Dimensional crossover of soliton transport in TaS3 nanocrystals
Dimensional crossover of soliton transport in TaS3 nanocrystals
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TaS3 纳米晶中孤子输运的维度交叉
DOI：
10.1016/j.jpcs.2005.05.058
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发表时间：
2005
影响因子：
4
通讯作者：
S. Tanda
中科院分区：
文献类型：
--
作者：
K. Inagaki;T. Toshima;S. Tanda
样本量的减少通过系统维度的变化导致新的现象。纳米技术的进步使我们可以寻求这种尺寸驱动效应的准一维材料。在这里，我们报告最近的研究o-TaS 3纳米晶体。我们发现，由于孤子输运的电荷密度波系统的非线性导电变得独立的温度低于2K。观察到的I-V曲线可分为两类。一种样品显示标准活化公式I exp[−E0/E2]，而另一种样品显示修改形式I exp[−（E0/E）2]，其中E0是常数，E是外加场。由于两种样品在同一批次中合成，因此将I-V曲线的差异归因于样品量的差异是合理的。在Hatakenaka等人提出的理论框架下，我们将其解释为孤子输运的维度交叉。他们预言解的量子成核可能性Γ，它与电流成正比，服从一个依赖于维度的公式，即Γ_exp（const./艾德），其中D是系统维度。据此，我们的观察表明，与孤子输运相关的系统尺寸是D=1或D=2，这取决于系统的大小。
Reduction of the sample size leads to a new phenomena through a change in system dimensionality. Progress of nanotechnology allows us to seek for such a size-driven effect of quasi-one-dimensional materials. Here we report recent studies of o-TaS3nanocrystals. We found that the nonlinear conduction due to soliton transport in the charge-density-wave system became independent of temperature below 2K. The observed I-V curves were classified to two kinds. One kind of the samples exhibit the standard activation formula, I∝ exp[−E0/E2], whereas other kind of the samples show a modified form, I ∝ exp[−(E0/E)2], where E0is a constant, and E is an applied field. Since both kinds of the samples were synthesized in a same batch, it is plausible to attribute the difference of the I–V curves to that of the sample sizes. We interpreted it as the dimensional crossover of soliton transport, in the framework provided by Hatakenaka et al. They predicted the quantum nucleation possibility of the solutions Γ, which is proportional to the current, obeys a dimensionality-dependent formula, Γ ∝ exp(const./ED), where D is the system dimension. According to this, our observation suggests that the system dimension relevant to soliton transport was either D=1 or D=2, which depends on the system size.