Effect of local inhomogeneity on nucleation: case of CDW depinning

Effects of spatial inhomogeneities on the nucleation process are studied theoretically by considering the case of the depinning of charge density waves (CDWs) as a typical example. In this case a nucleation is defined as the local appearance of the moving state in the pinned state. The depinning fie...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2000-07, Vol.284, p.1667-1668
Main Authors: Yumoto, Masanori, Fukuyama, Hidetoshi, Matsukawa, Hiroshi, Nagaosa, Naoto
Format: Article
Language:English
Subjects:
Charge density wave
Depinning
Inhomogeneity
Nucleation
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Summary:Effects of spatial inhomogeneities on the nucleation process are studied theoretically by considering the case of the depinning of charge density waves (CDWs) as a typical example. In this case a nucleation is defined as the local appearance of the moving state in the pinned state. The depinning field of the one-dimensional (1D) commensurate CDW with one impurity is examined based on the phase Hamiltonian at absolute zero. The classical depinning field is lowered by a finite amount compared to that in the absence of the impurity. The quantum depinning in our model is also discussed. It turns out the impurity assists the quantum depinning.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(99)02836-7