Volume 109, Number 2, January 2015
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 February 2015|
Charge density wave soliton liquid
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 Department of Physics, Asahikawa Medical University - Asahikawa 078-8510, Japan
4 Division of Quantum Science and Engineering, Hokkaido University - Sapporo 060-8628, Japan
Received: 10 September 2014
Accepted: 13 January 2015
We investigate the charge density wave transport in a quasi–one-dimensional conductor, orthorhombic tantalum trisulfide (o-TaS3), by applying a radio-frequency ac voltage. We find a new ac-dc interference spectrum in the differential conductance, which appears on both sides of the zero-bias peak. The frequency and amplitude dependences of the new spectrum do not correspond to those of any usual ac-dc interference spectrum (Shapiro steps). The results suggest that CDW phase dynamics has a hidden degree of freedom. We propose a model in which phase solitons behave as liquid. The origin of the new spectrum is that the solitons are depinned from impurity potentials assisted by an ac field when a small dc field is applied. Our results provide a new insight as regards our understanding of an elementary process in CDW dynamics.
PACS: 71.45.Lr – Charge-density-wave systems / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 05.45.Yv – Solitons
© EPLA, 2015
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