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