非平衡物理学グループセミナー 2008

3月 6日(木) 15:00-

発表者
Serguei Brazovskii (所属:Universite Paris-Sud/CNRS)


題目(title)
New Routes to Solitons in Quasi 1D Conductors

概要(abstract)
We collect experimental and theoretical evidences on existence of microscopic solitons, 
and their determining role in electronic processes of quasi-1D conductors, see 
arXiv:0801.3202 and rfs. therein. The recent interest rises from a discovery of the 
ferroelectric charge ordering in organic conductors, and from nano-scale tunneling 
experiments in Charge Density Wave (CDW) materials. The charge ordering allows to 
observe several types of solitons in conductivity and permittivity, and solitons' 
bound pairs in optics - both in insulating and conducting cases, in a fruitful 
comparison with conducting polymers. Internal tunneling in CDWs goes through the 
channel of “amplitude solitons”, which correspond to the long sought 
quasi-particle - the spinon. The same experiment gives an access to the reversible 
reconstruction of the junction via spontaneous creation of a lattice of 2π 
solitons - a grid of dislocations. Individual 2π solitons have been visually 
captured in recent STM experiments. The resolved subgap tunneling recovers collective 
quantum processes - instantons, which study provides a tool for the corresponding 
theory. The theory relies upon a regime of quantum dissipation provided by soft mode 
emittance in the course of the soliton creation. 



場所
京都大学基礎物理学研究所 研究棟・講義室K206
地図 (Map)

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