| Issue |
EPL
Volume 112, Number 2, October 2015
|
|
|---|---|---|
| Article Number | 27005 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/112/27005 | |
| Published online | 16 November 2015 | |
Single-valuedness problem on charge density wave rings
1 Department of Applied Physics, Hokkaido University - Sapporo 060-8628, Japan.
2 Center of Education and Research for Topological Science and Technology, Hokkaido University Sapporo 060-8628, Japan
3 Division of Quantum Science and Engineering, Hokkaido University - Sapporo 060-8628, Japan
Received: 20 June 2015
Accepted: 20 October 2015
We investigate the bimodal fluctuation of charge density wave (CDW) current through ring-shaped crystals (typical diameter is a few ten 
) of orthorhombic tantalum trisulfide 
. We find that the CDW current changes between two types of the bimodal fluctuation, and exhibits hysteretic behavior as a function of the dc voltage. The hysteresis of the fluctuation modes suggests that the CDW rings involve several metastable sliding states, which might be a manifestation of single-valuedness of the CDW phase field with a strong periodic boundary condition of the ring geometry.
PACS: 71.45.Lr – Charge-density-wave systems / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 03.65.Vf – Phases: geometric; dynamic or topological
© EPLA, 2015
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