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arXiv:2212.13376 (cond-mat)
[Submitted on 27 Dec 2022]

Title:Scanning tunneling microscopy study of hidden phases in atomically thin 1T-TaS$_2$

Authors:Wooin Yang, Dowook Kim, Hyoung Kug Kim, Tae-Hwan Kim
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Abstract:Lower thermal stability due to thinning often leads to unprecedented hidden phases in low-dimensional materials. Such hidden phases can coexist or compete with preexisting electronic phases. We investigate hidden phases observed in atomically thin (6-8 layers) 1T-TaS$_2$ with scanning tunneling microscopy. First, we can electrically induce a hidden stripe phase at room temperature. Such a uniaxial stripe phase has three equivalent orientations by breaking three-fold symmetry of 1T-TaS$_2$. We also reveal that the hidden stripe phase coexists with nearly commensurate charge-density-wave phase. Next, we observe that the emergent stripe phase spontaneously appears without any electric excitation on a tiny flake ($160\times80$ nm$^2$). Our findings may provide a plausible explanation for the previously observed phase transition and two-fold optical response in thin 1T-TaS$_2$ devices at room temperature. Furthermore, the hidden stripe phase would be crucial to understand exotic CDW-related phenomena in 1T-TaS$_2$ for potential applications.
Comments: 6 pages, 5 figures
Subjects: Materials Science (cond-mat.mtrl-sci); Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:2212.13376 [cond-mat.mtrl-sci]
  (or arXiv:2212.13376v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.2212.13376
Journal reference: Journal of the Korean Physical Society 82, 298-304 (2023)
Related DOI: https://doi.org/10.1007/s40042-023-00705-0

Submission history

From: Tae-Hwan Kim [view email]
[v1] Tue, 27 Dec 2022 06:37:49 UTC (3,648 KB)
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