Miller John H, Wijesinghe Asanga I
Department of Physics & Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77204-5005 USA.
Physica B Condens Matter. 2012 Jun 1;407(11):1734-1736. doi: 10.1016/j.physb.2012.01.018.
We report on new developments in the quantum picture of correlated electron transport in charge and spin density waves. The model treats the condensate as a quantum fluid in which charge soliton domain wall pairs nucleate above a Coulomb blockade threshold field. We employ a time-correlated soliton tunneling model, analogous to the theory of time-correlated single electron tunneling, to interpret the voltage oscillations and nonlinear current-voltage characteristics above threshold. An inverse scaling relationship between threshold field and dielectric response, originally proposed by Grüner, emerges naturally from the model. Flat dielectric and other ac responses below threshold in NbSe(3) and TaS(3), as well as small density wave phase displacements, indicate that the measured threshold is often much smaller than the classical depinning field. In some materials, the existence of two distinct threshold fields suggests that both soliton nucleation and classical depinning may occur. In our model, the ratio of electrostatic charging to pinning energy helps determine whether soliton nucleation or classical depinning dominates.
我们报告了电荷和自旋密度波中关联电子输运量子图景的新进展。该模型将凝聚态视为一种量子流体，其中电荷孤子畴壁对在库仑阻塞阈值场之上成核。我们采用一种与时间关联单电子隧穿理论类似的时间关联孤子隧穿模型，来解释阈值以上的电压振荡和非线性电流 - 电压特性。最初由格鲁纳提出的阈值场与介电响应之间的反比缩放关系，自然地从该模型中出现。在NbSe(3)和TaS(3)中低于阈值的平坦介电和其他交流响应，以及小的密度波相位位移，表明所测量的阈值通常远小于经典的脱钉场。在一些材料中，两个不同阈值场的存在表明孤子成核和经典脱钉都可能发生。在我们的模型中，静电荷与钉扎能量的比值有助于确定是孤子成核还是经典脱钉起主导作用。
