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Photocurrent Imaging of Multi-Memristive Charge Density Wave Switching in Two-Dimensional 1T-TaS2

Authors :
Patel, Tarun
Okamoto, Junichi
Dekker, Tina
Yang, Bowen
Gao, Jingjing
Luo, Xuan
Lu, Wenjian
Sun, Yuping
Tsen, Adam W.
Publication Year :
2020

Abstract

Transport studies of atomically thin 1T-TaS2 have demonstrated the presence of intermediate resistance states across the nearly commensurate (NC) to commensurate (C) charge density wave (CDW) transition, which can be further switched electrically. While this presents exciting opportunities for the material in memristor applications, the switching mechanism has remained elusive and could be potentially attributed to the formation of inhomogeneous C and NC domains across the 1T-TaS2 flake. Here, we present simultaneous electrical driving and scanning photocurrent imaging of CDWs in ultrathin 1T-TaS2 using a vertical heterostructure geometry. While micron-sized CDW domains form upon changing temperature, electrically driven transitions result in largely uniform changes, indicating that states of intermediate resistance for the latter likely correspond to true metastable CDW states in between the NC and C phases, which we then explain by a free energy analysis. Additionally, we are able to perform repeatable and bidirectional switching across the multiple CDW states without changing sample temperature, demonstrating that atomically thin 1T-TaS2 can be further used as a robust and reversible multi-memristor material.<br />Comment: This is a preprint of an article accepted for publication in Nano Letters(2020)

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2009.10179
Document Type :
Working Paper
Full Text :
https://doi.org/10.1021/acs.nanolett.0c02537