Volume 97, Number 5, March 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||05 March 2012|
Aharonov-Bohm effect in charge-density wave loops with inherent temporal current switching
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
Accepted: 7 February 2012
We report evidence for Aharonov-Bohm (AB) oscillations with temporal current switching at 5.1 and 79 K by using charge-density wave (CDW) loops in TaS3 ring crystals. The periodicity of the AB oscillations is h/2e, and this is confirmed by employing four samples with different diameters. This means that sliding CDWs carry 2e charge quanta. We observe current switching between the two states, namely the high and low current states, as a result of the separation of field-dependent and time-dependent fluctuations. The probability distribution of the switching oscillates also with a period of h/2e. We discover that the observed oscillations, which are a superposition of the current fluctuations and the switching behavior, have a period h/2e.
PACS: 71.45.Lr – Charge-density-wave systems / 73.23.-b – Electronic transport in mesoscopic systems / 03.65.Vf – Phases: geometric; dynamic or topological
© EPLA, 2012
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