Thursday, February 21, 2008, 1:30 pm — Small Seminar Room, Bldg. 510
We have observed [1,2] a novel switching transition to highly conducting state in conducting polymer (Polypyrrole) nanowires. The threshold voltage (current) of the observed transition can be easily tuned by changing diameter of nanowires [3] and/or temperature. Negative differential resistance, enhancement of noise above the threshold and several other similarities with sliding motion of charge density wave (CDW) observed in structurally ordered systems. We shall discuss all these results that give evidence in favor of Wigner crystallization in these nanowires. Electron crystallization due to Coulomb repulsion is expected [4] to be different here due to random localization as compare to the original free-to-move scenario considered by Wigner [5].
References:
1. Rahman, A. and Sanyal, M.K., Adv. Mater. 19, 3956 (2007).
2. Rahman, A., Sanyal, M. K., Phys. Rev. B 76, 045110 (2007).
3. Rahman, A., Sanyal, M. K., Gangopadhayy, R., De, A., Chem. Phys. Lett. 447, 268 (2007).
4. Slutskin, A. A., Pepper, M. and Kovtun, H. A., Europhys. Lett. 62, 705 (2003)
5. Wigner E., Trans. Faraday Soc. 34, 678 (1938)
Hosted by: Doon Gibbs
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