Impurity Effects on Quantum Depinning of Commensurate Charge Density Waves

Details Impurity Effects on Quantum Depinning of Commensurate Charge Density Waves Impurity Effects on Quantum Depinning of Commensurate Charge Density Waves

2000-05-12

arxiv.org/abs/cond-mat/0005208v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

14 pages with 13 figures. Submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.69.2953

We investigate quantum depinning of the one-dimensional (1D) commensurate charge-density wave (CDW) in the presence of one impurity theoretically. Quantum tunneling rate below but close to the threshold field is calculated at absolute zero temperature by use of the phase Hamiltonian within the WKB approximation. We show that the impurity can induce localized fluctuation and enhance the quantum depinning. The electric field dependence of the tunneling rate in the presence of the impurity is different from that in its absence.

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