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Torsional Instability in The Single Chain Limit of A Transition Metal Trichalcogenide
Creation of isolated chains of NbSe3 with structural torsional waves not found in bulk crystals.
Significance and Impact
Versatile method developed to isolate single chains of 1-D van der Waals materials, and observation of Charge-Induced Torsional Waves (CTWs) in the single and few-chain limit that may find optical applications.
- Synthesized the quasi-one-dimensional transition metal trichalcogenide NbSe3 (niobium triselenide) in the few-chain limit, including the realization of the isolated single chains .
- Observed the static and dynamic structural torsional waves not found in bulk NbSe3 crystals by aberration-corrected TEM.
- Electronic structure calculation by DFT showed that the charge transfer drives the torsional wave instability, and ultra weak bonding between the chains and the nanotube sheath allows unhindered chain dynamics.
T. Pham, S. Oh, P. Stetz, S. Onishi, C. F. Kisielowski, M. L. Cohen, A. Zettl, Science 361, 263-266 (2018)