Encoding multistate charge order and chirality in endotaxial heterostructures

Samra Husremović, Berit H. Goodge, Matthew P. Erodici, Katherine Inzani, Alberto Mier, Stephanie M. Ribet, Karen C. Bustillo, Takashi Taniguchi, Kenji Watanabe, Colin Ophus, Sinéad M. Griffin and D. Kwabena Bediako ()
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Samra Husremović: University of California
Berit H. Goodge: University of California
Matthew P. Erodici: University of California
Katherine Inzani: University of Nottingham, University Park
Alberto Mier: University of California
Stephanie M. Ribet: Lawrence Berkeley National Laboratory
Karen C. Bustillo: Lawrence Berkeley National Laboratory
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Colin Ophus: Lawrence Berkeley National Laboratory
Sinéad M. Griffin: Lawrence Berkeley National Laboratory
D. Kwabena Bediako: University of California

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract High-density phase change memory (PCM) storage is proposed for materials with multiple intermediate resistance states, which have been observed in 1T-TaS2 due to charge density wave (CDW) phase transitions. However, the metastability responsible for this behavior makes the presence of multistate switching unpredictable in TaS2 devices. Here, we demonstrate the fabrication of nanothick verti-lateral H-TaS2/1T-TaS2 heterostructures in which the number of endotaxial metallic H-TaS2 monolayers dictates the number of resistance transitions in 1T-TaS2 lamellae near room temperature. Further, we also observe optically active heterochirality in the CDW superlattice structure, which is modulated in concert with the resistivity steps, and we show how strain engineering can be used to nucleate these polytype conversions. This work positions the principle of endotaxial heterostructures as a promising conceptual framework for reliable, non-volatile, and multi-level switching of structure, chirality, and resistance.

Date: 2023
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DOI: 10.1038/s41467-023-41780-y

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