodic lattice distortions (PLDs) always come together, we evaluate the PLD in a 1T-TaSe₂ monolayer from low-voltage aberration-corrected high-resolution transmission electron microscopy experiments. To prevent fast degradation of 1T-TaSe₂ during exposure to the electron-beam, a 1T-TaSe₂/graphene heterostructure was prepared. We also perform the image simulations based on atom coordinates obtained using density functional theory calculations. From the agreement between the experimental and simulated images, we confirm the stability of the CCDW/PLD in a monolayer 1T-TaSe₂/graphene heterostructure at room temperature in the form of a 13 × 13 superstructure. At the same time, we find that in comparison to multi-layer structures, the superstructure is less pronounced.

Alkuperäiskieli	Englanti
Artikkeli	173103
Sivut	1-4
Julkaisu	Applied Physics Letters
Vuosikerta	113
Numero	17
DOI - pysyväislinkit	https://doi.org/10.1063/1.5052722
Tila	Julkaistu - 22 lokak. 2018
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Rahoitus

The authors acknowledge the financial support from the German research foundation (DFG) and the Ministry of Science, Research and the Arts (MWK) of Baden-Wurttemberg in the frame of the “SALVE” (Sub Angstrom Low-Voltage Electron microscopy) project and project KR 4866 and from the EU in the frame of the Graphene Flagship. A.V.K. also thanks the Akademy of Finland for the support under Project No. 286279. We thank CSC Finland and PRACE (HLRS, Stuttgart, Germany) for generous grants of CPU time.

Pääsy asiakirjaan

10.1063/1.5052722

1.5052722Final published version, 1,55 MB

Muut tiedostot ja linkit

Link to publication in Scopus

Siteeraa tätä

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title = "Observation of charge density waves in free-standing 1T-TaSe2 monolayers by transmission electron microscopy",

abstract = "While bulk 1T-TaSe2 is characterized by a commensurate charge density wave (CCDW) state below 473 K, the stability of the CCDW state in a 1T-TaSe2 monolayer, although theoretically predicted, has not been experimentally confirmed so far. As charge density waves and periodic lattice distortions (PLDs) always come together, we evaluate the PLD in a 1T-TaSe2 monolayer from low-voltage aberration-corrected high-resolution transmission electron microscopy experiments. To prevent fast degradation of 1T-TaSe2 during exposure to the electron-beam, a 1T-TaSe2/graphene heterostructure was prepared. We also perform the image simulations based on atom coordinates obtained using density functional theory calculations. From the agreement between the experimental and simulated images, we confirm the stability of the CCDW/PLD in a monolayer 1T-TaSe2/graphene heterostructure at room temperature in the form of a 13 × 13 superstructure. At the same time, we find that in comparison to multi-layer structures, the superstructure is less pronounced.",

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T1 - Observation of charge density waves in free-standing 1T-TaSe2 monolayers by transmission electron microscopy

AU - Börner, P. C.

AU - Kinyanjui, M. K.

AU - Björkman, T.

AU - Lehnert, T.

AU - Krasheninnikov, A. V.

AU - Kaiser, U.

PY - 2018/10/22

Y1 - 2018/10/22

N2 - While bulk 1T-TaSe2 is characterized by a commensurate charge density wave (CCDW) state below 473 K, the stability of the CCDW state in a 1T-TaSe2 monolayer, although theoretically predicted, has not been experimentally confirmed so far. As charge density waves and periodic lattice distortions (PLDs) always come together, we evaluate the PLD in a 1T-TaSe2 monolayer from low-voltage aberration-corrected high-resolution transmission electron microscopy experiments. To prevent fast degradation of 1T-TaSe2 during exposure to the electron-beam, a 1T-TaSe2/graphene heterostructure was prepared. We also perform the image simulations based on atom coordinates obtained using density functional theory calculations. From the agreement between the experimental and simulated images, we confirm the stability of the CCDW/PLD in a monolayer 1T-TaSe2/graphene heterostructure at room temperature in the form of a 13 × 13 superstructure. At the same time, we find that in comparison to multi-layer structures, the superstructure is less pronounced.

AB - While bulk 1T-TaSe2 is characterized by a commensurate charge density wave (CCDW) state below 473 K, the stability of the CCDW state in a 1T-TaSe2 monolayer, although theoretically predicted, has not been experimentally confirmed so far. As charge density waves and periodic lattice distortions (PLDs) always come together, we evaluate the PLD in a 1T-TaSe2 monolayer from low-voltage aberration-corrected high-resolution transmission electron microscopy experiments. To prevent fast degradation of 1T-TaSe2 during exposure to the electron-beam, a 1T-TaSe2/graphene heterostructure was prepared. We also perform the image simulations based on atom coordinates obtained using density functional theory calculations. From the agreement between the experimental and simulated images, we confirm the stability of the CCDW/PLD in a monolayer 1T-TaSe2/graphene heterostructure at room temperature in the form of a 13 × 13 superstructure. At the same time, we find that in comparison to multi-layer structures, the superstructure is less pronounced.

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